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Information Related to Effect of Derivative Instruments on Our Consolidated Condensed Statements of Income (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Derivative Instruments Gain Loss [Line Items] |  |
Gain (loss) on derivatives | $ 2,121 | $ 2,215
Commodity Derivatives |  |
Derivative Instruments Gain Loss [Line Items] |  |
Gain (loss) on derivatives | (73) | 51
Other comprehensive income | Foreign Currency Derivatives |  |
Derivative Instruments Gain Loss [Line Items] |  |
Gain (loss) on derivatives | 2,112 | 2,960
Other comprehensive income | Commodity Derivatives |  |
Derivative Instruments Gain Loss [Line Items] |  |
Gain (loss) on derivatives | (218) | 32
Cost of sales | Foreign Currency Derivatives |  |
Derivative Instruments Gain Loss [Line Items] |  |
Gain (loss) on derivatives | (81) | (472)
Cost of sales | Commodity Derivatives |  |
Derivative Instruments Gain Loss [Line Items] |  |
Gain (loss) on derivatives | 145 | 19
Selling, general and administrative expense | Foreign Currency Derivatives |  |
Derivative Instruments Gain Loss [Line Items] |  |
Gain (loss) on derivatives | 53 | (216)
Foreign currency (loss) gain | Foreign Currency Derivatives |  |
Derivative Instruments Gain Loss [Line Items] |  |
Gain (loss) on derivatives | $ 37 | $ (57)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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