Income Taxes - Reconciliation of Total Gross Liability Related to Uncertain Tax Positions (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning Balance	$ 29,143us-gaap_UnrecognizedTaxBenefits	$ 28,398us-gaap_UnrecognizedTaxBenefits	$ 29,789us-gaap_UnrecognizedTaxBenefits
Additions for tax positions related to prior years	0	0	4,242
Reductions for tax positions related to prior years	(214)	(348)	0
Additions for tax positions related to current year	2,232	2,061	3,639
Lapses in statutes of limitations	(5,057)	(473)	(10,057)
Foreign currency translation adjustment	(1,135)	(495)	785
Ending Balance	$ 24,969us-gaap_UnrecognizedTaxBenefits	$ 29,143us-gaap_UnrecognizedTaxBenefits	$ 28,398us-gaap_UnrecognizedTaxBenefits

Unrecognized Tax Benefits Foreign Currency Translation Adjustments

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- Definition

Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

-URI http://asc.fasb.org/extlink&oid=6527854

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-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

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-Paragraph 15A

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-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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