Property and Equipment - Narrative (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 19,626	$ 14,980	$ 13,225
Amortization expense related to other assets	$ 894	$ 1,141	$ 283