Entity Central Index Key Long-term amounts due the Company from affiliates under the terms of its agreements therewith. The liability due as of the balance sheet date for leasebacks accounted for using the financing method. Net income (loss) attributable to predecessor equity. Distributions in excess of earnings and undistributed (loss) earnings. Document and entity information. Document And Entity Information [Abstract] Document and entity information. Document and entity information. Document And Entity Information [Table] Document And Entity Information [Table] Class of Stock Statement Class Of Stock [Axis] Class of Stock Class Of Stock [Domain] Common units. Common Units Common Units [Member] Subordinated unit. Subordinated Units Subordinated Unit [Member] Document And Entity Information [Line Items] Document And Entity Information [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Fiscal Year Focus Document Fiscal Year Focus Trading Symbol Trading Symbol Document Fiscal Period Focus Document Fiscal Period Focus Entity Current Reporting Status Entity Current Reporting Status Entity Well-known Seasoned Issuer Entity Well Known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Units Outstanding Entity Common Stock Shares Outstanding Entity Public Float Entity Public Float Current amounts due the Company from affiliates under the terms of its agreements therewith. Accrued expenses and other current liabilities. Statement Of Financial Position [Abstract] Statement [Table] Statement [Table] Scenario Statement Scenario [Axis] Scenario, Unspecified Scenario Unspecified [Domain] Predecessor equity Predecessor [Member] Limited Partners' Capital Account by Class Limited Partners Capital Account By Class [Axis] Limited Partners' Capital Account, Class Limited Partners Capital Account Class [Domain] Statement [Line Items] Statement [Line Items] Assets Assets [Abstract] Current assets: Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Accounts receivable Receivables Net Current Due from affiliates Due From Affiliate Current Financing receivables - affiliate Financing Receivables Affiliates Current Inventories, net Inventory Net Prepaid expenses Prepaid Expense Current Prepaid royalties Prepaid Royalties Deferred longwall costs Deferred Costs Current Coal derivative assets Derivative Assets Current Deferred debt issuance costs Deferred Finance Costs Current Net Other current assets Other Assets Current Total current assets Assets Current Property, plant, equipment and development, net Property Plant And Equipment Net Due from affiliates Due From Affiliate Noncurrent Financing receivables - affiliate Financing Receivables Affiliates Long Term Prepaid royalties Prepaid Mineral Royalties Noncurrent Coal derivative assets Derivative Assets Noncurrent Other assets Other Assets Noncurrent Total assets Assets Liabilities and partners’ capital Liabilities And Stockholders Equity [Abstract] Current liabilities: Liabilities Current [Abstract] Current portion of long-term debt and capital lease obligations Long Term Debt And Capital Lease Obligations Current Accrued interest Interest Payable Current Accounts payable Accounts Payable Current Accrued expenses and other current liabilities Accrued Expenses And Other Current Liabilities Due to affiliates Due To Affiliate Current Total current liabilities Liabilities Current Long-term debt and capital lease obligations Long Term Debt And Capital Lease Obligations Sale-leaseback financing arrangements Sale Leaseback Transaction Amount Due Under Financing Arrangements Asset retirement obligations Asset Retirement Obligations Noncurrent Other long-term liabilities Other Liabilities Noncurrent Total liabilities Liabilities Limited partners' capital (deficit): Partners Capital Including Portion Attributable To Noncontrolling Interest [Abstract] Total limited partners' capital Partners Capital Noncontrolling interests Partners Capital Attributable To Noncontrolling Interest Total partners' capital Partners Capital Including Portion Attributable To Noncontrolling Interest Total liabilities and partners' capital Liabilities And Stockholders Equity Capital units, Outstanding Common Unit Outstanding Cost of coal produced excluding depreciation depletion and amortization. Costs incurred during the reporting period for purchased coal sold. Amount of expenses associated with the corporate reorganization. Net income loss net of tax per outstanding limited partnership unit basic and diluted. Net income (loss) attributable to the limited partnership from the close date of the IPO to the end of the period. Income Statement [Abstract] Revenues Revenues [Abstract] Coal sales Coal Products And Services Revenue Other revenues Other Sales Revenue Net Total revenues Revenues Costs and expenses: Costs And Expenses [Abstract] Cost of coal produced (excluding depreciation, depletion and amortization) Cost Of Coal Produced Excluding Depreciation Depletion And Amortization Cost of coal purchased Outside Coal Purchases Transportation Shipping Handling And Transportation Costs Depreciation, depletion and amortization Depreciation Depletion And Amortization Accretion on asset retirement obligations Asset Retirement Obligation Accretion Expense Selling, general and administrative Selling General And Administrative Expense Long-lived asset impairments Impairment Of Long Lived Assets Held For Use Transition and reorganization costs Transition And Reorganization Costs Gain on commodity derivative contracts Gain Loss On Derivative Instruments Net Pretax Other operating income, net Other Operating Income Expense Net Operating income Operating Income Loss Other expenses: Nonoperating Income Expense [Abstract] Interest expense, net Interest Income Expense Net Debt restructuring costs Gains Losses On Restructuring Of Debt Loss on early extinguishment of debt Gains Losses On Extinguishment Of Debt Net (loss) income Profit Loss Less: net income attributable to noncontrolling interests Net Income Loss Attributable To Noncontrolling Interest Net (loss) income attributable to controlling interests Net Income Loss Less: net income attributable to predecessor equity Net Income Loss Attributable To Predecessor Equity Net income subsequent to initial public offering available to limited partner units - basic and diluted: Net Income Loss Net Of Tax Per Outstanding Limited Partnership Unit Basic And Diluted [Abstract] Net (loss) income attributable to limited partner units Net Income Loss Subsequent To Initial Public Offering Attributable To Limited Partner Units Net (loss) income subsequent to initial public offering per limited partner unit - basic and diluted Net Income Loss Per Outstanding Limited Partnership And General Partnership Unit Basic And Diluted Weighted average limited partner units outstanding - basic and diluted: Earnings Per Unit [Abstract] Weighted average limited partner units outstanding - basic and diluted Weighted Average Number Of Limited Partnership And General Partnership Unit Outstanding Basic And Diluted Distributions declared per limited partner unit Distribution Made To Limited Partner Distributions Declared Per Unit Consolidation of variable interest entities. Contribution from predecessor company. Non cash distributions. Capital contribution from partners. Contribution of net assets to partners. Distributions declared or paid to limited partner’s predecessor members and noncontrolling interests. Distribution equivalent rights on LTIP awards. Statement Of Partners Capital [Abstract] Partner Type Partner Type Of Partners Capital Account [Axis] Partner Type of Partners' Capital Account, Name Partner Type Of Partners Capital Account Name [Domain] Limited Partners Limited Partner [Member] Partner Capital Components Partner Capital Components [Axis] Partner Capital Components Partner Capital Components [Domain] Noncontrolling Interest Noncontrolling Interest [Member] Predecessor Equity (Deficit) Beginning Balance Net (loss) income Consolidation of variable interest entities Consolidation Of Variable Interest Entities Contributions Contribution From Predecessor Company Non-cash distributions Non Cash Distributions Capital contribution from Foresight Reserves LP Capital Contribution From Partners Contribution of net assets to Foresight Energy LP Contribution Of Net Assets To Partners Issuance of common units, net of offering costs Partners Capital Account Public Sale Of Units Net Of Offering Costs Issuance of common units, net of offering costs (in units) Partners Capital Account Units Sale Of Units Cash distributions Distributions Declared Or Paid To Limited Partners Predecessor Members And Noncontrolling Interests Equity-based compensation Partners Capital Account Unit Based Compensation Issuance of equity-based awards Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Distribution equivalent rights on LTIP awards Distribution Equivalent Rights On Long Term Incentive Plan Awards Net settlement of withholding taxes on issued LTIP awards Adjustments Related To Tax Withholding For Share Based Compensation Ending Balance Ending Balance (in units) Partners Capital Account Units Realized gains on commodity derivative contracts included in investing activities. Transition and reorganization expenses paid by Partner. Noncash loss on early extinguishment of debt. Increase (decrease) in affiliates receivables and payables net. The cash outflow associated with the purchase of all investments affiliate (debt, security, other) during the period. Return of investment on financing arrangements with affiliate. Statement Of Cash Flows [Abstract] Cash flows from operating activities Net Cash Provided By Used In Operating Activities Continuing Operations [Abstract] Adjustments to reconcile net (loss) income to net cash provided by operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Amortization of debt issuance costs and debt premium/discount Amortization Of Financing Costs And Discounts Equity-based compensation Share Based Compensation Unrealized gains on commodity derivative contracts Unrealized Gain Loss On Derivatives Realized gains on commodity derivative contracts included in investing activities Realized Gains On Commodity Derivative Contracts Included In Investing Activities Transition and reorganization expenses paid by Foresight Reserves (affiliate) Transition And Reorganization Expenses Paid By Partner Non-cash loss on early extinguishment of debt Noncash Loss On Early Extinguishment Of Debt Other Other Noncash Income Expense Changes in operating assets and liabilities: Increase Decrease In Operating Capital [Abstract] Accounts receivable Increase Decrease In Accounts And Other Receivables Due from/to affiliates, net Increase Decrease In Affiliates Receivables And Payables Net Inventories Increase Decrease In Inventories Prepaid expenses and other current assets Increase Decrease In Prepaid Deferred Expense And Other Assets Prepaid royalties Increase Decrease In Prepaid Royalties Coal derivative assets and liabilities Increase Decrease In Derivative Assets And Liabilities Accounts payable Increase Decrease In Accounts Payable Accrued interest Increase Decrease In Interest Payable Net Accrued expenses and other current liabilities Increase Decrease In Other Current Liabilities Other Increase Decrease In Other Operating Capital Net Net cash provided by operating activities Net Cash Provided By Used In Operating Activities Continuing Operations Cash flows from investing activities Net Cash Provided By Used In Investing Activities Continuing Operations [Abstract] Investment in property, plant, equipment and development Payments To Acquire Property Plant And Equipment Investment in financing arrangements with Murray Energy (affiliate) Payments To Acquire Investments Affiliate Settlement of certain coal derivatives Proceeds From Derivative Instrument Investing Activities Return of investment on financing arrangements with Murray Energy (affiliate) Return Of Investment On Financing Arrangements With Affiliate Acquisition of an affiliate Payments To Acquire Businesses And Interest In Affiliates Proceeds from sale of equipment Proceeds From Sale Of Property Plant And Equipment Net cash used in investing activities Net Cash Provided By Used In Investing Activities Continuing Operations Cash flows from financing activities Net Cash Provided By Used In Financing Activities Continuing Operations [Abstract] Net increase in borrowings under revolving credit facility Proceeds From Repayments Of Lines Of Credit Net increase in borrowings under A/R securitization program Proceeds From Repayments Of Accounts Receivable Securitization Proceeds from other long-term debt and capital lease obligations Proceeds From Issuance Of Long Term Debt And Capital Securities Net Payments on other long-term debt and capital lease obligations Repayments Of Long Term Debt And Capital Securities Payments on short-term debt Repayments Of Short Term Debt Distributions paid Payments Of Distributions To Affiliates Proceeds from issuance of common units (net of underwriters' discount) Proceeds From Issuance Of Common Limited Partners Units Initial public offering costs paid (other than underwriters' discount) Payments Of Stock Issuance Costs Debt issuance costs paid Payments Of Debt Issuance Costs Other Proceeds From Payments For Other Financing Activities Net cash (used in) provided by financing activities Net Cash Provided By Used In Financing Activities Continuing Operations Net (decrease) increase 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 Organization Consolidation And Presentation Of Financial Statements [Abstract] Organization and Basis of Presentation Organization Consolidation And Presentation Of Financial Statements Disclosure [Text Block] Accounting Policies [Abstract] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Debt defaults and liquidity. Debt Disclosure [Abstract] Debt Defaults and Liquidity Debt Defaults And Liquidity [Text Block] Transition and reorganization costs. Restructuring Charges [Abstract] Transition and Reorganization Costs Transition And Reorganization Costs [Text Block] Derivative Instruments And Hedging Activities Disclosure [Abstract] Commodity Derivative Contracts Derivative Instruments And Hedging Activities Disclosure [Text Block] Receivables [Abstract] Accounts Receivable Loans Notes Trade And Other Receivables Disclosure [Text Block] Inventory Disclosure [Abstract] Inventories Inventory Disclosure [Text Block] Property Plant And Equipment [Abstract] Property, Plant, Equipment and Development, Net Property Plant And Equipment Disclosure [Text Block] Payables And Accruals [Abstract] Accrued Expenses and Other Current Liabilities Accounts Payable Accrued Liabilities And Other Liabilities Disclosure Current [Text Block] Long-Term Debt and Capital Lease Obligations Debt And Capital Leases Disclosures [Text Block] Leases Capital [Abstract] Sale-Leaseback Financing Arrangements Sale Leaseback Transaction Disclosure [Text Block] Contractual arrangements and operating leases. Leases Operating [Abstract] Contractual Arrangements and Operating Leases Contractual Arrangements And Operating Leases [Text Block] Asset Retirement Obligation Disclosure [Abstract] Asset Retirement Obligations Asset Retirement Obligation Disclosure [Text Block] Coal workers' pneumoconiosis and workers' compensation. Postemployment Benefits [Abstract] Coal Workers' Pneumoconiosis and Workers' Compensation Coal Workers Pneumoconiosis And Workers Compensation Disclosure [Text Block] Related Party Transactions [Abstract] Related-Party Transactions Related Party Transactions Disclosure [Text Block] Variable Interest Entities (VIEs) Variable Interest Entity Disclosure [Text Block]