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Reorganization - Summary of Rolls Forward of Activity in Reorganization Accrual (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Restructuring Cost and Reserve [Line Items]    
Additions $ 3,424us-gaap_RestructuringCharges $ 849us-gaap_RestructuringCharges
Workforce Reduction [Member]    
Restructuring Cost and Reserve [Line Items]    
Accrual Beginning Balance 118us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
 
Additions 3,424us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
 
Cash payments (1,046)us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
 
Accrual Ending Balance $ 2,496us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember