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Restructuring Charges - Accrual for Severance and Related Costs (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Restructuring And Related Activities [Abstract]        
Beginning of Period $ 2,984 $ 2,719 $ 3,644 $ 6,356
Severance and related charges 6 2,446 6 2,765
Payments (354) [1] (978) [1] (784) [1] (4,836) [1]
Non-cash adjustments (18) [2] (155) [2] (248) [2] (253) [2]
End of Period $ 2,618 $ 4,032 $ 2,618 $ 4,032
[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.