Restructuring, Asset Impairment, and Transition Expenses - Reconciliation of Accrued Restructuring Costs (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Restructuring Reserve [Roll Forward]
Beginning Balance			$ 2,211
Restructuring expense incurred	$ 1,641	$ 2,587	3,194	$ 4,343
Non-cash loss on impairment of fixed assets			(448)
Cash payments			(3,005)
Ending Balance	$ 1,952		$ 1,952