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Schedule of Net Investment Income (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income, before expense   $ 293,528 $ 409,919 $ 408,013
Investment expenses   4,957 12,836 9,082
Net investment income   288,571 397,083 398,931
Fixed income securities        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income, before expense   231,972 330,707 334,931
Commercial Mortgage Loans        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income, before expense   49,417 69,360 63,028
Cash And Short Term Investments        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income, before expense   4,786 1,007 511
Other investment (loss) income        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income, before expense   $ 7,353 $ 8,845 $ 9,543
Predecessor        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income, before expense $ 2,477      
Investment expenses 127      
Net investment income 2,350      
Predecessor | Fixed income securities        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income, before expense 2,461      
Predecessor | Cash And Short Term Investments        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income, before expense $ 16