Restructuring Charges - Schedule of Changes in Future Minimum Lease Obligations (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Restructuring And Related Activities [Abstract]
Balance, Beginning of Period	$ 34,410	$ 11,618	$ 36,814	$ 12,892
Charges Incurred	749	5,984	5,206	9,082
Net Cash Payments	(8,403)	(2,723)	(14,402)	(8,000)
Other	353	2,261	(509)	3,166
Balance, End of Period	$ 27,109	$ 17,140	$ 27,109	$ 17,140