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Parent company only condensed financial information (Details 3) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2014 CNY	Dec. 31, 2013 CNY	Dec. 31, 2012 CNY	Dec. 31, 2014 Parent company USD ($)	Dec. 31, 2014 Parent company CNY	Dec. 31, 2013 Parent company CNY	Dec. 31, 2012 Parent company CNY
Condensed Statements of Cash Flow
Net cash provided by/ (used in) operating activities	$ 163,591us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	1,015,016us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	3,569,819us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	1,403,652us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	$ 16,302us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	101,150us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(1,209)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	35,559us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash used in investing activities	(2,127,977)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	(13,203,248)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	(2,671,052)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	(3,369,454)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	(1,461,721)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(9,069,394)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(5,399,613)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(3,574,993)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash provided by financing activities	2,964,257us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	18,392,028us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	2,795,184us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	2,853,631us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	2,812,052us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	17,447,655us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	2,720,076us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	1,981,595us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Effect of exchange rate changes on cash and cash equivalents	(16,357)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations	(101,484)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations	(58,906)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations	688us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations	(58,519)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(363,084)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(51,988)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(6,445)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net increase in cash and cash equivalents	983,514us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	6,102,312us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	3,635,045us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	888,517us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	1,308,114us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	8,116,327us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(2,732,734)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(1,564,284)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents at beginning of year	1,742,633us-gaap_CashAndCashEquivalentsAtCarryingValue	10,812,339us-gaap_CashAndCashEquivalentsAtCarryingValue	7,177,294us-gaap_CashAndCashEquivalentsAtCarryingValue	6,288,777us-gaap_CashAndCashEquivalentsAtCarryingValue	2,011us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	12,475us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	2,745,209us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	4,309,493us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents at end of year	$ 2,726,147us-gaap_CashAndCashEquivalentsAtCarryingValue	16,914,651us-gaap_CashAndCashEquivalentsAtCarryingValue	10,812,339us-gaap_CashAndCashEquivalentsAtCarryingValue	7,177,294us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 1,310,125us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	8,128,802us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	12,475us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	2,745,209us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

X

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The effect of exchange rate changes on cash balances in continuing operations held in foreign currencies.

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Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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