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CONCENTRATIONS (Details)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Internet Games [Member] | Sales [Member] | Internet Game A [Member]      
Revenue, Major Customer [Line Items]      
Concentration risk, percentage 50.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ProductOrServiceAxis
= kz_InternetGameAMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_InternetGamesMember
51.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ProductOrServiceAxis
= kz_InternetGameAMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_InternetGamesMember
40.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ProductOrServiceAxis
= kz_InternetGameAMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_InternetGamesMember
China Mobile [Member] | Sales [Member]      
Revenue, Major Customer [Line Items]      
Concentration risk, percentage 27.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_MajorCustomersAxis
= kz_NameOfMajorCustomerOneMember
30.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_MajorCustomersAxis
= kz_NameOfMajorCustomerOneMember
36.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_MajorCustomersAxis
= kz_NameOfMajorCustomerOneMember
China Mobile [Member] | Accounts Receivable [Member]      
Revenue, Major Customer [Line Items]      
Concentration risk, percentage 58.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_MajorCustomersAxis
= kz_NameOfMajorCustomerOneMember
63.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_MajorCustomersAxis
= kz_NameOfMajorCustomerOneMember
 
China Mobile [Member] | Mobile Games [Member] | Sales [Member]      
Revenue, Major Customer [Line Items]      
Concentration risk, percentage 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_MajorCustomersAxis
= kz_NameOfMajorCustomerOneMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_MobileGamesMember
6.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_MajorCustomersAxis
= kz_NameOfMajorCustomerOneMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_MobileGamesMember
8.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_MajorCustomersAxis
= kz_NameOfMajorCustomerOneMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_MobileGamesMember
China Mobile [Member] | WVAS [Member] | Sales [Member]      
Revenue, Major Customer [Line Items]      
Concentration risk, percentage 17.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_MajorCustomersAxis
= kz_NameOfMajorCustomerOneMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
24.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_MajorCustomersAxis
= kz_NameOfMajorCustomerOneMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
28.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_MajorCustomersAxis
= kz_NameOfMajorCustomerOneMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
China Unicom [Member] | Sales [Member]      
Revenue, Major Customer [Line Items]      
Concentration risk, percentage 4.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_MajorCustomersAxis
= kz_NameOfMajorCustomerTwoMember
5.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_MajorCustomersAxis
= kz_NameOfMajorCustomerTwoMember
7.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_MajorCustomersAxis
= kz_NameOfMajorCustomerTwoMember
China Unicom [Member] | Accounts Receivable [Member]      
Revenue, Major Customer [Line Items]      
Concentration risk, percentage 7.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_MajorCustomersAxis
= kz_NameOfMajorCustomerTwoMember
9.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_MajorCustomersAxis
= kz_NameOfMajorCustomerTwoMember
 
China Unicom [Member] | Mobile Games [Member] | Sales [Member]      
Revenue, Major Customer [Line Items]      
Concentration risk, percentage         
China Unicom [Member] | WVAS [Member] | Sales [Member]      
Revenue, Major Customer [Line Items]      
Concentration risk, percentage 4.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_MajorCustomersAxis
= kz_NameOfMajorCustomerTwoMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
5.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_MajorCustomersAxis
= kz_NameOfMajorCustomerTwoMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
7.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_MajorCustomersAxis
= kz_NameOfMajorCustomerTwoMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
China Telecom [Member] | Sales [Member]      
Revenue, Major Customer [Line Items]      
Concentration risk, percentage 5.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_MajorCustomersAxis
= kz_NameOfMajorCustomerThreeMember
6.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_MajorCustomersAxis
= kz_NameOfMajorCustomerThreeMember
6.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_MajorCustomersAxis
= kz_NameOfMajorCustomerThreeMember
China Telecom [Member] | Accounts Receivable [Member]      
Revenue, Major Customer [Line Items]      
Concentration risk, percentage 9.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_MajorCustomersAxis
= kz_NameOfMajorCustomerThreeMember
9.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_MajorCustomersAxis
= kz_NameOfMajorCustomerThreeMember
 
China Telecom [Member] | Mobile Games [Member] | Sales [Member]      
Revenue, Major Customer [Line Items]      
Concentration risk, percentage         
China Telecom [Member] | WVAS [Member] | Sales [Member]      
Revenue, Major Customer [Line Items]      
Concentration risk, percentage 5.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_MajorCustomersAxis
= kz_NameOfMajorCustomerThreeMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
6.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_MajorCustomersAxis
= kz_NameOfMajorCustomerThreeMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
6.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_MajorCustomersAxis
= kz_NameOfMajorCustomerThreeMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember