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Deferred Policy Acquisition Costs - Summary of Activity with Respect to Deferred Policy Acquisition Costs (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]      
Beginning balance $ 18,602 $ 15,014  
Policy acquisition costs deferred 35,905 39,812  
Amortization (37,868) (36,224) $ (32,918)
Ending balance $ 16,639 $ 18,602 $ 15,014