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Foreign Currency Transaction Gains and Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Currency Transaction Gains (Losses) [Line Items] |  |  |  |  |
Net transaction gains (losses) | $ 1,613 | $ (49,345) |  | $ (39,505) | $ (114,469)
Operating income (loss) |  |  |  |  |
Currency Transaction Gains (Losses) [Line Items] |  |  |  |  |
Net transaction gains (losses) | 2,857 | (48,076) |  | (32,137) | (85,081)
Other non-operating expense, net |  |  |  |  |
Currency Transaction Gains (Losses) [Line Items] |  |  |  |  |
Net transaction gains (losses) | $ (1,244) | $ (1,269) |  | $ (7,368) | $ (29,388)
Venezuelan bolívar fuerte |  |  |  |  |
Currency Transaction Gains (Losses) [Line Items] |  |  |  |  |
Unrealized loss on foreign currency exchange |  |  | $ 26,000 |  |

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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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