v3.25.3
Consolidated Investment Products - Schedule of Results of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Condensed Income Statements, Captions [Line Items]                
Revenue $ 17,893     $ 13,059     $ 55,810 $ 37,565
Operating expenses:                
Compensation, related employee benefits, and cost of goods sold             24,718 19,903
Sales, distribution and marketing 3,774     2,972     12,048 7,881
Depreciation and amortization 199     455     917 1,374
General and administrative expenses 2,520     2,744     7,728 7,397
Expenses of consolidated investment products 766     590     2,078 1,651
Total operating expenses 14,944     13,981     47,489 38,206
Operating income (loss) 2,949     (922)     8,321 (641)
Other income (expense):                
Equity in earnings of proprietary funds, net (2,033)     1,617     (3,543) 3,683
Interest and dividends 530     891     1,475 1,261
Other income (expense) (290)     (2,676)     (530) (2,857)
Unrealized gain (loss) on digital assets, net 1,260     (95)     2,908 2,792
Realized gain on investments, net 32     23     2,229 342
Unrealized gain (loss) on investments net (7,046)     11,321     (8,734) 24,942
Total other income, net 123,479     162,589     184,356 490,126
Income (loss) from continuing operations before provision for income taxes 126,428     161,667     192,677 489,485
Income tax (expense) benefit 10,370     (69,296)     3,840 (70,774)
Net income (loss) from continuing operations, net of tax             196,517 418,711
Net Income (loss) from discontinued operations, net of tax             (1,300) (147)
Net income (loss) 136,735     92,224     195,217 418,564
Less: net income attributable to redeemable noncontrolling interests (129,500)     (130,391)     (175,630) (401,852)
Net (loss) income attributable to Horizon Kinetics Holding Corporation 7,235 $ (10,489) $ 22,841 (38,167) $ 14,038 $ 40,841 19,587 16,712
Management and Advisory Fees                
Condensed Income Statements, Captions [Line Items]                
Revenue 17,764     13,036     55,465 37,277
Other Income and Fees                
Condensed Income Statements, Captions [Line Items]                
Revenue 129     23     345 288
Eliminations                
Condensed Income Statements, Captions [Line Items]                
Revenue             (5,775) (4,458)
Operating expenses:                
General and administrative expenses             (64) (67)
Expenses of consolidated investment products             64 67
Total operating expenses               0
Operating income (loss)             (5,775) (4,458)
Other income (expense):                
Equity in earnings of proprietary funds, net             (7,132) (52,069)
Management fees of consolidated investment products             5,498 0
Total other income, net             (1,634) (52,069)
Income (loss) from continuing operations before provision for income taxes             (7,409) (56,527)
Net income (loss) from continuing operations, net of tax             (7,409) (56,527)
Net income (loss)             (7,409) (56,527)
Less: net income attributable to redeemable noncontrolling interests             (26,143) 0
Net (loss) income attributable to Horizon Kinetics Holding Corporation             (33,552) (56,527)
Eliminations | Management and Advisory Fees                
Condensed Income Statements, Captions [Line Items]                
Revenue             (5,775) (4,458)
Consolidated Company Entities | Operating Segment                
Condensed Income Statements, Captions [Line Items]                
Revenue             61,585 42,023
Operating expenses:                
Compensation, related employee benefits, and cost of goods sold             24,718 19,903
Sales, distribution and marketing             12,048 7,881
Depreciation and amortization             917 1,374
General and administrative expenses             7,792 7,464
Total operating expenses             45,475 36,622
Operating income (loss)             16,110 5,401
Other income (expense):                
Equity in earnings of proprietary funds, net             3,589 55,752
Interest and dividends             1,475 1,261
Other income (expense)             (530) (2,857)
Unrealized gain (loss) on digital assets, net             2,908 2,792
Realized gain on investments, net             2,229 342
Unrealized gain (loss) on investments net             (8,734) 24,942
Total other income, net             937 82,232
Income (loss) from continuing operations before provision for income taxes             17,047 87,633
Income tax (expense) benefit             3,840 (70,774)
Net income (loss) from continuing operations, net of tax             20,887 16,859
Net Income (loss) from discontinued operations, net of tax             (1,300) (147)
Net income (loss)             19,587 16,712
Net (loss) income attributable to Horizon Kinetics Holding Corporation             19,587 16,712
Consolidated Company Entities | Operating Segment | Management and Advisory Fees                
Condensed Income Statements, Captions [Line Items]                
Revenue             61,240 41,735
Consolidated Company Entities | Operating Segment | Other Income and Fees                
Condensed Income Statements, Captions [Line Items]                
Revenue             345 288
Consolidated Investment Products                
Other income (expense):                
Interest and dividends 1,627     8,888     6,418 17,494
Other income (expense) $ 129,399     $ 142,620     184,133 442,469
Consolidated Investment Products | Operating Segment                
Operating expenses:                
Expenses of consolidated investment products             2,014 1,584
Total operating expenses             2,014 1,584
Operating income (loss)             (2,014) (1,584)
Other income (expense):                
Interest and dividends             6,418 17,494
Other income (expense)             184,133 442,469
Management fees of consolidated investment products             (5,498) 0
Total other income, net             185,053 459,963
Income (loss) from continuing operations before provision for income taxes             183,039 458,379
Net income (loss) from continuing operations, net of tax             183,039 458,379
Net income (loss)             183,039 458,379
Less: net income attributable to redeemable noncontrolling interests             (149,487) (401,852)
Net (loss) income attributable to Horizon Kinetics Holding Corporation             $ 33,552 $ 56,527