Deferred Policy Acquisition Costs - Schedule of Major Categories of the Deferred Policy Acquisition Costs (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred Charges Insurers [Abstract]
Agents’ commissions	$ 15,286	$ 15,997
Premium taxes	2,578	3,121
Deferred underwriting expenses	1,436	1,294
Total deferred policy acquisition costs	$ 19,300	$ 20,412	$ 19,649	$ 19,171