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PRC CONTRIBUTION PLAN AND PROFIT APPROPRIATION (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
PRC CONTRIBUTION PLAN AND PROFIT APPROPRIATION [Abstract]      
Provision for employee benefits $ 4,799,750us-gaap_DefinedContributionPlanCostRecognized $ 5,135,732us-gaap_DefinedContributionPlanCostRecognized $ 3,480,839us-gaap_DefinedContributionPlanCostRecognized
General reserve fund appropriations, percent of profit 10.00%kz_GeneralReserveFundAppropriationsPercentOfProfit    
Statutory reserves $ 11,467,537us-gaap_RetainedEarningsAppropriated $ 10,723,748us-gaap_RetainedEarningsAppropriated