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Investments - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Schedule of Investments [Line Items]          
Equity method investments $ 30,600,000   $ 30,600,000   $ 37,700,000
Gains (losses) on equity method investments 1,816,000 $ 1,527,000 4,605,000 $ 3,669,000  
Impairment charge on equity method investments 0 200,000 0 2,700,000  
Equity method investment, amount sold 0 0 3,800,000 0  
Equity investments carried under measurement alternative 200,000   200,000   400,000
Equity investments carried under measurement alternative, impairment 0 0 0 0  
Equity investments carried under measurement alternative, loss 0 0 0 0  
Equity investments carried under measurement alternative, gain 0 0 0 0  
Consolidated VIE, total assets 5,415,607,000   5,415,607,000   3,953,242,000
Consolidated VIE, total liabilities 4,711,771,000   4,711,771,000   3,121,271,000
Maximum exposure to loss 4,900,000   4,900,000   4,800,000
Other Nonoperating Income (Expense)          
Schedule of Investments [Line Items]          
Equity investments carried under measurement alternative, loss 200,000 $ 1,000,000 100,000 $ 1,000,000  
Disposal Group, Held-for-sale, Not Discontinued Operations          
Schedule of Investments [Line Items]          
Equity method investments 2,600,000   2,600,000    
Equity investments carried under measurement alternative 200,000   200,000    
Variable Interest Entity, Primary Beneficiary          
Schedule of Investments [Line Items]          
Consolidated VIE, total assets 8,700,000   8,700,000   7,200,000
Consolidated VIE, total liabilities $ 2,200,000   $ 2,200,000   $ 1,000,000