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Restructuring Charges - Accrual for Severance and Related Costs (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Restructuring And Related Activities [Abstract]      
Balance, Beginning of Period $ 18,985 $ 2,712 $ 3,256
Severance and related charges [1],[2] 507 24,085 3,979
Payments (11,015) (7,518) (3,120)
Non-cash adjustments [3] 209 (294) (1,403)
Balance, End of Period $ 8,686 $ 18,985 $ 2,712
[1] Includes charges related to COBRA and outplacement services which are assumed to be completed by the third month following an employee’s departure.
[2] Severance charges will result in future cash expenditures through 2018.
[3] Includes cancellations due to employee departures prior to agreed upon end dates, employee transfers to open positions within the organization and subsequent adjustments to severance and related costs.