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Restructuring Charges - Accrual for Severance and Related Costs (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Schedule Of Impairment Severance And Other Costs [Line Items]  
Balance as of December 31, 2012 $ 10,234
Severance & related charges 2,864
Payments (5,603)
Non-cash adjustments (116)
Balance as of June 30, 2013 $ 7,379