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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended |
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Dec. 31, 2014 USD ($) | Dec. 31, 2014 CNY | Dec. 31, 2013 CNY | Dec. 31, 2012 CNY | Dec. 31, 2014 Cost of Services [Member] USD ($) | Dec. 31, 2014 Cost of Services [Member] CNY | Dec. 31, 2013 Cost of Services [Member] CNY | Dec. 31, 2012 Cost of Services [Member] CNY | Dec. 31, 2014 China, Yuan Renminbi | Dec. 31, 2014 United States of America, Dollars
Summary Of Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Currency exchange rate |  |  |  |  |  |  |  |  | 6.2046 us-gaap_ForeignCurrencyExchangeRateTranslation1 / us-gaap_CurrencyAxis = currency_CNY | 1.00 us-gaap_ForeignCurrencyExchangeRateTranslation1 / us-gaap_CurrencyAxis = currency_USD
Cash and cash equivalents, maturities | three months or less | three months or less |  |  |  |  |  |  |  |
Time deposits, maturity | greater than three months but less than a year | greater than three months but less than a year |  |  |  |  |  |  |  |
Impairment charge of long-lived assets | $ 0 us-gaap_AssetImpairmentCharges | 0 us-gaap_AssetImpairmentCharges | 0 us-gaap_AssetImpairmentCharges | 0 us-gaap_AssetImpairmentCharges |  |  |  |  |  |
Business tax and surcharges |  |  |  |  | 1,321 us-gaap_TaxesOther / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 8,198 us-gaap_TaxesOther / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 7,526 us-gaap_TaxesOther / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 5,485 us-gaap_TaxesOther / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember |  |
Percentage of business taxes, surcharges and cultural development fees on revenue, minimum | 1.12%wbai_PercentageOfBusinessTaxRateSurchargeAndCulturalDevelopmentFeesOnRevenueMinimum | 1.12%wbai_PercentageOfBusinessTaxRateSurchargeAndCulturalDevelopmentFeesOnRevenueMinimum |  |  |  |  |  |  |  |
Percentage of business taxes, surcharges and cultural development fees on revenue, maximum | 2.97%wbai_PercentageOfBusinessTaxRateSurchargeAndCulturalDevelopmentFeesOnRevenueMaximum | 2.97%wbai_PercentageOfBusinessTaxRateSurchargeAndCulturalDevelopmentFeesOnRevenueMaximum |  |  |  |  |  |  |  |
Advertising costs | 5,559 us-gaap_AdvertisingExpense | 34,489 us-gaap_AdvertisingExpense | 30,759 us-gaap_AdvertisingExpense | 12,143 us-gaap_AdvertisingExpense |  |  |  |  |  |
Capital lease terms | For the lessee, a lease is a capital lease if any of the following conditions exist: a) ownership is transferred to the lessee by the end of the lease term, b) there is a bargain purchase option, c) the lease term is at least 75% of the properties estimated remaining economic life or d) the present value of the minimum lease payments at the beginning of the lease term is 90% or more of the fair value of the leased property to the lessor at the inception date. | For the lessee, a lease is a capital lease if any of the following conditions exist: a) ownership is transferred to the lessee by the end of the lease term, b) there is a bargain purchase option, c) the lease term is at least 75% of the properties estimated remaining economic life or d) the present value of the minimum lease payments at the beginning of the lease term is 90% or more of the fair value of the leased property to the lessor at the inception date. |  |  |  |  |  |  |  |
Capital lease obligation | 0 us-gaap_CapitalLeaseObligations | 0 us-gaap_CapitalLeaseObligations | 0 us-gaap_CapitalLeaseObligations | 0 us-gaap_CapitalLeaseObligations |  |  |  |  |  |
Income Tax Examination, Likelihood of Unfavorable Settlement | Tax positions that meet the “more likely than not” recognition threshold are measured at the largest amount of tax benefit, determined on a cumulative probability basis, that has a greater than fifty percent likelihood of being realized upon settlement | Tax positions that meet the “more likely than not” recognition threshold are measured at the largest amount of tax benefit, determined on a cumulative probability basis, that has a greater than fifty percent likelihood of being realized upon settlement |  |  |  |  |  |  |  |
Ordinary shares, par value | $ 0.00005 us-gaap_CommonStockParOrStatedValuePerShare |  |  |  |  |  |  |  |  |
Deferred stock issuance costs | $ 522 us-gaap_DeferredOfferingCosts | 3,241 us-gaap_DeferredOfferingCosts |  | 6,404 us-gaap_DeferredOfferingCosts |  |  |  |  |  |

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- Definition An element designated to encapsulate any additional information related to cash and cash equivalents not otherwise addressed by the existing taxonomy. Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition A general description of the lessee's leasing arrangements including, but not limited to, the following: a) the basis on which contingent rental payments are determined; (b) the existence and terms of renewal or purchase options and escalation clauses; (c) restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6452660&loc=d3e36991-112694 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6394851&loc=SL2265659-115463 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 15 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=6451445&loc=d3e32400-112679 + Details
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- Definition The likelihood that the uncertain tax position will not be sustained as a result of the examination by the taxing authority. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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