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Restructuring Charges - Schedule of Changes in Future Minimum Lease Obligations (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Restructuring And Related Activities [Abstract]    
Balance, Beginning of Period $ 20,763 $ 36,814
Charges Incurred [1] 432 4,457
Net Cash Payments (5,352) (5,999)
Other [2]   (862)
Balance, End of Period $ 15,843 $ 34,410
[1] Includes charges for newly vacated spaces and subsequent adjustments for accretion, revised estimates and variances between estimated and actual charges, net of any reversals for terminated lease obligations.
[2] Includes existing prepaid rent and deferred rent liability balances for newly vacated spaces that offset the losses incurred in the period recorded.