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Foreign Currency Transaction Gains and Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	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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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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-Publisher FASB
-Name Accounting Standards Codification
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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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