Revenue - Schedule of Contract with Customer (Details) - Operating Segments - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024	Dec. 31, 2023
Management/advisory fees
Contract with Customer, Receivable, after Allowance for Credit Loss [Roll Forward]
Contract with customer, receivable	$ 34,745	$ 28,896	$ 26,802
Deferred revenue	(181)	0	0
Management/advisory fees | Related party
Contract with Customer, Receivable, after Allowance for Credit Loss [Roll Forward]
Contract with customer, receivable	500	700
Incentive fees
Contract with Customer, Receivable, after Allowance for Credit Loss [Roll Forward]
Contract with customer, receivable	2,992	1,324	40,356
Incentive fees | Related party
Contract with Customer, Receivable, after Allowance for Credit Loss [Roll Forward]
Contract with customer, receivable	1,300	200
Other fees/income
Contract with Customer, Receivable, after Allowance for Credit Loss [Roll Forward]
Contract with customer, receivable	0	0	0
Deferred revenue	$ 0	$ 0	$ 0