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INCOME TAXES (Tax Holidays) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
INCOME TAXES [Abstract]      
Increase in income tax expense $ 1,758,665kz_IncreaseDecreaseInIncomeTaxExpenseTaxHoliday $ 1,399,105kz_IncreaseDecreaseInIncomeTaxExpenseTaxHoliday $ 2,207,096kz_IncreaseDecreaseInIncomeTaxExpenseTaxHoliday
Impact on net income per ordinary share-basic $ 0.00kz_ImpactOnNetIncomeLossPerOrdinaryShareBasicTaxHoliday $ 0.00kz_ImpactOnNetIncomeLossPerOrdinaryShareBasicTaxHoliday $ 0.00kz_ImpactOnNetIncomeLossPerOrdinaryShareBasicTaxHoliday
Impact on net income per ordinary share-diluted $ 0.00kz_ImpactOnNetIncomeLossPerOrdinaryShareDilutedTaxHoliday $ 0.00kz_ImpactOnNetIncomeLossPerOrdinaryShareDilutedTaxHoliday $ 0.00kz_ImpactOnNetIncomeLossPerOrdinaryShareDilutedTaxHoliday