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EARNINGS PER SHARE (Details)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2014
CNY
Dec. 31, 2013
CNY
Dec. 31, 2012
CNY
Dec. 31, 2014
Class B Ordinary shares [Member]
USD ($)
Dec. 31, 2014
Class B Ordinary shares [Member]
CNY
Dec. 31, 2013
Class B Ordinary shares [Member]
CNY
Dec. 31, 2012
Class B Ordinary shares [Member]
CNY
Dec. 31, 2014
Class A Ordinary shares [Member]
USD ($)
Dec. 31, 2014
Class A Ordinary shares [Member]
CNY
Dec. 31, 2013
Class A Ordinary shares [Member]
CNY
Basic Numerator:                      
Allocation of net income attributable to ordinary shareholders used in calculating income per ordinary share-basic         $ 13,309us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 82,571us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 103,296us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 4,243us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 $ 12,004us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 74,478us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 2,758us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Basic Denominator:                      
Denominator used for earnings per share 339,782,819us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 339,782,819us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 238,342,685us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 229,374,777us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 178,645,232us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 178,645,232us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 232,144,532us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 229,374,777us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 161,137,587us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 161,137,587us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 6,198,153us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Earnings per share-basic $ 0.07us-gaap_EarningsPerShareBasic 0.46us-gaap_EarningsPerShareBasic 0.45us-gaap_EarningsPerShareBasic 0.02us-gaap_EarningsPerShareBasic $ 0.07us-gaap_EarningsPerShareBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 0.46us-gaap_EarningsPerShareBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 0.45us-gaap_EarningsPerShareBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 0.02us-gaap_EarningsPerShareBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 $ 0.07us-gaap_EarningsPerShareBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 0.46us-gaap_EarningsPerShareBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 0.45us-gaap_EarningsPerShareBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Diluted Numerator:                      
Allocation of net income attributable to ordinary shareholders used in calculating income per ordinary share- diluted         12,670us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 78,604us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 95,179us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 4,243us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 12,643us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 78,445us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 10,875us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Reallocation of net income attributable to ordinary shareholders as a result of conversion of Class B to Class A shares                     12,670us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 78,604us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 95,179us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Net income $ 25,313us-gaap_NetIncomeLoss 157,049us-gaap_NetIncomeLoss 106,054us-gaap_NetIncomeLoss 4,243us-gaap_NetIncomeLoss $ 12,670us-gaap_NetIncomeLoss
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 78,604us-gaap_NetIncomeLoss
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 95,179us-gaap_NetIncomeLoss
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 4,243us-gaap_NetIncomeLoss
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 $ 25,313us-gaap_NetIncomeLoss
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 157,049us-gaap_NetIncomeLoss
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 106,054us-gaap_NetIncomeLoss
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Diluted Denominator:                      
Weighted average number of ordinary shares outstanding used in calculating basic earnings per share 339,782,819us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 339,782,819us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 238,342,685us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 229,374,777us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 178,645,232us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 178,645,232us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 232,144,532us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 229,374,777us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 161,137,587us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 161,137,587us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 6,198,153us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Conversion of Class B to Class A ordinary shares                     178,645,232wbai_IncrementalCommonSharesAttributableToConversionOfCommonStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 178,645,232wbai_IncrementalCommonSharesAttributableToConversionOfCommonStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 232,144,532wbai_IncrementalCommonSharesAttributableToConversionOfCommonStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Share options                  4,303,704us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 18,065,885us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 18,065,885us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 21,386,682us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Denominator used for earnings per share 357,848,704us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 357,848,704us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 259,729,367us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 233,678,481us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 178,645,232us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 178,645,232us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 232,144,532us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 233,678,481us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 357,848,704us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 357,848,704us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 259,729,367us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Earnings per share-diluted $ 0.07us-gaap_EarningsPerShareDiluted 0.44us-gaap_EarningsPerShareDiluted 0.41us-gaap_EarningsPerShareDiluted 0.02us-gaap_EarningsPerShareDiluted $ 0.07us-gaap_EarningsPerShareDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 0.44us-gaap_EarningsPerShareDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 0.41us-gaap_EarningsPerShareDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 0.02us-gaap_EarningsPerShareDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 $ 0.07us-gaap_EarningsPerShareDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 0.44us-gaap_EarningsPerShareDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 0.41us-gaap_EarningsPerShareDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Earnings per ADS:                      
Denominator used for earnings per ADS - basic                     16,113,759wbai_WeightedAverageNumberOfAmericanDepositarySharesOutstandingBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 16,113,759wbai_WeightedAverageNumberOfAmericanDepositarySharesOutstandingBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 619,815wbai_WeightedAverageNumberOfAmericanDepositarySharesOutstandingBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Denominator used for earnings per ADS - diluted                     35,784,870wbai_WeightedAverageNumberOfDilutedAmericanDepositarySharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 35,784,870wbai_WeightedAverageNumberOfDilutedAmericanDepositarySharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 25,972,937wbai_WeightedAverageNumberOfDilutedAmericanDepositarySharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Earnings per ADS - basic $ 0.74wbai_EarningsPerAmericanDepositaryShareBasic 4.62wbai_EarningsPerAmericanDepositaryShareBasic 4.45wbai_EarningsPerAmericanDepositaryShareBasic                $ 0.74wbai_EarningsPerAmericanDepositaryShareBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 4.62wbai_EarningsPerAmericanDepositaryShareBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 4.45wbai_EarningsPerAmericanDepositaryShareBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Earnings per ADS - diluted $ 0.71wbai_EarningsPerAmericanDepositaryShareDiluted 4.39wbai_EarningsPerAmericanDepositaryShareDiluted 4.08wbai_EarningsPerAmericanDepositaryShareDiluted                $ 0.71wbai_EarningsPerAmericanDepositaryShareDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 4.39wbai_EarningsPerAmericanDepositaryShareDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 4.08wbai_EarningsPerAmericanDepositaryShareDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember