Income Taxes - Summary of Changes in Valuation Allowance (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Valuation allowance at beginning of year	$ 7,428	$ 7,743	$ 727
Current year income		(101)	(65)
State net operating loss		(155)	(406)
Blended state rate changes	(71)
Capital (loss) gain	(63)	(59)	7,487
Valuation allowance at end of year	$ 7,294	$ 7,428	$ 7,743