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Currency Transaction Gains (Losses) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Currency Transaction Gains (Losses) [Line Items]
Net transaction gains (losses)	$ 10,979us-gaap_ForeignCurrencyTransactionGainLossBeforeTax	$ 7,137us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Operating income
Currency Transaction Gains (Losses) [Line Items]
Net transaction gains (losses)	11,904us-gaap_ForeignCurrencyTransactionGainLossBeforeTax / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingIncomeLossMember	8,069us-gaap_ForeignCurrencyTransactionGainLossBeforeTax / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingIncomeLossMember
Other non-operating expense, net
Currency Transaction Gains (Losses) [Line Items]
Net transaction gains (losses)	$ (925)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherNonoperatingIncomeExpenseMember	$ (932)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherNonoperatingIncomeExpenseMember

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 20

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30700-110894

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