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Investments - Summary of Net Investment Income (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Investment [Line Items]        
Net Realized and Unrealized Gain (Loss) on Trading Securities $ 5,532 $ 7,014    
Trading Securities, Realized Gain (Loss) 1,513 612    
Investment expense (1,477) (1,967) $ (4,358) $ (5,167)
Securities available-for-sale and short-term 36,330 49,985 161,211 222,278
Net investment income 44,537 58,332 185,838 235,234
Gains (losses) on securities held as of reporting date [Member]        
Investment [Line Items]        
Net Realized and Unrealized Gain (Loss) on Trading Securities     19,245 9,067
Trading Securities, Realized Gain (Loss)     3,925 (2,067)
Other Investments Income 4,019 6,402 15,320 11,134
Fixed Income Investments [Member]        
Investment [Line Items]        
Gross Investment Income, Operating 33,462 49,372 151,265 219,222
Short-Term [Member]        
Investment [Line Items]        
Gross Investment Income, Operating 4,165 2,395 13,759 7,671
Loans Receivable [Member]        
Investment [Line Items]        
Gross Investment Income, Operating 180 185 545 552
Other Investments [Member]        
Investment [Line Items]        
Gross Investment Income, Operating $ 8,207 $ 8,347 $ 24,627 $ 12,956