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Investments - Additional Information (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Schedule of Investments [Line Items]      
Equity method investments $ 35,900,000   $ 32,800,000
Gains (losses) on equity method investments 2,803,000 $ 1,466,000  
Impairment charge on equity method investments 0    
Equity method investment, amount sold 0 0  
Equity investments carried under measurement alternative 200,000   200,000
Equity investments carried under measurement alternative, impairment 0 0  
Equity investments carried under measurement alternative, loss 0 0  
Equity investments carried under measurement alternative, gain 0 0  
Consolidated VIE, total assets 4,941,282,000   3,342,166,000
Consolidated VIE, total liabilities 4,187,832,000   2,660,090,000
Maximum exposure to loss 4,600,000   4,500,000
Other Nonoperating Income (Expense)      
Schedule of Investments [Line Items]      
Equity investments carried under measurement alternative, loss 100,000 $ 0  
Variable Interest Entity, Primary Beneficiary      
Schedule of Investments [Line Items]      
Consolidated VIE, total assets 7,700,000   6,800,000
Consolidated VIE, total liabilities $ 1,500,000   $ 1,300,000