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Convertible bonds (Narrative) (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 18, 2014 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 CNY (¥) | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) $ / shares
Convertible bonds [Line Items] |  |  |  |  |  |  |  |
Convertible bonds | [1] |  | ¥ 0 |  | ¥ 2,572,119 |  | $ 0 |
Net proceeds |  |  |  |  |  | ¥ 2,402,549 |  |
Interest expense |  |  | 81,085 | 11,679 | 97,125 | ¥ 56,607 |  |
Convertible Bond, non-current |  |  |  |  |  |  |  |
Debt Conversion, Original Debt, Amount |  |  |  | $ 1,000 |  |  |  |
Class A common shares [Member] |  |  |  |  |  |  |  |
Convertible bonds [Line Items] |  |  |  |  |  |  |  |
Common shares, par value (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.00001 | $ 0.00001
2.25% Convertible Senior Notes due 2019 [Member] |  |  |  |  |  |  |  |
Convertible bonds [Line Items] |  |  |  |  |  |  |  |
Convertible bonds |  |  | ¥ 2,800,000 |  | 2,600,000 |  | $ 399,000 | $ 397,000
Aggregate principle amount |  | $ 400,000 |  |  |  |  |  |
Interest rate (as a percent) |  |  | 2.25% |  |  |  | 2.25% |
Net proceeds |  | $ 390,800 |  |  |  |  |  |
Issuance date |  | Mar. 18, 2014 |  |  |  |  |  |
Interest expense | ¥ |  |  | ¥ 81,085 |  | ¥ 74,786 |  |  |
Maturity date |  |  | Apr. 01, 2019 | Apr. 01, 2019 |  |  |  |
Debt Issuance Costs, Net |  | $ 9,200 |  |  |  |  |  |
2.25% Convertible Senior Notes due 2019 [Member] | Contingent redemption option [Member] |  |  |  |  |  |  |  |
Convertible bonds [Line Items] |  |  |  |  |  |  |  |
Redemption period, start date |  |  | Apr. 01, 2019 | Apr. 01, 2019 |  |  |  |
Redemption percentage |  |  | 100.00% | 100.00% |  |  |  |
2.25% Convertible Senior Notes due 2019 [Member] | Non-contingent redemption option [Member] |  |  |  |  |  |  |  |
Convertible bonds [Line Items] |  |  |  |  |  |  |  |
Redemption period, start date |  |  | Apr. 01, 2017 | Apr. 01, 2017 |  |  |  |
Redemption percentage |  |  | 100.00% | 100.00% |  |  |  |
2.25% Convertible Senior Notes due 2019 [Member] | ADS [Member] |  |  |  |  |  |  |  |
Convertible bonds [Line Items] |  |  |  |  |  |  |  |
Initial conversion rate |  |  | 9.0334 | 9.0334 |  |  |  |
Initial conversion price | $ / shares |  |  |  |  |  |  | $ 110.70 |
[1] | Effectively January 2016, ASU 2015-3 issued by FASB requires entities to present the issuance costs of bonds in the balance sheet as a direct deduction from the related bonds rather than assets. Accordingly, the Company retrospectively reclassified RMB25.3 million of issuance cost of bonds from other non-current assets into convertible bonds as of December 31, 2015.

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- Definition Carrying amount of long-term convertible debt as of the balance sheet date, net of the amount due in the next twelve months or greater than the normal operating cycle, if longer. The debt is convertible into another form of financial instrument, typically the entity's common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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