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Taxation - Summary of Aggregate Amount and Per Share Effect of Tax Holiday (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Aggregate dollar effect	$ 2,784us-gaap_IncomeTaxHolidayAggregateDollarAmount	$ 4,638us-gaap_IncomeTaxHolidayAggregateDollarAmount	$ 2,073us-gaap_IncomeTaxHolidayAggregateDollarAmount
Per share effect-basic	$ 0.01xnet_IncomeTaxHolidayIncomeTaxBenefitsPerShareBasic	$ 0.08xnet_IncomeTaxHolidayIncomeTaxBenefitsPerShareBasic	$ 0.03xnet_IncomeTaxHolidayIncomeTaxBenefitsPerShareBasic
Per share effect-diluted	$ 0.01xnet_IncomeTaxHolidayIncomeTaxBenefitsPerShareDiluted	$ 0.06xnet_IncomeTaxHolidayIncomeTaxBenefitsPerShareDiluted	$ 0.03xnet_IncomeTaxHolidayIncomeTaxBenefitsPerShareDiluted

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- Definition

The amount of income taxes from which a reporting entity is exempt or for which it will receive a reduction in income taxes as a result of the income tax holiday granted by the taxing jurisdiction.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 11.C)

-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330215-122817



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 11

-Section C

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- Definition

Income Tax Holiday, Income Tax Benefits Per Share Basic

+ References

No definition available.

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- Definition

Income Tax Holiday, Income Tax Benefits Per Share Diluted

+ References

No definition available.

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