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Additional information: condensed financial statements of the Company (Condensed balance sheets) (Parenthetical) (Details) ¥ in Millions | Dec. 31, 2016 CNY (¥) shares | Dec. 31, 2016 $ / shares | Dec. 31, 2015 $ / shares shares | Dec. 31, 2014 shares
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Accounting Standards Update 2015-03 [Member] |  |  |  |
Condensed balance sheets [Line Items] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | ¥ | ¥ 25.3 |  |  |
Class A common shares [Member] |  |  |  |
Condensed balance sheets [Line Items] |  |  |  |
Common shares, par value (in dollars per share) | $ / shares |  | $ 0.00001 | $ 0.00001 |
Common shares, shares authorized | 10,000,000,000 |  | 10,000,000,000 | 10,000,000,000
Common shares, shares issued | 750,115,028 |  | 728,227,848 | 706,173,568
Common shares, shares outstanding | 750,115,028 |  | 728,227,848 | 706,173,568
Class B common shares [Member] |  |  |  |
Condensed balance sheets [Line Items] |  |  |  |
Common shares, par value (in dollars per share) | $ / shares |  | 0.00001 | $ 0.00001 |
Common shares, shares authorized | 1,000,000,000 |  | 1,000,000,000 | 1,000,000,000
Common shares, shares issued | 359,557,976 |  | 369,557,976 | 427,352,696
Common shares, shares outstanding | 359,557,976 |  | 369,557,976 | 427,352,696
Parent [Member] | Class A common shares [Member] |  |  |  |
Condensed balance sheets [Line Items] |  |  |  |
Common shares, par value (in dollars per share) | $ / shares |  | 0.00001 | $ 0.00001 |
Common shares, shares authorized | 10,000,000,000 |  | 10,000,000,000 |
Common shares, shares issued | 750,115,028 |  | 728,227,848 |
Common shares, shares outstanding | 750,115,028 |  | 728,227,848 |
Parent [Member] | Class B common shares [Member] |  |  |  |
Condensed balance sheets [Line Items] |  |  |  |
Common shares, par value (in dollars per share) | $ / shares |  | $ 0.00001 | $ 0.00001 |
Common shares, shares authorized | 1,000,000,000 |  | 1,000,000,000 |
Common shares, shares issued | 359,557,976 |  | 369,557,976 |
Common shares, shares outstanding | 359,557,976 |  | 369,557,976 |

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