ORGANIZATION (Carrying Amounts of Assets and Liabilities of VIEs) (Details) In Thousands, unless otherwise specified	Dec. 31, 2014 USD ($)	Dec. 31, 2014 CNY	Dec. 31, 2013 USD ($)	Dec. 31, 2013 CNY	Dec. 31, 2012 CNY	Dec. 31, 2011 CNY	Dec. 31, 2014 Variable Interest Entity, Primary Beneficiary [Member] USD ($)	Dec. 31, 2014 Variable Interest Entity, Primary Beneficiary [Member] CNY	Dec. 31, 2013 Variable Interest Entity, Primary Beneficiary [Member] CNY
Current assets:
Cash and cash equivalents	$ 78,257	485,556	$ 87,728	544,318	31,555	63,930	$ 53,298	330,690	27,831
Restricted cash	2,042	12,669		71,662			2,042	12,667	15,090
Short-term investments	11,311us-gaap_ShortTermInvestments	70,182us-gaap_ShortTermInvestments					11,311	70,182
Accounts receivable	11,998us-gaap_AccountsReceivableNetCurrent	74,445us-gaap_AccountsReceivableNetCurrent		62,522us-gaap_AccountsReceivableNetCurrent			7,825	48,550	50,778
Amounts due from intergroup companies							1,690	10,484	105,169
Prepayments and other current assets	25,447	157,887		94,273			24,055	149,256	92,395
Deferred tax assets, current portion	6,408us-gaap_DeferredTaxAssetsNetCurrent	39,761us-gaap_DeferredTaxAssetsNetCurrent		16,016us-gaap_DeferredTaxAssetsNetCurrent			6,297	39,068	15,287
Total current assets	202,494us-gaap_AssetsCurrent	1,256,403us-gaap_AssetsCurrent		909,876us-gaap_AssetsCurrent			106,518	660,897	306,550
Non-current assets:
Property and equipment, net	6,620us-gaap_PropertyPlantAndEquipmentNet	41,075us-gaap_PropertyPlantAndEquipmentNet		36,213us-gaap_PropertyPlantAndEquipmentNet			5,687	35,283	28,703
Intangible assets, net	541	3,354		3,377			247	1,535	1,130
Deposits	1,623us-gaap_DepositsAssetsNoncurrent	10,071us-gaap_DepositsAssetsNoncurrent		5,939us-gaap_DepositsAssetsNoncurrent			1,596	9,903	5,771
Long-term investments	1,072us-gaap_LongTermInvestments	6,652us-gaap_LongTermInvestments					824	5,114
Deferred tax assets, non-current	55us-gaap_DeferredTaxAssetsNetNoncurrent	343us-gaap_DeferredTaxAssetsNetNoncurrent		157us-gaap_DeferredTaxAssetsNetNoncurrent			55	343	157
Other non-current assets	289us-gaap_OtherAssetsNoncurrent	1,794us-gaap_OtherAssetsNoncurrent		2,738us-gaap_OtherAssetsNoncurrent			289	1,794	2,738
Total non-current assets	10,200us-gaap_AssetsNoncurrent	63,289us-gaap_AssetsNoncurrent		48,424us-gaap_AssetsNoncurrent			8,698	53,972	38,499
TOTAL ASSETS	212,694us-gaap_Assets	1,319,692us-gaap_Assets		958,300us-gaap_Assets			115,216	714,869	345,049
Current liabilities:
Short-term loans				12,802us-gaap_ShortTermBorrowings					12,802
Amounts due to intergroup companies							22,702	140,856	3,470
Accrued payroll and welfare payable	4,936	30,634		13,012			4,002	24,828	8,336
Accrued expenses and other current liabilities	19,016	117,992		88,246			16,176	100,367	72,857
Income taxes payable	1,491us-gaap_AccruedIncomeTaxesCurrent	9,250us-gaap_AccruedIncomeTaxesCurrent		4,507us-gaap_AccruedIncomeTaxesCurrent			754	4,680	1,863
Total current liabilities	25,443us-gaap_LiabilitiesCurrent	157,876us-gaap_LiabilitiesCurrent		118,567us-gaap_LiabilitiesCurrent			43,634	270,731	99,328
Non-current liabilities:
Long-term payables	7,123us-gaap_LongTermDebtNoncurrent	44,194us-gaap_LongTermDebtNoncurrent		30,313us-gaap_LongTermDebtNoncurrent			6,856	42,540	29,328
Total non-current liabilities	7,123us-gaap_LiabilitiesNoncurrent	44,194us-gaap_LiabilitiesNoncurrent		30,313us-gaap_LiabilitiesNoncurrent			6,856	42,540	29,328
TOTAL LIABILITIES	$ 32,566us-gaap_Liabilities	202,070us-gaap_Liabilities		148,880us-gaap_Liabilities			$ 50,490	313,271	128,656

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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