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Schedule of Investment Income (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Investment income $ 12,114 $ 9,444
Investment expense (710) (800)
Net investment income 11,404 8,644
Fixed Maturities    
Schedule of Available-for-sale Securities [Line Items]    
Investment income 8,528 6,678
Equity Securities    
Schedule of Available-for-sale Securities [Line Items]    
Investment income 999 990
Cash and Cash Equivalents    
Schedule of Available-for-sale Securities [Line Items]    
Investment income 264 84
Other Invested Assets    
Schedule of Available-for-sale Securities [Line Items]    
Investment income $ 2,323 $ 1,692