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SUBSEQUENT EVENT (Details) (Subsequent Event [Member], Forgame Holdings Limited [Member])
Share data in Millions, unless otherwise specified
Jan. 31, 2015
USD ($)
Jan. 31, 2015
HKD
Subsequent Event [Line Items]    
Cost of investment $ 16,400,000us-gaap_CostMethodInvestmentsOriginalCost
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kz_ForgameHoldingsLimitedMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
124,506,200us-gaap_CostMethodInvestmentsOriginalCost
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kz_ForgameHoldingsLimitedMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Ownership interest 7.00%kz_CostMethodInvestmentsOwnershipInterest
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kz_ForgameHoldingsLimitedMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
7.00%kz_CostMethodInvestmentsOwnershipInterest
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kz_ForgameHoldingsLimitedMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Number of shares owned 8.89kz_CostMethodInvestmentsNumberOfShareOwned
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kz_ForgameHoldingsLimitedMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
8.89kz_CostMethodInvestmentsNumberOfShareOwned
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kz_ForgameHoldingsLimitedMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember