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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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Currency Transaction Gains (Losses) [Line Items]

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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

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Amount before tax of foreign currency transaction unrealized gain (loss) recognized in the income statement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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