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Derivative Financial Instruments - Additional Information (Detail) (Forward Contracts [Member], Maximum [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Forward Contracts [Member] | Maximum [Member]
 
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Foreign currency forward contracts $ 1us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember