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Restructuring Charges - Accrual for Severance and Related Costs (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Restructuring And Related Activities [Abstract]        
Balance, Beginning of Period $ 6,624 $ 14,353 $ 8,686 $ 18,985
Severance & Related Charges [1],[2]   57   272
Payments (1,562) (2,305) (3,451) (7,630)
Non-cash Adjustments [3] (93) (815) (266) (337)
Balance, End of Period $ 4,969 $ 11,290 $ 4,969 $ 11,290
[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 payments 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.