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Assets and Liabilities Carried at Fair Value Measured on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Other assets    
Assets:    
Available-for-sale securities $ 277us-gaap_AvailableForSaleSecurities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember		 $ 266us-gaap_AvailableForSaleSecurities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
Other Current Assets    
Assets:    
Derivative financial instruments 2,177us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember		 644us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
Fair Value Measurements, Level 1 | Other assets    
Assets:    
Available-for-sale securities 277us-gaap_AvailableForSaleSecurities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 266us-gaap_AvailableForSaleSecurities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Fair Value Measurements, Level 2 | Other Current Assets    
Assets:    
Derivative financial instruments $ 2,177us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 $ 644us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member