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Other Assets - Summary of Other Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Benefits receivable related to retrospective reinsurance contracts $ 40,492 $ 28,123
Deferred costs related to retrospective reinsurance contracts 1,011 473
Deferred offering costs on senior notes 3,308 3,653
Prepaid expenses 2,058 1,444
Restricted cash 300 300
Other 982 1,594
Total other assets $ 48,151 $ 35,587