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Restructuring Charges - Accrual for Severance and Related Costs (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Restructuring And Related Activities [Abstract]    
Beginning of Period $ 4,913 $ 7,931
Severance and related charges    364
Payments (593) [1] (4,060) [1]
Non-cash adjustments (278) [2] (73) [2]
End of Period $ 4,042 $ 4,162
[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.