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Income Taxes - Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Beginning balance, unrecognized tax benefits	$ (94,915)	$ (92,538)
Gross increases - tax positions in prior period	(1,400)	(514)
Gross decreases - tax positions in prior period	23,896	358
Gross increases - current-period tax positions	(4,142)	(4,237)
Decreases relating to settlements	34,259	2,541
Reductions as a result of lapse of statute of limitations	6,497	235
Foreign exchange movement	(21)	(760)
Ending balance, unrecognized tax benefits	$ (35,826)	$ (94,915)

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Unrecognized tax benefits increase decreases resulting from foreign currency translation.

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Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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-Name Accounting Standards Codification
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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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