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Restructuring - Schedule of Company's Restructuring Activity (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Restructuring and Related Activities [Abstract]      
Charged to expense $ 2,464us-gaap_RestructuringCharges $ 1,364us-gaap_RestructuringCharges $ 343us-gaap_RestructuringCharges
Payments (2,372)us-gaap_PaymentsForRestructuring    
Balance at December 31 $ 92us-gaap_RestructuringReserve