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GOODWILL (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Goodwill [Line Items]      
Gross amount: Beginning balance 135,424,953us-gaap_GoodwillGross 132,611,729us-gaap_GoodwillGross  
Exchange differences (259,072)us-gaap_GoodwillTranslationAdjustments 2,813,224us-gaap_GoodwillTranslationAdjustments  
Gross amount: Ending balance 135,165,881us-gaap_GoodwillGross 135,424,953us-gaap_GoodwillGross  
Accumulated impairment loss: Beginning balance (45,158,324)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss (45,060,706)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss  
Exchange differences 11,551us-gaap_GoodwillImpairedAdjustmentToInitialEstimateAmount (97,618)us-gaap_GoodwillImpairedAdjustmentToInitialEstimateAmount  
Accumulated impairment loss: Ending balance (45,146,773)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss (45,158,324)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss  
Goodwill, net 90,019,108us-gaap_Goodwill 90,266,629us-gaap_Goodwill  
Internet Games [Member]      
Goodwill [Line Items]      
Gross amount: Beginning balance 70,506,823us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= kz_InternetGamesMember
68,408,299us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= kz_InternetGamesMember
 
Exchange differences (191,276)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= kz_InternetGamesMember
2,098,524us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= kz_InternetGamesMember
 
Gross amount: Ending balance 70,315,547us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= kz_InternetGamesMember
70,506,823us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= kz_InternetGamesMember
 
Accumulated impairment loss: Beginning balance (3,279,803)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= kz_InternetGamesMember
(3,182,185)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= kz_InternetGamesMember
 
Exchange differences 8,898us-gaap_GoodwillImpairedAdjustmentToInitialEstimateAmount
/ us-gaap_StatementBusinessSegmentsAxis
= kz_InternetGamesMember
(97,618)us-gaap_GoodwillImpairedAdjustmentToInitialEstimateAmount
/ us-gaap_StatementBusinessSegmentsAxis
= kz_InternetGamesMember
 
Accumulated impairment loss: Ending balance (3,270,905)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= kz_InternetGamesMember
(3,279,803)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= kz_InternetGamesMember
 
Goodwill, net 67,044,642us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= kz_InternetGamesMember
67,227,020us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= kz_InternetGamesMember
 
Internet Games [Member] | Goodwill [Member]      
Goodwill [Line Items]      
Discounted cash flow rate 27.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_InternetGamesMember
27.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_InternetGamesMember
26.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_InternetGamesMember
Terminal value growth rate 3.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_InternetGamesMember
3.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_InternetGamesMember
3.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_InternetGamesMember
Mobile Games [Member]      
Goodwill [Line Items]      
Gross amount: Beginning balance 20,882,730us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= kz_MobileGamesMember
20,274,048us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= kz_MobileGamesMember
 
Exchange differences (55,479)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= kz_MobileGamesMember
608,682us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= kz_MobileGamesMember
 
Gross amount: Ending balance 20,827,251us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= kz_MobileGamesMember
20,882,730us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= kz_MobileGamesMember
 
Accumulated impairment loss: Beginning balance        
Exchange differences        
Accumulated impairment loss: Ending balance        
Goodwill, net 20,827,251us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= kz_MobileGamesMember
20,882,730us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= kz_MobileGamesMember
 
Mobile Games [Member] | Goodwill [Member]      
Goodwill [Line Items]      
Discounted cash flow rate 26.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_MobileGamesMember
25.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_MobileGamesMember
24.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_MobileGamesMember
Terminal value growth rate 3.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_MobileGamesMember
3.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_MobileGamesMember
1.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_MobileGamesMember
WVAS [Member]      
Goodwill [Line Items]      
Gross amount: Beginning balance 44,035,400us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
43,929,382us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
 
Exchange differences (12,317)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
106,018us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
 
Gross amount: Ending balance 44,023,083us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
44,035,400us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
 
Accumulated impairment loss: Beginning balance (41,878,521)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
(41,878,521)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
 
Exchange differences 2,653us-gaap_GoodwillImpairedAdjustmentToInitialEstimateAmount
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
    
Accumulated impairment loss: Ending balance (41,875,868)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
(41,878,521)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
 
Goodwill, net 2,147,215us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
2,156,879us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
 
WVAS [Member] | Goodwill [Member]      
Goodwill [Line Items]      
Discounted cash flow rate 26.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
26.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
25.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
Terminal value growth rate 1.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
1.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
1.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember