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INCOME TAXES (Reconciliation of Tax Computed Applying Statutory Income Tax Rate) (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
INCOME TAXES [Abstract]
Income before income taxes	$ 26,600us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	165,036us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	29,760us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	22,244us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax computed at applicable tax rates (25%)	6,650us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	41,259us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	7,440us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	5,561us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Effect of different tax rates in different jurisdictions	212us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	1,313us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	8,134us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	755us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Non-deductible expenses	4,529us-gaap_IncomeTaxReconciliationNondeductibleExpense	28,103us-gaap_IncomeTaxReconciliationNondeductibleExpense	15,810us-gaap_IncomeTaxReconciliationNondeductibleExpense	8,603us-gaap_IncomeTaxReconciliationNondeductibleExpense
Effect of tax holiday	(2,606)us-gaap_IncomeTaxReconciliationTaxHolidays	(16,170)us-gaap_IncomeTaxReconciliationTaxHolidays	(942)us-gaap_IncomeTaxReconciliationTaxHolidays	(8,449)us-gaap_IncomeTaxReconciliationTaxHolidays
Effect of tax rate changes	(6,245)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate	(38,747)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate	(15,581)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate	(3,076)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate
Change in valuation allowance	3us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	18us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	(1,900)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	1,621us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Change in interest and penalties on unrecognized tax benefits	(56)wbai_ChangeInInterestAndPenaltiesOnUnrecognizedTaxBenefits	(349)wbai_ChangeInInterestAndPenaltiesOnUnrecognizedTaxBenefits	2,222wbai_ChangeInInterestAndPenaltiesOnUnrecognizedTaxBenefits	544wbai_ChangeInInterestAndPenaltiesOnUnrecognizedTaxBenefits
Effect of EIT reversal for previous years	(1,250)us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes	(7,758)us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes	(2,741)us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes
Outside basis differences			(88,796)us-gaap_IncomeTaxReconciliationOtherAdjustments	11,919us-gaap_IncomeTaxReconciliationOtherAdjustments
Others	50us-gaap_IncomeTaxReconciliationOtherReconcilingItems	318us-gaap_IncomeTaxReconciliationOtherReconcilingItems	60us-gaap_IncomeTaxReconciliationOtherReconcilingItems	523us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Income tax expense (benefit)	$ 1,287us-gaap_IncomeTaxExpenseBenefit	7,987us-gaap_IncomeTaxExpenseBenefit	(76,294)us-gaap_IncomeTaxExpenseBenefit	18,001us-gaap_IncomeTaxExpenseBenefit

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- Definition

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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