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Restructuring Charges - Accrual for Severance and Related Costs (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Restructuring And Related Activities [Abstract]    
Beginning of Period $ 9,860 $ 253
Severance and related charges 6,218 13,996
Payments (9,120) [1] (2,299) [1]
Non-cash adjustments (1,233) [2] (2,090) [2]
End of Period $ 5,725 $ 9,860
[1] Includes payments related to COBRA and outplacement services which are assumed to be completed by the third month following an employee's departure.
[2] 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.