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Convertible bonds (Details) $ / shares in Units, ¥ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 18, 2014 USD ($) | Dec. 31, 2015 USD ($) $ / shares | Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 CNY (¥) | Dec. 31, 2013 CNY (¥) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 USD ($) $ / shares | Dec. 31, 2014 CNY (¥)
Convertible bonds [Line Items] |  |  |  |  |  |  |  |
Convertible bonds |  | $ 400,970,000 |  |  |  | ¥ 2,597,403 |  | ¥ 2,447,980
Net proceeds |  |  |  | ¥ 2,402,549 |  |  |  |
Interest expense |  | $ 14,994,000 | ¥ 97,125 | 56,607 |  |  |  |
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 |  | $ 400,000,000 |  |  |  | ¥ 2,597,403 | $ 400,000,000 | ¥ 2,447,980
Aggregate principle amount | $ 400,000,000 |  |  |  |  |  |  |
Interest rate (as a percent) |  | 2.25% |  |  |  | 2.25% |  |
Maturity date |  | Apr. 01, 2019 | Apr. 01, 2019 |  |  |  |  |
Net proceeds | 390,800,000 |  |  |  |  |  |  |
Debt issuance costs | $ 9,200,000 |  |  |  |  |  |  |
Issuance date | Mar. 18, 2014 |  |  |  |  |  |  |
Interest expense | ¥ |  |  | ¥ 74,786 | ¥ 56,607 |  |  |  |
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 |  |  |  |  |  |

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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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