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RELATED PARTY TRANSACTIONS (Details) (Prosten Technology Holdings Limited [Member], USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Related Party Transaction [Line Items]      
Mobile value-added services $ 100,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty $ 1,000,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty $ 1,500,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Accounts payable to Prosten and its subsidiaries $ 198,051us-gaap_AccountsPayableRelatedPartiesCurrent $ 73,216us-gaap_AccountsPayableRelatedPartiesCurrent  
Leilei Wang [Member]      
Related Party Transaction [Line Items]      
Equity Method Investment, Ownership Percentage 10.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= kz_ShareholderNomineeOwnerFifteenMember