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Restructuring Charges - Accrual for Severance and Related Costs (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Restructuring and Related Activities [Abstract]    
Beginning of Period $ 3,243us-gaap_RestructuringReserve $ 5,574us-gaap_RestructuringReserve
Severance and related charges 3,524us-gaap_RestructuringCharges [1] 5,084us-gaap_RestructuringCharges [1]
Payments (2,885)us-gaap_PaymentsForRestructuring (6,665)us-gaap_PaymentsForRestructuring
Non-cash adjustments (1,181)us-gaap_RestructuringReserveAccrualAdjustment [2] (750)us-gaap_RestructuringReserveAccrualAdjustment [2]
End of Period $ 2,701us-gaap_RestructuringReserve $ 3,243us-gaap_RestructuringReserve
[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.