Income Taxes - Valuation Allowances (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at January 1	$ 2,006	$ 1,833	$ 1,868
Charged to costs and expenses	6,625	0	0
(Deductions)/Other	(799)	173	(35)
Balance at December 31	$ 7,832	$ 2,006	$ 1,833