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SEGMENT AND GEOGRAPHIC INFORMATION (Service Lines of WVAS) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenue from External Customer [Line Items]      
Revenues $ 227,595,969us-gaap_SalesRevenueNet $ 173,653,795us-gaap_SalesRevenueNet $ 180,586,151us-gaap_SalesRevenueNet
WVAS [Member]      
Revenue from External Customer [Line Items]      
Revenues 64,459,705us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
62,953,219us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
76,712,323us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
WVAS [Member] | SMS [Member]      
Revenue from External Customer [Line Items]      
Revenues 31,922,975us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= kz_ProductLineThreeMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
31,844,446us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= kz_ProductLineThreeMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
38,647,552us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= kz_ProductLineThreeMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
WVAS [Member] | IVR [Member]      
Revenue from External Customer [Line Items]      
Revenues 13,210,504us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= kz_ProductLineFourMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
14,658,612us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= kz_ProductLineFourMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
13,255,971us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= kz_ProductLineFourMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
WVAS [Member] | MMS [Member]      
Revenue from External Customer [Line Items]      
Revenues 968,026us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= kz_ProductLineTwoMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
1,096,133us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= kz_ProductLineTwoMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
3,346,206us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= kz_ProductLineTwoMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
WVAS [Member] | WAP [Member]      
Revenue from External Customer [Line Items]      
Revenues 364,750us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= kz_ProductLineOneMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
708,984us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= kz_ProductLineOneMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
2,651,647us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= kz_ProductLineOneMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
WVAS [Member] | CRBT and Others [Member]      
Revenue from External Customer [Line Items]      
Revenues $ 17,993,450us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= kz_ProductLineFiveMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
$ 14,645,044us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= kz_ProductLineFiveMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember
$ 18,810,947us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= kz_ProductLineFiveMember
/ us-gaap_StatementBusinessSegmentsAxis
= kz_WvasMember