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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