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Restructuring Charges - Accrual for Severance and Related Costs (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Restructuring and Related Activities [Abstract]        
Beginning of Period $ 2,456 $ 2,657 $ 2,701 $ 3,243
Severance & Related Charges [1],[2] 12,636   13,380  
Payments (2,238) (308) (3,009) (694)
Non-cash Adjustments [3] (302) 17 (520) (183)
End of Period $ 12,552 $ 2,366 $ 12,552 $ 2,366
[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 payments 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.