Business Segment Reporting - Schedule of Earnings (Losses) Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Segment Reporting [Line Items]
Total operating businesses	$ 51,619	$ 65,102	$ 32,737	$ 23,919
Operating Segments
Segment Reporting [Line Items]
Total operating businesses	18,233	9,078	25,520	24,220
Nonsegment
Segment Reporting [Line Items]
Investment partnership gains (losses)	35,637	58,504	22,183	8,912
Investment gains (losses)	9,708	2,925	8,421	1,340
Interest expenses not allocated to segments	(5,532)	(852)	(11,183)	(1,752)
Corporate and other
Segment Reporting [Line Items]
Corporate and other	$ (6,427)	$ (4,553)	$ (12,204)	$ (8,801)

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details