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Investments (Limited Partnership Investments) - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Schedule Of Investments [Line Items]          
Recognized investment income (loss) $ 689 $ 476 $ (2,058) $ 1,308  
Return on investment     650 3,647  
Limited Partnership [Member]          
Schedule Of Investments [Line Items]          
Cash distributions 850 724 1,742 4,810  
Return on investment 72 $ 31 650 $ 3,647  
Company's net cumulative contributed capital to the partnership 28,976   28,976   $ 27,117
Maximum exposure loss relating to VIE $ 27,497   $ 27,497   $ 28,346