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Investments - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Schedule of Investments [Line Items]          
Equity method investments $ 37,300,000   $ 37,300,000   $ 32,800,000
Gains (losses) on equity method investments 2,729,000 $ 1,323,000 5,532,000 $ 2,789,000  
Impairment charge on equity method investments 0   0    
Equity method investment, amount sold 0 3,800,000 0 3,800,000  
Equity investments carried under measurement alternative 200,000   200,000   200,000
Equity investments carried under measurement alternative, impairment     0    
Equity investments carried under measurement alternative, loss 0     0  
Equity investments carried under measurement alternative, gain   $ 0      
Total assets 4,886,889,000   4,886,889,000   3,342,166,000
Total liabilities 4,139,750,000   4,139,750,000   2,660,090,000
Maximum Exposure to Loss 4,300,000   4,300,000   4,500,000
Other nonoperating income (expense)          
Schedule of Investments [Line Items]          
Equity investments carried under measurement alternative, loss 1,800,000   1,900,000 $ 87,000  
Variable interest entity, primary beneficiary          
Schedule of Investments [Line Items]          
Total assets 7,500,000   7,500,000   6,800,000
Total liabilities $ 1,900,000   $ 1,900,000   $ 1,300,000