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Restructuring Charges - Schedule of Changes in Future Minimum Lease Obligations (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Restructuring And Related Activities [Abstract]    
Balance, Beginning of Period $ 36,814 $ 12,892
Charges Incurred 4,457 3,098
Net Cash Payments (5,999) (5,277)
Other (862) 905
Balance, End of Period $ 34,410 $ 11,618