Restructuring Charges - Schedule of Changes in Future Minimum Lease Obligations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Restructuring And Related Activities [Abstract]
Balance, Beginning of Period	$ 17,140	$ 5,480	$ 12,892	$ 7,094
Charges Incurred	4,912	11,107	13,994	17,527
Net Cash Payments	(3,476)	(6,399)	(11,476)	(16,112)
Other	1,303	2,242	4,469	3,921
Balance, End of Period	$ 19,879	$ 12,430	$ 19,879	$ 12,430