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CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY (Schedule of Condensed Statements of Comprehensive Income) (Details) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 USD ($) | Dec. 31, 2014 CNY | Dec. 31, 2013 CNY | Dec. 31, 2012 CNY | Dec. 31, 2014 Parent Company [Member] USD ($) | Dec. 31, 2014 Parent Company [Member] CNY | Dec. 31, 2013 Parent Company [Member] CNY | Dec. 31, 2012 Parent Company [Member] CNY
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Net Revenues |  |  |  |  |  |  |  |
Operating expenses: |  |  |  |  |  |  |  |
Sales and marketing | (28,025)us-gaap_SellingAndMarketingExpense | (173,883)us-gaap_SellingAndMarketingExpense | (84,596)us-gaap_SellingAndMarketingExpense | (45,794)us-gaap_SellingAndMarketingExpense | (34)us-gaap_SellingAndMarketingExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (214)us-gaap_SellingAndMarketingExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
General and administrative | (25,192)us-gaap_GeneralAndAdministrativeExpense | (156,309)us-gaap_GeneralAndAdministrativeExpense | (73,190)us-gaap_GeneralAndAdministrativeExpense | (57,784)us-gaap_GeneralAndAdministrativeExpense | (1,914)us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (11,875)us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (952)us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (608)us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Write-off of deferred offering expenses | (522)us-gaap_WriteOffOfDeferredDebtIssuanceCost | (3,241)us-gaap_WriteOffOfDeferredDebtIssuanceCost |  | (6,404)us-gaap_WriteOffOfDeferredDebtIssuanceCost | (522)us-gaap_WriteOffOfDeferredDebtIssuanceCost / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (3,241)us-gaap_WriteOffOfDeferredDebtIssuanceCost / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (2,230)us-gaap_WriteOffOfDeferredDebtIssuanceCost / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total operating expenses |  |  |  |  | (2,470)us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (15,330)us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (952)us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (2,838)us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other operating expenses | (730)us-gaap_OtherCostAndExpenseOperating | (4,527)us-gaap_OtherCostAndExpenseOperating | (2,678)us-gaap_OtherCostAndExpenseOperating | (1,821)us-gaap_OtherCostAndExpenseOperating |  |  |  | (4)us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating profit | 24,097 us-gaap_OperatingIncomeLoss | 149,507 us-gaap_OperatingIncomeLoss | 59,918 us-gaap_OperatingIncomeLoss | 21,112 us-gaap_OperatingIncomeLoss | (2,470)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (15,330)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (952)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (2,842)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest income | 2,741 us-gaap_InvestmentIncomeInterest | 17,009 us-gaap_InvestmentIncomeInterest | 2,058 us-gaap_InvestmentIncomeInterest | 1,132 us-gaap_InvestmentIncomeInterest | 1,760 us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 10,920 us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 246 us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Interest expense | (57)us-gaap_InterestExpense | (356)us-gaap_InterestExpense | (5,407)us-gaap_InterestExpense |  |  |  | (4,712)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Changes in fair value of derivative component of the convertible note |  |  | (26,809)us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet |  |  |  | (26,809)us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Equity in profits of subsidiaries and VIEs |  |  |  |  | 26,023 wbai_EquityInProfitsForVariableInterestEntityAndSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 161,459 wbai_EquityInProfitsForVariableInterestEntityAndSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 120,741 wbai_EquityInProfitsForVariableInterestEntityAndSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 14,618 wbai_EquityInProfitsForVariableInterestEntityAndSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income before income tax | 26,600 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 165,036 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 29,760 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 22,244 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 25,313 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 157,049 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 88,514 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 11,776 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income tax benefit (expense) | (1,287)us-gaap_IncomeTaxExpenseBenefit | (7,987)us-gaap_IncomeTaxExpenseBenefit | 76,294 us-gaap_IncomeTaxExpenseBenefit | (18,001)us-gaap_IncomeTaxExpenseBenefit |  |  | 17,540 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (7,533)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income | 25,313 us-gaap_NetIncomeLoss | 157,049 us-gaap_NetIncomeLoss | 106,054 us-gaap_NetIncomeLoss | 4,243 us-gaap_NetIncomeLoss | 25,313 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 157,049 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 106,054 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,243 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other comprehensive income (loss), Foreign currency translation gain (loss) | 1,957 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax | 12,145 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax | (5,496)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax | 58 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax | 1,957 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 12,145 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (5,496)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 58 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Comprehensive income | $ 27,270 us-gaap_ComprehensiveIncomeNetOfTax | 169,194 us-gaap_ComprehensiveIncomeNetOfTax | 100,558 us-gaap_ComprehensiveIncomeNetOfTax | 4,301 us-gaap_ComprehensiveIncomeNetOfTax | $ 27,270 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 169,194 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 100,558 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,301 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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