Accumulated Other Comprehensive Income (Loss) - Summary of Components of AOCI (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity [Abstract]
Accumulated other comprehensive income (loss)	$ (2,138)	$ 200
Other comprehensive income (loss)	(3,200)	(3,800)
Income tax benefit (expense)	1,200	1,400
Total other comprehensive income (loss)	(1,977)	(2,372)	$ 234
Accumulated other comprehensive income (loss)	$ (4,115)	$ (2,138)	$ 200