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Other Assets - Summary of Other Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Benefits receivable related to retrospective reinsurance contracts $ 5,810 $ 35,716
Deferred costs related to retrospective reinsurance contracts   460
Prepaid expenses 1,581 904
Lease acquisition costs, net 615  
Restricted cash 600 300
Other 2,736 1,748
Total other assets $ 11,342 $ 39,128