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LONG-TERM INVESTMENTS (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Oct. 31, 2012
Schedule of Cost-method Investments [Line Items]        
Impairment loss on cost method investment $ 1,999,999us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment $ 2,000,000us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment     
U4iA [Member]        
Schedule of Cost-method Investments [Line Items]        
Ownership interest 2.40%kz_CostMethodInvestmentsOwnershipInterest
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kz_CompanyAcquiredThreeMember
     
Cost of investment 2,000,000us-gaap_CostMethodInvestmentsOriginalCost
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kz_CompanyAcquiredThreeMember
     
Impairment loss on cost method investment   2,000,000us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kz_CompanyAcquiredThreeMember
   
Meteor [Member]        
Schedule of Cost-method Investments [Line Items]        
Ownership interest 1.20%kz_CostMethodInvestmentsOwnershipInterest
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kz_CompanyAcquiredFourMember
    2.50%kz_CostMethodInvestmentsOwnershipInterest
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kz_CompanyAcquiredFourMember
Cost of investment 2,000,000us-gaap_CostMethodInvestmentsOriginalCost
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kz_CompanyAcquiredFourMember
     
Impairment loss on cost method investment $ 2,000,000us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kz_CompanyAcquiredFourMember