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Financial instruments - after tax (gain)/loss reclassified from accumulated other comprehensive income into income (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Derivatives Fair Value [Line Items] |  |  |
Derivatives qualifying as hedges, net of tax | $ 0 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax | $ 381 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax | $ 6,876 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Interest Rate Swap |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivatives qualifying as hedges, net of tax | 0 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | 0 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | 7,032 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Foreign Currency Exchange Contracts |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivatives qualifying as hedges, net of tax | $ 0 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember | $ 381 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember | $ (156)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember

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- Definition Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 + Details
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