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Derivatives - Summary of Fair Value Amounts of Company's Derivative Instruments (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Derivative asset classified in other current assets $ 1,966us-gaap_ForeignCurrencyCashFlowHedgeAssetAtFairValue $ 920us-gaap_ForeignCurrencyCashFlowHedgeAssetAtFairValue
Derivative liability classified in other current liabilities   $ (656)us-gaap_ForeignCurrencyCashFlowHedgeLiabilityAtFairValue