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Investments - Summary of Financial Information for Company's Equity Method Investments (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statements of operations:                            
Total revenues $ 479,426 $ 455,039 $ 519,088 $ 603,167 $ 487,156 $ 521,137 $ 551,187 $ 544,751     $ 2,056,720 $ 2,104,231 $ 1,937,810  
Total expenses 502,343 442,874 473,464 567,131 529,248 519,624 514,932 471,410     1,985,812 2,035,214 1,823,916  
Consolidated net income (loss) (12,744) 9,904 39,273 20,169 (33,475) $ (1,553) $ 22,307 $ 84,974 $ 59,442 $ 69,346 56,602 72,253 286,610  
Statements of financial condition:                            
Total assets 3,949,300       3,926,914           3,949,300 3,926,914    
Total liabilities 3,120,397       3,178,308           3,120,397 3,178,308    
Total partners’ capital 808,229 $ 767,681 $ 742,760 $ 696,324 724,968       $ 742,760 $ 767,681 808,229 724,968 849,781 $ 1,127,870
Total liabilities, redeemable partnership interest, and equity 3,949,300       3,926,914           3,949,300 3,926,914    
Equity Method Investment Nonconsolidated Investee [Member]                            
Statements of operations:                            
Total revenues                     94,744 77,211 85,619  
Total expenses                     71,241 61,680 72,906  
Consolidated net income (loss)                     23,503 15,531 $ 12,713  
Statements of financial condition:                            
Total assets 121,498       90,516           121,498 90,516    
Total partners’ capital 49,478       42,229           49,478 42,229    
Total liabilities, redeemable partnership interest, and equity 121,498       90,516           121,498 90,516    
Equity Method Investment Nonconsolidated Investee [Member] | Cash and Cash Equivalents [Member]                            
Statements of financial condition:                            
Total assets 89,627       64,614           89,627 64,614    
Equity Method Investment Nonconsolidated Investee [Member] | Fixed Assets, Net [Member]                            
Statements of financial condition:                            
Total assets 2,806       3,120           2,806 3,120    
Equity Method Investment Nonconsolidated Investee [Member] | Other Assets [Member]                            
Statements of financial condition:                            
Total assets 29,065       22,782           29,065 22,782    
Equity Method Investment Nonconsolidated Investee [Member] | Payables to Related Parties [Member]                            
Statements of financial condition:                            
Total liabilities 2,000       2,000           2,000 2,000    
Equity Method Investment Nonconsolidated Investee [Member] | Other Liabilities [Member]                            
Statements of financial condition:                            
Total liabilities $ 70,020       $ 46,287           $ 70,020 $ 46,287