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Supplemental Financial Information - Currency Transaction Gains (Losses) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Currency Transaction Gains (Losses) [Line Items] |  |  |
Net transaction losses | $ (36,203) | $ (191,332) | $ (34,006)
Operating (loss) income |  |  |
Currency Transaction Gains (Losses) [Line Items] |  |  |
Net transaction losses | (29,678) | (164,042) | (25,715)
Other non-operating (expense) income, net |  |  |
Currency Transaction Gains (Losses) [Line Items] |  |  |
Net transaction losses | $ (6,525) | $ (27,290) | $ (8,291)

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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 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 2: 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=64836518&loc=d3e30700-110894 Reference 3: 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=64836518&loc=d3e30690-110894 + Details
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