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Investments - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Schedule of Investments [Line Items]          
Equity method investments $ 33,200   $ 33,200   $ 37,700
Gains (losses) on equity method investments 1,323 $ 1,119 2,789 $ 2,142  
Impairment charge on equity method investments 0 0 0 2,500  
Equity method investment, amount sold 3,800 0 3,800 0  
Equity investments carried under measurement alternative 200   200   400
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 5,133,479   5,133,479   3,949,300
Consolidated VIE, total liabilities 4,324,552   4,324,552   3,120,397
Maximum exposure to loss 4,800   4,800   4,800
Other Nonoperating Income (Expense)          
Schedule of Investments [Line Items]          
Equity investments carried under measurement alternative, loss 87 $ 6 87 $ 46  
Disposal Group, Held-for-sale, Not Discontinued Operations          
Schedule of Investments [Line Items]          
Equity method investments 2,600   2,600    
Equity investments carried under measurement alternative 200   200    
Variable Interest Entity, Primary Beneficiary          
Schedule of Investments [Line Items]          
Consolidated VIE, total assets 8,200   8,200   7,200
Consolidated VIE, total liabilities $ 1,800   $ 1,800   $ 1,000