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Goodwill and Other Intangible Assets - Gross Cost and Accumulated Amortization of Other Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Other intangible assets, Gross Cost $ 70,365 $ 70,365
Other intangible assets, accumulated amortization 70,200 70,155
Other intangible assets, Net Carrying Amount 165 210
Success/Incentive Fees [Member]    
Finite-Lived Intangible Assets [Line Items]    
Other intangible assets, Gross Cost 35,385 35,385
Other intangible assets, accumulated amortization 35,385 35,385
Management Fees, Customer Relationships and Non-Compete Agreements [Member]    
Finite-Lived Intangible Assets [Line Items]    
Other intangible assets, Gross Cost 34,980 34,980
Other intangible assets, accumulated amortization 34,815 34,770
Other intangible assets, Net Carrying Amount $ 165 $ 210