Income Taxes - Summary of Net Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Net operating loss carryforwards	$ 24,208	$ 6,859
Stock-based compensation	404	421
Unearned premiums and loss and loss adjustment expense reserves	6,752	6,797
Goodwill and identifiable intangible assets	2,832	4,252
Alternative minimum tax (“AMT”) credit carryforwards	2,015	2,015
Accrued expenses and other nondeductible items	1,345	1,551
Other	3,619	3,528
Deferred Tax Assets, Gross, Total	41,175	25,423
Deferred tax liabilities:
Deferred acquisition costs	(1,698)	(1,928)
Identifiable intangible assets	(1,872)	(1,872)
Net unrealized gain on investments	(73)	(1,244)
Other	(19)	(332)
Deferred tax liabilities, gross	(3,662)	(5,376)
Total net deferred tax asset	37,513	20,047
Less: Valuation allowance	(1,872)	(1,746)
Net deferred tax asset	$ 35,641	$ 18,301