Income Taxes - Schedule of Reconciliation of Uncertain Tax Positions (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Beginning balance of uncertain tax positions	$ 12,144	$ 14,002	$ 14,781
Additions related to current year tax positions			18
Reductions related to prior year tax positions		(8)
Settlements	(694)	(1,434)	(34)
Lapse of statute of limitations		(416)	(763)
Ending balance of uncertain tax positions	$ 11,450	$ 12,144	$ 14,002