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Restructuring Charges - Schedule of Changes in Future Minimum Lease Obligations (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Restructuring And Related Activities [Abstract]        
Balance, Beginning of Period $ 27,109 $ 17,140 $ 36,814 $ 12,892
Charges Incurred 9,422 4,912 14,628 13,994
Net Cash Payments (9,094) (3,476) (23,496) (11,476)
Other 2,932 1,303 2,423 4,469
Balance, End of Period $ 30,369 $ 19,879 $ 30,369 $ 19,879