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Foreign Currency Transaction Gains and Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Currency Transaction Gains (Losses) [Line Items] |  |  |  |
Net transaction (losses) gains | $ (12,985) | $ (26,293) | $ (41,118) | $ (65,124)
Operating loss |  |  |  |
Currency Transaction Gains (Losses) [Line Items] |  |  |  |
Net transaction (losses) gains | (6,845) | (25,163) | (34,994) | (37,005)
Other non-operating (expense) income, net |  |  |  |
Currency Transaction Gains (Losses) [Line Items] |  |  |  |
Net transaction (losses) gains | $ (6,140) | (1,130) | $ (6,124) | $ (28,119)
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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