Parent company only condensed financial information (Details 2)	12 Months Ended
Dec. 31, 2014 USD ($)	Dec. 31, 2014 CNY	Dec. 31, 2013 CNY	Dec. 31, 2012 CNY	Dec. 31, 2014 Parent company USD ($)	Dec. 31, 2014 Parent company CNY	Dec. 31, 2013 Parent company CNY	Dec. 31, 2012 Parent company CNY
Operating expenses
Marketing	$ (646,340,000)us-gaap_MarketingExpense	(4,010,280,000)us-gaap_MarketingExpense	(1,590,171,000)us-gaap_MarketingExpense	(1,096,765,000)us-gaap_MarketingExpense	$ (147,545,000)	(915,455,000)
General and administrative	(847,768,000)us-gaap_GeneralAndAdministrativeExpense	(5,260,064,000)us-gaap_GeneralAndAdministrativeExpense	(760,338,000)us-gaap_GeneralAndAdministrativeExpense	(639,097,000)us-gaap_GeneralAndAdministrativeExpense	(618,041,000)	(3,834,699,000)	(4,065,000)	(18,581,000)
Loss from operations	(935,182,000)us-gaap_OperatingIncomeLoss	(5,802,437,000)us-gaap_OperatingIncomeLoss	(578,827,000)us-gaap_OperatingIncomeLoss	(1,951,098,000)us-gaap_OperatingIncomeLoss	(765,586,000)	(4,750,154,000)	(4,065,000)	(18,581,000)
Equity in loss of subsidiaries and VIEs					(72,497,000)	(449,816,000)	(164,843,000)	(1,750,074,000)
Interest income, net	102,769,000us-gaap_InvestmentIncomeInterest	637,641,000us-gaap_InvestmentIncomeInterest	343,770,000us-gaap_InvestmentIncomeInterest	175,751,000us-gaap_InvestmentIncomeInterest	29,542,000	183,294,000	3,987,000	37,190,000
Others, net	34,907,000us-gaap_OtherNonoperatingIncomeExpense	216,587,000us-gaap_OtherNonoperatingIncomeExpense	193,555,000us-gaap_OtherNonoperatingIncomeExpense	60,325,000us-gaap_OtherNonoperatingIncomeExpense	3,275,000	20,318,000	115,022,000	1,992,000
Net loss	(805,266,000)us-gaap_NetIncomeLoss	(4,996,358,000)us-gaap_NetIncomeLoss	(49,899,000)us-gaap_NetIncomeLoss	(1,729,473,000)us-gaap_NetIncomeLoss	(805,266,000)	(4,996,358,000)	(49,899,000)	(1,729,473,000)
Preferred shares redemption value accretion	(1,282,539,000)	(7,957,640,000)	(2,435,366,000)	(1,587,454,000)	(1,282,539,000)	(7,957,640,000)	(2,435,366,000)	(1,587,454,000)
Net loss attributable to holders of permanent equity securities	(2,087,805,000)	(12,953,998,000)	(2,485,265,000)	(3,316,927,000)	(2,087,805,000)	(12,953,998,000)	(2,485,265,000)	(3,316,927,000)
Net loss	(805,266,000)us-gaap_NetIncomeLoss	(4,996,358,000)us-gaap_NetIncomeLoss	(49,899,000)us-gaap_NetIncomeLoss	(1,729,473,000)us-gaap_NetIncomeLoss	(805,266,000)	(4,996,358,000)	(49,899,000)	(1,729,473,000)
Other comprehensive loss:
Foreign currency translation adjustments	(19,600,000)	(121,612,000)	(137,921,000)	(7,546,000)	(19,600,000)	(121,612,000)	(137,921,000)	(7,546,000)
Net change in unrealized gains on available-for-sale securities:
Unrealized gains, nil of tax	11,489,000	71,286,000	96,501,000		11,489,000	71,286,000	96,501,000
Reclassification adjustment for gains included in interest income, nil of tax	(9,216,000)	(57,181,000)	(73,277,000)		(9,216,000)	(57,181,000)	(73,277,000)
Net unrealized gains on available-for-sale securities	2,273,000	14,105,000	23,224,000		2,273,000	14,105,000	23,224,000
Total other comprehensive loss	(17,327,000)	(107,507,000)	(114,697,000)	(7,546,000)	(17,327,000)	(107,507,000)	(114,697,000)	(7,546,000)
Comprehensive loss	(822,593,000)us-gaap_ComprehensiveIncomeNetOfTax	(5,103,865,000)us-gaap_ComprehensiveIncomeNetOfTax	(164,596,000)us-gaap_ComprehensiveIncomeNetOfTax	(1,737,019,000)us-gaap_ComprehensiveIncomeNetOfTax	(822,593,000)	(5,103,865,000)	(164,596,000)	(1,737,019,000)
Unrealized gains, tax		0	0	0		0
Reclassification adjustment for gains included in "interest income", tax		0	0	0		0

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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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The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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Expenditures for planning and executing the conception, pricing, promotion, and distribution of ideas, goods, and services. Costs of public relations and corporate promotions are typically considered to be marketing costs.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The net result for the period of deducting operating expenses from operating revenues.

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Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities, attributable to parent entity. Excludes amounts related to other than temporary impairment (OTTI) loss.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to parent entity.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.

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Amount of decrease to net income for accretion of temporary equity to its redemption value to derive net income apportioned to common stockholders.

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