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LOANS TO THIRD PARTY (Details) (Chengdu Jinhua [Member])
0 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended
Feb. 18, 2011
CNY
Feb. 18, 2011
USD ($)
Feb. 18, 2011
CNY
Dec. 31, 2012
USD ($)
Jan. 24, 2011
Loan One [Member]
CNY
Jan. 24, 2011
Loan Two [Member]
CNY
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Cash used to fund loans to third parties 15,000,000us-gaap_PaymentsToAcquireLoansReceivable
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= kz_ThirdPartyOneMember
$ 22,200,000us-gaap_PaymentsToAcquireLoansReceivable
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= kz_ThirdPartyOneMember
139,800,000us-gaap_PaymentsToAcquireLoansReceivable
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= kz_ThirdPartyOneMember
  99,000,000us-gaap_PaymentsToAcquireLoansReceivable
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= kz_ThirdPartyOneMember
/ us-gaap_FinancialInstrumentAxis
= kz_LoanOneMember
25,800,000us-gaap_PaymentsToAcquireLoansReceivable
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= kz_ThirdPartyOneMember
/ us-gaap_FinancialInstrumentAxis
= kz_LoanTwoMember
Third party loan, interest rate 6.39%us-gaap_ReceivableWithImputedInterestEffectiveYieldInterestRate
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= kz_ThirdPartyOneMember
    7.93%us-gaap_ReceivableWithImputedInterestEffectiveYieldInterestRate
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= kz_ThirdPartyOneMember
6.39%us-gaap_ReceivableWithImputedInterestEffectiveYieldInterestRate
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= kz_ThirdPartyOneMember
/ us-gaap_FinancialInstrumentAxis
= kz_LoanOneMember
6.39%us-gaap_ReceivableWithImputedInterestEffectiveYieldInterestRate
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= kz_ThirdPartyOneMember
/ us-gaap_FinancialInstrumentAxis
= kz_LoanTwoMember
Interest income from loans to third party       $ 453,602us-gaap_InterestAndOtherIncome
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= kz_ThirdPartyOneMember