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Restructuring Charges - Summary of Accrued Restructuring Charges (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]    
Restructuring charge adjustments $ 4,837us-gaap_RestructuringReserveAccrualAdjustment  
Cash payments for restructuring charges (4,837)us-gaap_PaymentsForRestructuring  
Restructuring charges [Member]    
Restructuring Cost and Reserve [Line Items]    
Accrued restructuring charge, beginning balance 5,679us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_RestructuringChargesMember
7,680us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_RestructuringChargesMember
Accretion expense 137us-gaap_AccretionExpense
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_RestructuringChargesMember
416us-gaap_AccretionExpense
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_RestructuringChargesMember
Restructuring charge adjustments (4,837)us-gaap_RestructuringReserveAccrualAdjustment
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_RestructuringChargesMember
 
Cash payments for restructuring charges (979)us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_RestructuringChargesMember
(2,417)us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_RestructuringChargesMember
Accrued restructuring charge, ending balance   $ 5,679us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_RestructuringChargesMember