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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
	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	24,097us-gaap_OperatingIncomeLoss	149,507us-gaap_OperatingIncomeLoss	59,918us-gaap_OperatingIncomeLoss	21,112us-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	2,741us-gaap_InvestmentIncomeInterest	17,009us-gaap_InvestmentIncomeInterest	2,058us-gaap_InvestmentIncomeInterest	1,132us-gaap_InvestmentIncomeInterest	1,760us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	10,920us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	246us-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					26,023wbai_EquityInProfitsForVariableInterestEntityAndSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	161,459wbai_EquityInProfitsForVariableInterestEntityAndSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	120,741wbai_EquityInProfitsForVariableInterestEntityAndSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	14,618wbai_EquityInProfitsForVariableInterestEntityAndSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income before income tax	26,600us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	165,036us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	29,760us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	22,244us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	25,313us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	157,049us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	88,514us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	11,776us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income tax benefit (expense)	(1,287)us-gaap_IncomeTaxExpenseBenefit	(7,987)us-gaap_IncomeTaxExpenseBenefit	76,294us-gaap_IncomeTaxExpenseBenefit	(18,001)us-gaap_IncomeTaxExpenseBenefit			17,540us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(7,533)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income	25,313us-gaap_NetIncomeLoss	157,049us-gaap_NetIncomeLoss	106,054us-gaap_NetIncomeLoss	4,243us-gaap_NetIncomeLoss	25,313us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	157,049us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	106,054us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	4,243us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other comprehensive income (loss), Foreign currency translation gain (loss)	1,957us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	12,145us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	(5,496)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	58us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	1,957us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	12,145us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(5,496)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	58us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Comprehensive income	$ 27,270us-gaap_ComprehensiveIncomeNetOfTax	169,194us-gaap_ComprehensiveIncomeNetOfTax	100,558us-gaap_ComprehensiveIncomeNetOfTax	4,301us-gaap_ComprehensiveIncomeNetOfTax	$ 27,270us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	169,194us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	100,558us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	4,301us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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