Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Income tax expense (benefit) allocated to comprehensive income (loss), Tax	$ 83	$ (198)	$ 136
Change in valuation allowance, expense (benefit)	(2,385)	(7,618)	$ 2,222
Operating loss carryforwards	45,900
Capital loss carryforward	3,658
Unrecognized tax benefits that would impact effective tax rate	$ 580
Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		14,367
State [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		$ 79,666