Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Credit Facility Covenant [Axis] Credit Facility Covenant [Axis] Credit Facility Covenant [Axis] Credit Facility Covenant [Domain] Credit Facility Covenant [Domain] [Domain] for Credit Facility Covenant [Axis] Market Spread [Axis] Market Spread [Axis] Market Spread [Axis] Market Spread [Domain] Market Spread [Domain] Market Spread [Domain] Interest Rate, Type [Axis] Interest Rate, Type [Axis] Interest Rate, Type [Axis] Interest Rate, Type [Domain] Interest Rate, Type [Domain] Interest Rate, Type [Domain] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Revolving Credit Facility [Member] Revolving Credit Facility [Member] Notes Payable, Other Payables [Member] Notes Payable, Other Payables [Member] Stock Issued During Period [Axis] Stock Issued During Period [Axis] Stock Issued During Period [Axis] Stock Issued During Period [Domain] Stock Issued During Period [Domain] Stock Issued During Period [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Long-term Debt Long-term Debt Line of Credit Facility, Amount Outstanding Long-term Line of Credit Interest Costs Incurred Interest Costs Incurred Interest Costs Capitalized Interest Costs Capitalized Debt, Weighted Average Interest Rate Debt, Weighted Average Interest Rate Letters of Credit Outstanding, Amount Letters of Credit Outstanding, Amount Line of Credit Facility, Current Borrowing Capacity Debt Instrument, Unused Borrowing Capacity, Amount Long-term Debt, Fair Value Long-term Debt, Fair Value Notes Payable, Current Notes Payable, Current Share-based Compensation [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 2013 Board of Director Stock [Member] 2013 Board of Director Stock [Member] 2013 Board of Director Stock [Member] 2012 Board of Director Stock [Member] Board of Director Stock [Member] Board of Director Stock [Member] 2014 Board of Director Stock [Member] 2014 Board of Director Stock [Member] [Member] 2014 Board of Director Stock [Member] [Member] 2010 LTI Grant [Member] 2010 LTI Grant [Member] 2010 LTI Grant [Member] 2011 LTI Grant [Member] 2011 LTI Grant [Member] 2011 LTI Grant [Member] 2012 Performance Grant [Member] 2012 Performance Grant [Member] 2012 Performance Grant [Member] 2013 Long Term Incentive Plan [Member] 2013 Long Term Incentive Plan [Member] 2013 Long Term Incentive Plan [Member] 2014 Long Term Incentive Plan [Member] 2014 Long Term Incentive Plan [Member] 2014 Long Term Incentive Plan [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Stock Options Outstanding, Weighted Average Remaining Contractual Term Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Allocated Share-based Compensation Expense Allocated Share-based Compensation Expense Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Nonvested shares outstanding at Period Start, Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted, Number of Shares Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Vested, Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Nonvested shares outstanding at Period End, Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Nonvested shares outstanding at Period Start, Weighted Average Grant Date Fair Value Per Share Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted, Weighted Average Grant Date Fair Value Per Share Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Vested, Weighted Average Grant Date Fair Value Per Share (dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Nonvested shares outstanding at Period End, Weighted Average Grant Date Fair Value Per Share Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Disclosure [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Inventory Disclosure [Abstract] Inventory Inventory Disclosure [Text Block] Long-term Purchase Commitment [Table] Long-term Purchase Commitment [Table] Category of Item Purchased [Axis] Category of Item Purchased [Axis] Long-term Purchase Commitment, Category of Item Purchased [Domain] Long-term Purchase Commitment, Category of Item Purchased [Domain] Long-term Purchase Commitment [Line Items] Long-term Purchase Commitment [Line Items] Income Tax Disclosure [Abstract] Income Tax Disclosure [Text Block] Income Tax Disclosure [Text Block] Subsequent Events [Abstract] Subsequent Events [Text Block] Subsequent Events [Text Block] Subsequent Event [Abstract] Subsequent Event [Abstract] SEGMENT INFORMATION [Abstract] SEGMENT INFORMATION [Abstract] Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table Text Block] Reconciliation of Assets from Segment to Consolidated [Table Text Block] Reconciliation of Assets from Segment to Consolidated [Table Text Block] Business Combinations [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Segments [Axis] Segments [Axis] Segment [Domain] Segments [Domain] Environmental Services Segment [Member] Environmental Services Segment [Member] Environmental Services Segment [Member] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] RFTI [Member] RFTI [Member] RFTI [Member] RTI [Member] RTI [Member] RTI [Member] UL-NT/RS [Member] UL-NT/RS [Member] Universal Lubricants - Northern Territory - RS Used Oil Services Sav-Tech [Member] Sav-Tech [Member] Sav-Tech [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Payments to Acquire Businesses, Gross Payments to Acquire Businesses, Gross Goodwill, Purchase Accounting Adjustments Goodwill, Purchase Accounting Adjustments Issuance of common stock - Acquisition Stock Issued During Period, Value, Acquisitions Stock Issued During Period, Shares, Acquisitions Stock Issued During Period, Shares, Acquisitions Accounts Receivable, Net Accounts Receivable, Net Other current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other Inventory Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory Property, Plant, & Equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Intangible Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Goodwill Goodwill Goodwill, Acquired During Period Goodwill, Acquired During Period Accounts Payable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable Accrued expenses Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other Business Acquisition Purchase Price Net of Cash Acquired Business Acquisition Purchase Price Net of Cash Acquired The total cost of the acquired entity less cash recevied upon the purchase. Less: common stock issued Business Acquisition, Equity Interest Issued or Issuable, Value Assigned Less: note issued Debt Instrument, Face Amount Less: working capital adjustment Working Capital Adjustment Adjustment to the cash paid for an acquisition based on changes in working capital at the acquiree. Net cash paid Business Acquisition - Cash Paid Net of Cash Acquired Business Acquisition - Cash Paid Net of Cash Acquired Total Revenues Business Acquisition, Pro Forma Revenue Net Income Business Acquisition, Pro Forma Net Income (Loss) Basic Business Acquisition, Pro Forma Earnings Per Share, Basic Diluted Business Acquisition, Pro Forma Earnings Per Share, Diluted Consolidated Statement Stockholders' Equity [Abstract] Consolidated Statement Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Common Stock [Member] Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Retained Earnings [Member] Retained Earnings [Member] Total Heritage-Crystal Clean, Inc. Stockholders' Equity [Member] Parent [Member] Noncontrolling Interest [Member] Noncontrolling Interest [Member] Statement [Line Items] Statement [Line Items] Shares Common Stock, Shares, Outstanding Par Value Common Common Stock, Value, Issued Additional Paid-in Capital Additional Paid in Capital Retained earnings Retained Earnings (Accumulated Deficit) Total Heritage-Crystal Clean, Inc. Stockholders' Equity Stockholders' Equity Attributable to Parent Noncontrolling Interest Stockholders' Equity Attributable to Noncontrolling Interest Total Equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Net Income Attributable to Parent Net Income (Loss) Attributable to Parent Net Income attributable to Heritage-Crystal Clean, Inc. common shareholders Net Income (Loss) Available to Common Stockholders, Basic Income attributable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Net Income, Including Portion Attributable to Noncontrolling Interest Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Distribution Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Issuance of common stock - Acquisition Issuance of common stock - ESPP Stock Issued During Period, Shares, Employee Stock Purchase Plans Issuance of common stock - ESPP Stock Issued During Period, Value, Employee Stock Purchase Plan Exercise of stock options Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Share-based compensation Share-based compensation Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Accounts Receivable [Abstract] Accounts Receivable [Abstract] Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Statement of Financial Position [Abstract] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] ASSETS Assets [Abstract] Current Assets: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accounts receivable - net Accounts Receivable, Net, Current Inventory - net Inventory, Net Deferred income taxes Deferred Tax Assets, Net of Valuation Allowance, Current Other current assets Other Assets, Current Total Current Assets Assets, Current Property, plant and equipment - net Property, Plant and Equipment, Net Equipment at customers - net Property, Plant and Equipment, Other, Net Software and intangible assets - net Intangible Assets, Net (Excluding Goodwill) Total Assets Assets LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity [Abstract] Current Liabilities: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Current maturities of long-term debt and term loan Long-term Debt, Current Maturities Accrued salaries, wages, and benefits Employee-related Liabilities, Current Taxes payable Taxes Payable, Current Other accrued expenses Other Liabilities, Current Total Current Liabilities Liabilities, Current Term loan, less current maturities Long-term Debt, Excluding Current Maturities Long-term debt, less current maturities Notes Payable, Noncurrent Deferred income taxes Deferred Tax Liabilities, Net, Noncurrent Total Liabilities Liabilities STOCKHOLDERS' EQUITY: Stockholders' Equity Attributable to Parent [Abstract] Common stock - 26,000,000 shares authorized at $0.01 par value, 18,447,586 and 18,360,282 shares issued and outstanding at September 6, 2014 and December 28, 2013, respectively Additional paid-in capital Total Heritage-Crystal Clean, Inc. Stockholders' Equity Total Liabilities and Stockholders' Equity Liabilities and Equity Intangible Assets Disclosure [Abstract] Intangible Assets Disclosure [Abstract] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Asset Class [Axis] Asset Class [Axis] Indefinite-lived Intangible Assets, Major Class Name [Domain] Asset Class [Domain] Customer Relationships [Member] Customer Relationships [Member] Software [Member] Computer Software, Intangible Asset [Member] Patents, formulae, and licenses [Member] Patents, formulae, and licenses [Member] Patents, formulae, and licenses [Member] Noncompete Agreements [Member] Noncompete Agreements [Member] Other Intangible Assets [Member] Other Intangible Assets [Member] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Acquired Finite-Lived Intangible Assets [Line Items] Acquired Finite-Lived Intangible Assets [Line Items] Intangible Assets, Gross Intangible Assets, Gross Intangible Assets, Gross Finite-Lived Intangible Assets, Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Intangible Assets, Net (Excluding Goodwill) Amortization of Intangible Assets Amortization of Intangible Assets Finite-Lived Intangible Asset, Useful Life Finite-Lived Intangible Asset, Useful Life Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year Finite-Lived Intangible Assets, Amortization Expense, Year Two Finite-Lived Intangible Assets, Amortization Expense, Year Two Finite-Lived Intangible Assets, Amortization Expense, Year Three Finite-Lived Intangible Assets, Amortization Expense, Year Three Finite-Lived Intangible Assets, Amortization Expense, Year Four Finite-Lived Intangible Assets, Amortization Expense, Year Four Finite-Lived Intangible Assets, Amortization Expense, Year Five Finite-Lived Intangible Assets, Amortization Expense, Year Five Finite-Lived Intangible Assets, Purchase Accounting Adjustments Finite-Lived Intangible Assets, Purchase Accounting Adjustments Intangible Assets Disclosure [Text Block] Intangible Assets Disclosure [Text Block] Earnings Per Share [Abstract] Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Net income Net Income (Loss) Attributable to Noncontrolling Interest Net Income Attributable to Heritage-Crystal Clean, Inc. common stockholders Number of weighted average shares outstanding: basic Weighted Average Number of Shares Outstanding, Basic Dilutive shares for share–based compensation plans Weighted Average Number Diluted Shares Outstanding Adjustment Number of weighted average shares outstanding: diluted Weighted Average Number of Shares Outstanding, Diluted Net income per share: basic Earnings Per Share, Basic Net income per share: diluted Earnings Per Share, Diluted Quarterly Financial Information Disclosure [Abstract] Deferred Tax Nature [Axis] Deferred Tax Nature [Axis] Deferred Tax Nature [Axis] Deferred Tax Nature [Domain] Deferred Tax Nature [Domain] [Domain] for Deferred Tax Nature [Axis] Valuation Allowance by Deferred Tax Asset [Axis] Valuation Allowance by Deferred Tax Asset [Axis] Deferred Tax Asset [Domain] Deferred Tax Asset [Domain] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves [Domain] Valuation Allowances and Reserves [Domain] Operating Loss Carryforwards Operating Loss Carryforwards Addition to Net Operating Loss Addition to Net Operating Loss Addition to Net Operating Loss during the period as a result of bonus depreciation. Additional deduction from taxable income Additional deduction from taxable income Additional deduction from taxable income due to the recognition of bonus depreciation. Deferred Tax Assets, Gross Deferred Tax Assets, Gross Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Effective Income Tax Rate, Continuing Operations Effective Income Tax Rate Reconciliation, Percent Valuation Allowances and Reserves, Balance Valuation Allowances and Reserves, Balance Related Party Transactions [Abstract] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Accounting Policies [Abstract] Accounting Policies [Axis] Accounting Policies [Axis] Accounting Policies [Axis] Accounting Policies [Domain] Accounting Policies [Domain] Accounting Policies [Domain] Schedule of Expected Amortization Expense [Table Text Block] Basis of Presentation [Axis] Basis of Presentation [Axis] Basis of Presentation [Axis] Basis of Presentation [Domain] Basis of Presentation [Domain] Basis of Presentation [Domain] Balance Sheet Parenthetical [Abstract] Balance Sheet Parenthetical [Abstract] Common stock, shares authorized Common Stock, Shares Authorized Common stock, par value Common Stock, Par or Stated Value Per Share Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Schedule of Business Acquisitions, by Acquisition [Table Text Block] Schedule of Business Acquisitions, by Acquisition [Table Text Block] Business Acquisition, Pro Forma Information [Table Text Block] Business Acquisition, Pro Forma Information [Table Text Block] Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Table Text Block] Property, Plant and Equipment [Table Text Block] Short-term revolving debt Business Acquisition, Cost of Acquired Entity, Cash Paid Payments of Contingent Consideration Repayments of Contingent Consideration Repayments of Contingent Consideration Payments to Acquire Businesses, Net of Cash Acquired Payments to Acquire Businesses, Net of Cash Acquired Proceeds from Issuance of Common Stock Proceeds from Issuance of Common Stock Repayments of Long-term Debt Repayments of Long-term Debt Debt Instrument, Face Amount Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Options Outstanding Status [Axis] Options Outstanding Status [Axis] Options Outstanding Status [Axis] Options Outstanding [Domain] Options Outstanding [Domain] Options Outstanding [Domain] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Number of Options Outstanding at Period Start Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Exercised, Granted, Number of Options Outstanding Number of Options Outstanding at Period End Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Weighted Average Exercise Price of Stock Options Outstanding at Period Start (dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Exercised, Weighted Average Exercise Price of Stock Options Outstanding (dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Weighted Average Exercise Price of Stock Options Outstanding at Period End (dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Stock Options Outstanding, Aggregate Intrinsic Value as of Date Listed Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] Statement of Cash Flows [Abstract] Equity Component [Domain] Cash flows from Operating Activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Bad debt provision Provision for Doubtful Accounts Share-based Compensation Share-based Compensation Loss on Disposal of Property Plant Equipment Gain (Loss) on Disposition of Property Plant Equipment Deferred taxes Deferred Income Tax Expense (Benefit) Other, net Other Noncash Income (Expense) Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Increase in accounts receivable Increase (Decrease) in Accounts Receivable (Increase) decrease in inventory Increase (Decrease) in Inventories Increase in other current assets Increase (Decrease) in Prepaid Expense and Other Assets Increase in accounts payable Increase (Decrease) in Accounts Payable Increase in accrued expenses Increase (Decrease) in Accrued Liabilities Cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from Investing Activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Capital expenditures Payments to Acquire Property, Plant, and Equipment Business acquisitions, net of cash acquired Cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from Financing Activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from Term Loan Proceeds from Issuance of Long-term Debt Payments on Term Loan Payments of notes payable Repayments of Notes Payable Payments of Contingent Consideration Payments to Noncontrolling Interests Payments to Noncontrolling Interests Proceeds from the issuance of common stock Proceeds from the exercise of stock options Proceeds from Stock Options Exercised Cash used in financing activities Net Cash Provided by (Used in) Financing Activities Net decrease in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Supplemental disclosure of cash flow information: Supplemental Cash Flow Information [Abstract] Income taxes paid Income Taxes Paid Cash paid for interest, net of capitalized interest of $189 and $84 respectively Interest Paid Supplemental disclosure of non-cash information: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Payables for construction in process Construction in Progress Expenditures Incurred but Not yet Paid Business acquisition, note issued Notes Issued Business acquisition, common stock issued Schedule of Employee Stock Ownership Plan (ESOP) Disclosures [Table] Schedule of Employee Stock Ownership Plan (ESOP) Disclosures [Table] Employee Stock Ownership Plan (ESOP) Name [Axis] Employee Stock Ownership Plan (ESOP) Name [Axis] Employee Stock Ownership Plan (ESOP), Plan [Domain] Employee Stock Ownership Plan (ESOP), Plan [Domain] Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] Shares Available Employee Stock Purchase Plan Employee Stock Purchase Plan, Shares Available Shares Available to be issued under the Employee Stock Purchase Plan. ESPP Shares Made Available ESPP Shares Made Available Additional shares made available under the Employee Stock Purchase Plan during the period. Weighted Average Fair Value Per Share ESPP Employee Stock Purchase Plan, Weighted Average Fair Value Per Share The weighted average fair value per share of stock purchased under the Company's Employee Stock Purchase Plan during the period. Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Receivable Type [Axis] Receivable Type [Axis] Receivable Type [Domain] Receivable [Domain] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Trade Accounts Receivable, Gross, Current Less allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Current Trade - net Trade Receivables Net Receivables from customers, net of allowance for doubtful accounts. Trade - affiliates Accounts Receivable, Related Parties, Current Other Other Receivables, Net, Current Total accounts receivable - net Accounts written off, net of recoveries Accounts Written Off - net of recoveries Accounts Written Off - net of recoveries Income Tax Contingency [Table] Income Tax Contingency [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Schedule of Intangible Assets [Table Text Block] Schedule of Intangible Assets [Table Text Block] [Table Text Block] for Schedule of Intangible Assets [Table] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Depreciation Depreciation Buildings and storage tanks Buildings and storage tanks Buildings and storage tanks Machinery, vehicles and equipment (a) Machinery, vehicles and equipment Machinery, vehicles, and equipment Leasehold improvements Leasehold Improvements, Gross Land Land Construction in progress Construction in Progress, Gross Total property, plant and equipment Property, Plant and Equipment, Gross Less accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property, plant and equipment - net Equipment at customers Property, Plant and Equipment, Other, Gross Less accumulated depreciation Property, Plant and Equipment, Other, Accumulated Depreciation Equipment at customers - net Accounts Payable, Current [Abstract] Accounts Payable [Table Text Block] Accounts Payable [Table Text Block] Accounts Payable [Table Text Block] Accounts Payable [Axis] Accounts Payable [Axis] Accounts Payable [Axis] Accounts Payable [Domain] Accounts Payable [Domain] Accounts Payable [Domain] Accounts payable Accounts Payable, Trade, Current Accounts payable - related parties Accounts Payable, Related Parties, Current Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table] Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table] Nonrecurring Adjustment [Axis] Nonrecurring Adjustment [Axis] Nonrecurring Adjustment [Domain] Nonrecurring Adjustment [Domain] Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] Business Combination Disclosure [Text Block] Business Combination Disclosure [Text Block] Subsequent Event [Table] Subsequent Event [Table] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Term A Loan [Member] Term A Loan [Member] Term A Loan [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Term A-1 Loan [Member] Term A-1 Loan [Member] Term A-1 Loan [Member] FCC Environmental [Member] FCC Environmental [Member] FCC Environmental [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Line Items] Subsequent Event [Line Items] Number of locations Number of locations Number of locations Business combination purchase price Business combination purchase price Business combination purchase price Interest Coverage Ratio Interest Coverage Ratio Debt covenant, interest coverage ratio Total Leverage Ratio Total Leverage Ratio Debt covenant, total leverage ratio Capital Expenditure Limitations Capital Expenditure Limitations Debt covenant, capital expenditure limitations Re-refinery capacity Re-refinery capacity Re-refinery capacity in gallons Line of Credit Facility, Remaining Borrowing Capacity Line of Credit Facility, Remaining Borrowing Capacity Plant shutdown Plant shutdown Duration of plant shutdown in weeks. Debt Disclosure [Text Block] Debt Disclosure [Text Block] Segment Reconciling Items [Member] Segment Reconciling Items [Member] Product Revenues Sales Revenue, Goods, Net Service Revenues Sales Revenue, Services, Net Total revenues Revenue, Net Selling, general, and administrative expenses Selling, General and Administrative Expense Other expense - net Other Operating Income (Expense), Net Operating income Operating Income (Loss) Loss before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Provision for income taxes Income Tax Expense (Benefit) Basic Diluted Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Oil Business Segment [Member] Oil Business Segment [Member] Oil Business Segment [Member] Corporate and Eliminations [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Concentration Risk, Customer Concentration Risk, Customer Operating Costs Costs and Expenses Operating depreciation and amortization Cost of Goods Sold, Depreciation and Amortization Profit (Loss) Before Corporate Selling General and Administrative Expenses Profit Before Corporate Selling General and Administrative Expenses Profit Before Corporate Selling General and Administrative Expenses Depreciation and amortization from SG&A Selling General and Administrative Expenses Depreciation Selling General and Administrative Expenses Depreciation Total selling, general, and administrative expenses General and Administrative Expense Operating loss Interest expense – net Interest Expense Net Interest Expense, Net Income before income taxes Total Assets Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Earnings Per Share [Text Block] Earnings Per Share [Text Block] Document and Entity Information [Abstract] Document and Entity Information [Abstract] Entities [Table] Entities [Table] Document Information, Document [Axis] Document Information, Document [Axis] Document [Domain] Document [Domain] Document Information [Line Items] Document Information [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Employee Benefits [Abstract] Employee Benefits [Abstract] Income Statement [Abstract] Operating expenses - Operating Expenses [Abstract] Selling General and Administrative Expenses Depreciation Operating income Employee Stock Purchase Plan [Abstract] Employee Stock Purchase Plan [Abstract] Accounts Payable Disclosure [Abstract] Accounts Payable Disclosure [Abstract] Accounts Payable Accounts Payable Disclosure [Text Block] Accounts Payable Disclosure [Text Block] Use of Estimates, Policy [Policy Text Block] Use of Estimates, Policy [Policy Text Block] Revenue Recognition, Policy [Policy Text Block] Revenue Recognition, Policy [Policy Text Block] Cost of Sales, Policy [Policy Text Block] Cost of Sales, Policy [Policy Text Block] Business Combinations Policy [Policy Text Block] Business Combinations Policy [Policy Text Block] Goodwill and Intangible Assets, Policy [Policy Text Block] Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Fair Value of Financial Instruments, Policy [Policy Text Block] Fair Value of Financial Instruments, Policy [Policy Text Block] Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Fiscal Period, Policy [Policy Text Block] Fiscal Period, Policy [Policy Text Block] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Goodwill Disclosure [Abstract] Goodwill Disclosure [Abstract] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Goodwill [Line Items] Goodwill [Line Items] Goodwill, Gross Goodwill, Gross Segment Reporting Information, Profit (Loss) [Abstract] Segment Reporting Disclosure [Text Block] Segment Reporting Disclosure [Text Block] Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Purchase Commitment, Remaining Minimum Amount Committed Purchase Commitment, Remaining Minimum Amount Committed Loss Contingency Accrual, at Carrying Value Loss Contingency Accrual Inventory Components [Table] Inventory Components [Table] Inventory Types [Axis] Inventory Types [Axis] Inventory Types [Domain] Inventory Types [Domain] Inventory Types [Domain] Used oil and processed oil Oil inventory Inventory related to oil products. Solvents and solutions Solvents Inventory Solvents Inventory Machines Machines Inventory Machines Inventory Drums and supplies Drums Inventory Drums Inventory Other Other Inventory, Gross Total inventory Inventory, Gross Less: Machine refurbishing reserve Inventory Valuation Reserves Total inventory - net Schedule of Inventory, Current [Table Text Block] Schedule of Inventory, Current [Table Text Block] Property, Plant and Equipment Property, Plant and Equipment Disclosure [Text Block]