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Currency Transaction Gains (Losses) (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Currency Transaction Gains (Losses) [Line Items] |  |  |
Net transaction gains (losses) | $ 46,887 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | $ 37,572 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | $ 63,519 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Operating income |  |  |
Currency Transaction Gains (Losses) [Line Items] |  |  |
Net transaction gains (losses) | 44,060 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingIncomeLossMember | 38,842 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingIncomeLossMember | 61,956 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingIncomeLossMember
Other non-operating income (expense), net |  |  |
Currency Transaction Gains (Losses) [Line Items] |  |  |
Net transaction gains (losses) | $ 2,827 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherNonoperatingIncomeExpenseMember | $ (1,270)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherNonoperatingIncomeExpenseMember | $ 1,563 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherNonoperatingIncomeExpenseMember

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- Definition 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 + Details
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