v3.25.4
Consolidated Investment Products - Schedule of Results of Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Condensed Income Statements, Captions [Line Items]    
Revenue $ 72,846 $ 55,808
Operating expenses:    
Compensation and related employee benefits 32,028 37,550
Sales, distribution and marketing 15,703 19,093
Depreciation and amortization 1,116 1,816
General and administrative expenses 10,174 10,090
Expenses of consolidated investment products 2,742 2,319
Total operating expenses 61,763 70,868
Operating income (loss) 11,083 (15,060)
Other income (expense):    
Equity earnings (losses), net (4,866) 6,037
Interest and dividends 2,375 1,714
Other income (expense) (1,185) (2,985)
Unrealized (loss) gain on digital assets, net (796) 6,984
Realized gain on investments, net 2,398 432
Unrealized gain (losses) on investments net (15,554) 41,329
Total other income (expense), net (27,002) 914,623
Income (loss) from continuing operations before income taxes (15,919) 899,563
Income tax (expense) benefit 23,219 (104,381)
Income (loss) from continuing operations, net of tax 7,300 795,182
Income (loss) from discontinued operations, net of tax (1,300) (371)
Net income (loss) 6,000 794,811
Less: net income attributable to redeemable noncontrolling interests (882) (702,339)
Net income (loss) attributable to Horizon Kinetics Holding Corporation 5,118 92,472
Management and Advisory Fees    
Condensed Income Statements, Captions [Line Items]    
Revenue 72,388 55,486
Other Income and Fees    
Condensed Income Statements, Captions [Line Items]    
Revenue 458 322
Eliminations    
Condensed Income Statements, Captions [Line Items]    
Revenue (7,573) (55,995)
Operating expenses:    
General and administrative expenses   (107)
Expenses of consolidated investment products (7,573) (7,896)
Total operating expenses (7,573) (8,003)
Operating income (loss) (0) (47,992)
Other income (expense):    
Equity earnings (losses), net 20,571 (100,566)
Total other income (expense), net 20,571 (100,566)
Income (loss) from continuing operations before income taxes 20,571 (148,558)
Income (loss) from continuing operations, net of tax 20,571 (148,558)
Net income (loss) 20,571 (148,558)
Less: net income attributable to redeemable noncontrolling interests (1,423) 60,356
Net income (loss) attributable to Horizon Kinetics Holding Corporation (19,148) (88,202)
Eliminations | Management and Advisory Fees    
Condensed Income Statements, Captions [Line Items]    
Revenue (7,573) (55,995)
Consolidated Company Entities | Operating Segment    
Condensed Income Statements, Captions [Line Items]    
Revenue 80,419 111,803
Operating expenses:    
Compensation and related employee benefits 32,028 37,550
Sales, distribution and marketing 15,703 19,093
Depreciation and amortization 1,116 1,816
General and administrative expenses 10,174 10,197
Total operating expenses 59,021 68,656
Operating income (loss) 21,398 43,147
Other income (expense):    
Equity earnings (losses), net (25,437) 106,603
Interest and dividends 2,375 1,714
Other income (expense) (1,185) (2,985)
Unrealized (loss) gain on digital assets, net (796) 6,984
Realized gain on investments, net 2,398 432
Unrealized gain (losses) on investments net (15,554) 41,329
Total other income (expense), net (38,199) 154,077
Income (loss) from continuing operations before income taxes (16,801) 197,224
Income tax (expense) benefit 23,219 (104,381)
Income (loss) from continuing operations, net of tax 6,418 92,843
Income (loss) from discontinued operations, net of tax (1,300) (371)
Net income (loss) 5,118 92,472
Net income (loss) attributable to Horizon Kinetics Holding Corporation 5,118 92,472
Consolidated Company Entities | Operating Segment | Management and Advisory Fees    
Condensed Income Statements, Captions [Line Items]    
Revenue 79,961 111,481
Consolidated Company Entities | Operating Segment | Other Income and Fees    
Condensed Income Statements, Captions [Line Items]    
Revenue 458 322
Consolidated Investment Products    
Other income (expense):    
Interest and dividends 8,394 20,377
Other income (expense) (17,768) 840,735
Consolidated Investment Products | Operating Segment    
Operating expenses:    
Expenses of consolidated investment products 10,315 10,215
Total operating expenses 10,315 10,215
Operating income (loss) (10,315) (10,215)
Other income (expense):    
Interest and dividends 8,394 20,377
Other income (expense) (17,768) 840,735
Total other income (expense), net (9,374) 861,112
Income (loss) from continuing operations before income taxes (19,689) 850,897
Income (loss) from continuing operations, net of tax (19,689) 850,897
Net income (loss) (19,689) 850,897
Less: net income attributable to redeemable noncontrolling interests 541 (762,695)
Net income (loss) attributable to Horizon Kinetics Holding Corporation $ (19,148) $ 88,202