Restructuring, Asset Impairment, and Transition Expenses - Reconciliation of Accrued Restructuring Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 2,211	$ 389	$ 429
Restructuring expense incurred	9,849	7,214	1,767
Non-cash loss on impairment of fixed assets	(1,521)	(2,003)
Cash payments	(8,568)	(3,389)	(1,807)
Ending Balance	$ 1,971	$ 2,211	$ 389