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Derivatives - Summary of Fair Value Amounts of Company's Derivative Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Forward exchange contracts, assets	$ 1,966us-gaap_ForeignCurrencyCashFlowHedgeAssetAtFairValue	$ 920us-gaap_ForeignCurrencyCashFlowHedgeAssetAtFairValue
Forward exchange contracts, liabilities		(656)us-gaap_ForeignCurrencyCashFlowHedgeLiabilityAtFairValue
Total net derivative asset designated as hedging instruments	1,966us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet	264us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet
Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Forward exchange contracts, assets	1,966us-gaap_ForeignCurrencyCashFlowHedgeAssetAtFairValue / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	920us-gaap_ForeignCurrencyCashFlowHedgeAssetAtFairValue / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Forward exchange contracts, liabilities		(656)us-gaap_ForeignCurrencyCashFlowHedgeLiabilityAtFairValue / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Total net derivative asset designated as hedging instruments	$ 1,966us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	$ 264us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember

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- Definition

Fair value as of the balance sheet date of all foreign currency derivative assets designated as cash flow hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value as of the balance sheet date of all foreign currency derivatives designated as cash flow hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(b),(c)(1)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value as of the balance sheet date of all foreign currency derivative liabilities designated as cash flow hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959

+ Details

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Period Type:	instant

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