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Investments - Rollforward of Cumulative Credit Losses in Other-Than-Temporary Impairment Losses Recognized in Income from Available for Sale Fixed-Maturity Securities (Detail) - Available-for-Sale Securities [Member] - Fixed-Maturity Securities [Member] - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Beginning Balance   $ 404 $ 111  
Credit impaired security fully disposed of for which there was no prior intent or requirement to sell   (385)    
Credit impairments on impaired securities $ 180     $ 109
Additional credit impairments on previously impaired securities     293  
Reduction due to increase in expected cash flows recognized over the remaining life of the previously impaired security   $ (19)    
Ending Balance $ 180   $ 404 $ 109