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ORGANIZATION (Schedule of Variable Interest Entity) (Details)
 12 Months Ended
Dec. 31, 2014
BVI [Member]  
Variable Interest Entity And Subsidiaries [Line Items]  
Date of establishment Feb. 09, 2011
Place of establishment British Virgin Islands
Percentage of ownership by the Company 100.00%wbai_VariableInterestEntityAndSubsidiariesOwnershipPercentage
/ dei_LegalEntityAxis
= wbai_FineBrandLimitedMember
Principal activities
Investment Holding
500wan HK [Member]  
Variable Interest Entity And Subsidiaries [Line Items]  
Date of establishment Mar. 08, 2011
Place of establishment Hong Kong
Percentage of ownership by the Company 100.00%wbai_SubsidiariesOwnershipPercentage
/ dei_LegalEntityAxis
= wbai_FiveHundredWanHkLimitedMember
Principal activities
Investment Holding
500.com USA [Member]  
Variable Interest Entity And Subsidiaries [Line Items]  
Date of establishment Jul. 21, 2014
Place of establishment USA
Percentage of ownership by the Company 100.00%wbai_SubsidiariesOwnershipPercentage
/ dei_LegalEntityAxis
= wbai_FiveHundredUsaCorporationMember
Principal activities
Investment Holding
E-Sun Sky Computer [Member]  
Variable Interest Entity And Subsidiaries [Line Items]  
Date of establishment Jun. 18, 2007
Place of establishment PRC
Percentage of ownership by the Company 100.00%wbai_SubsidiariesOwnershipPercentage
/ dei_LegalEntityAxis
= wbai_EsunSkyComputerShenzhenCoLtdMember
Principal activities
Software Service
E-Sun Network [Member] | Variable Interest Entity, Primary Beneficiary [Member]  
Variable Interest Entity And Subsidiaries [Line Items]  
Date of establishment Dec. 07, 1999
Place of establishment PRC
Percentage of ownership by the Company   
Principal activities
Online Lottery Service
Youlanguang Technology [Member] | Variable Interest Entity, Primary Beneficiary [Member]  
Variable Interest Entity And Subsidiaries [Line Items]  
Date of establishment Dec. 16, 2008
Place of establishment PRC
Percentage of ownership by the Company   
Principal activities
Online Lottery Service
Guangtiandi Technology [Member] | Variable Interest Entity, Primary Beneficiary [Member]  
Variable Interest Entity And Subsidiaries [Line Items]  
Date of establishment Dec. 16, 2008
Place of establishment PRC
Percentage of ownership by the Company   
Principal activities
Online Lottery Service
E-Sun Sky Network [Member] | Variable Interest Entity, Primary Beneficiary [Member]  
Variable Interest Entity And Subsidiaries [Line Items]  
Date of establishment May 22, 2006 [1]
Place of establishment PRC [1]
Percentage of ownership by the Company    [1]
Principal activities
Online Lottery Service
 [1]
500Fu [Member] | Variable Interest Entity, Primary Beneficiary [Member]  
Variable Interest Entity And Subsidiaries [Line Items]  
Date of establishment Apr. 23, 2014 [2]
Place of establishment PRC [2]
Percentage of ownership by the Company    [2]
Principal activities
Third party payment service
 [2]
Lhasa Yicai [Member] | Variable Interest Entity, Primary Beneficiary [Member]  
Variable Interest Entity And Subsidiaries [Line Items]  
Date of establishment Oct. 17, 2014 [2]
Place of establishment PRC [2]
Percentage of ownership by the Company    [2]
Principal activities
Online Lottery Service
 [2]
Baifengrun Technology [Member] | Variable Interest Entity, Primary Beneficiary [Member]  
Variable Interest Entity And Subsidiaries [Line Items]  
Date of establishment Jun. 13, 2014 [3]
Place of establishment PRC [3]
Percentage of ownership by the Company    [3]
Principal activities
Development, operation of
mobile phone games
 [3]
[1] A subsidiary of E-Sun Network
[2] A subsidiary of E-Sun Sky Network
[3] A subsidiary of Guangtiandi Technology