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Investments - Schedule of Other Long-Term Investments (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Long-Term Investment [Line Items]      
Other long-term investments $ 492,884 $ 492,884 $ 326,347
Capital called from investment funds 50,000    
Investment funds, unfunded commitments 408,000 $ 408,000  
Investment funds | Minimum      
Long-Term Investment [Line Items]      
Investment funds ownership percentage   1.00%  
Investment funds | Maximum      
Long-Term Investment [Line Items]      
Investment funds ownership percentage   20.00%  
Commercial mortgage participations      
Long-Term Investment [Line Items]      
Other long-term investments 164,902 $ 164,902 137,692
Other      
Long-Term Investment [Line Items]      
Other long-term investments 1,341 1,341 2,804
Partnership Interest - Fair Value Option | Investment funds      
Long-Term Investment [Line Items]      
Other long-term investments $ 326,641 $ 326,641 $ 185,851