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Share-based compensation (Details 2) $ / shares in Units, ¥ in Thousands | 12 Months Ended |
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Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2016 CNY (¥) shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2015 CNY (¥) shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2014 CNY (¥) shares | Dec. 31, 2013 $ / shares shares | Dec. 31, 2016 CNY (¥) shares
Additional disclosures |  |  |  |  |  |  |  |
Share-based compensation charge | ¥ |  | ¥ 2,343,785 |  | ¥ 1,193,945 |  | ¥ 4,249,548 |  |
Share Incentive Plan |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Number of ordinary shares available for future grants | shares | 147,179,881 |  |  |  |  |  |  | 147,179,881
Share Incentive Plan | Employees |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Term of vesting schedule period | 6 years | 6 years |  |  |  |  |  |
Share Incentive Plan | Employees | RSUs | Vesting Based On Service |  |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |  |
Unvested at the beginning of the year (in shares) | shares | 38,934,336 | 38,934,336 | 31,703,526 | 31,703,526 | 27,150,848 | 27,150,848 |  |
Granted (in shares) | shares | 58,376,008 | 58,376,008 | 18,295,642 | 18,295,642 | 14,588,400 | 14,588,400 |  |
Vested (in shares) | shares | (8,547,278) | (8,547,278) | (7,130,556) | (7,130,556) | (6,385,905) | (6,385,905) |  |
Forfeited (in shares) | shares | (6,967,648) | (6,967,648) | (3,934,276) | (3,934,276) | (3,649,817) | (3,649,817) |  |
Unvested at the end of the year (in shares) | shares | 81,795,418 | 81,795,418 | 38,934,336 | 38,934,336 | 31,703,526 | 31,703,526 | 27,150,848 |
Weighted-Average Grant-Date Fair Value |  |  |  |  |  |  |  |
Unvested at the beginning of the year (in dollars per share) | $ / shares | $ 9.56 |  | $ 5.77 |  | $ 3.77 |  |  |
Granted (in dollars per share) | $ / shares | 12.85 |  | 14.37 |  | 8.43 |  |  |
Vested (in dollars per share) | $ / shares | 7.93 |  | 4.96 |  | 3.71 |  |  |
Forfeited (in dollars per share) | $ / shares | 10.66 |  | 9.73 |  | 5.07 |  |  |
Unvested at the end of the year (in dollars per share) | $ / shares | $ 11.98 |  | $ 9.56 |  | $ 5.77 |  | $ 3.77 |
Additional disclosures |  |  |  |  |  |  |  |
Share-based compensation charge | ¥ |  | ¥ 1,589,623 |  | ¥ 690,742 |  | ¥ 386,632 |  |
Unrecognized share-based compensation expense related to awards other than options | ¥ |  |  |  |  |  |  |  | ¥ 4,782,306
Weighted-average period over which share-based compensation expense is expected to be recognized | 6 years 2 months 12 days | 6 years 2 months 12 days |  |  |  |  |  |
Total fair value of RSUs vested | $ | $ 110,115,000 |  | $ 113,154,000 |  | $ 74,949,000 |  |  |
Total intrinsic value of RSUs vested | $ | $ 110,115,000 |  | $ 113,154,000 |  | $ 74,949,000 |  |  |
Share Incentive Plan | Employees | RSUs | Vesting Based On Performance |  |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |  |
Unvested at the beginning of the year (in shares) | shares | 876,364 | 876,364 | 1,466,658 | 1,466,658 |  |  |  |
Granted (in shares) | shares | 0 | 0 | 0 | 0 | 1,515,151 | 1,515,151 |  |
Vested (in shares) | shares | (118,540) | (118,540) | (188,936) | (188,936) |  |  |  |
Forfeited (in shares) | shares | (447,822) | (447,822) | (401,358) | (401,358) | (48,493) | (48,493) |  |
Unvested at the end of the year (in shares) | shares | 310,002 | 310,002 | 876,364 | 876,364 | 1,466,658 | 1,466,658 |  |
Weighted-Average Grant-Date Fair Value |  |  |  |  |  |  |  |
Unvested at the beginning of the year (in dollars per share) | $ / shares | $ 6.33 |  | $ 6.33 |  |  |  |  |
Granted (in dollars per share) | $ / shares |  |  |  |  | $ 6.33 |  |  |
Vested (in dollars per share) | $ / shares | 6.33 |  | 6.33 |  |  |  |  |
Forfeited (in dollars per share) | $ / shares | 6.33 |  | 6.33 |  | 6.33 |  |  |
Unvested at the end of the year (in dollars per share) | $ / shares | $ 6.33 |  | $ 6.33 |  | $ 6.33 |  |  |
Additional disclosures |  |  |  |  |  |  |  |
Share-based compensation charge | ¥ |  | ¥ 4,334 |  | ¥ 4,630 |  | ¥ 14,124 |  |
Unrecognized share-based compensation expense related to awards other than options | ¥ |  |  |  |  |  |  |  | ¥ 3,811
Weighted-average period over which share-based compensation expense is expected to be recognized | 2 years 1 month 6 days | 2 years 1 month 6 days |  |  |  |  |  |
Total fair value of RSUs vested | $ | $ 1,524,000 |  | $ 2,347,000 |  | $ 0 |  |  |
Total intrinsic value of RSUs vested | $ | $ 1,524,000 |  | $ 2,347,000 |  | $ 0 |  |  |
Share Incentive Plan | Employees | Share options | Vesting Based On Service |  |  |  |  |  |  |  |
Number of share options |  |  |  |  |  |  |  |
Outstanding at the beginning of the year (in shares) | shares | 27,434,622 | 27,434,622 | 26,201,252 | 26,201,252 | 26,912,328 | 26,912,328 |  |
Granted (in shares) | shares | 0 | 0 | 5,652,500 | 5,652,500 | 2,745,000 | 2,745,000 |  |
Exercised | shares | (2,820,648) | (2,820,648) | (2,694,404) | (2,694,404) | (849,844) | (849,844) |  |
Forfeited or cancelled (in shares) | shares | (2,954,958) | (2,954,958) | (1,724,726) | (1,724,726) | (2,606,232) | (2,606,232) |  |
Outstanding at the end of the year (in shares) | shares | 21,659,016 | 21,659,016 | 27,434,622 | 27,434,622 | 26,201,252 | 26,201,252 | 26,912,328 |
Vested and expected to vest at the end of the year (in shares) | shares | 19,493,114 |  |  |  |  |  |  | 19,493,114
Exercisable at the end of the year (in shares) | shares | 8,952,222 |  |  |  |  |  |  | 8,952,222
Weighted Average Exercise Price |  |  |  |  |  |  |  |
Outstanding at the beginning of the year (in dollars per share) | $ / shares | $ 6.10 |  | $ 4.37 |  | $ 3.96 |  |  |
Granted (in dollars per share) | $ / shares |  |  | 13.17 |  | 8.20 |  |  |
Exercised (in dollars per share) | $ / shares | 3.97 |  | 4.07 |  | 3.96 |  |  |
Forfeited or cancelled (in dollars per share) | $ / shares | 7.21 |  | 6.07 |  | 4.31 |  |  |
Outstanding at the end of the year (in dollars per share) | $ / shares | 6.23 |  | $ 6.10 |  | $ 4.37 |  | $ 3.96 |
Vested and expected to vest at the end of the year (in dollars per share) | $ / shares | 6.23 |  |  |  |  |  |  |
Exercisable at the end of the year (in dollars per share) | $ / shares | $ 5.02 |  |  |  |  |  |  |
Weighted Average Remaining Contractual Term (years) |  |  |  |  |  |  |  |
Outstanding at the end of the year | 7 years 3 months 18 days | 7 years 3 months 18 days | 8 years 1 month 6 days | 8 years 1 month 6 days | 8 years 6 months | 8 years 6 months | 9 years 4 months 24 days |
Vested and expected to vest at the end of the year | 7 years 3 months 18 days | 7 years 3 months 18 days |  |  |  |  |  |
Exercisable at the end of the year | 6 years 10 months 24 days | 6 years 10 months 24 days |  |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |
Outstanding at the end of the year (in dollars) | $ | $ 142,433,000 |  | $ 275,040,000 |  | $ 189,729,000 |  |  |
Vested and expected to vest at the end of the year (in dollars) | $ | 128,190,000 |  |  |  |  |  |  |
Exercisable at the end of the year (in dollars) | $ | $ 69,274,000 |  |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |  |
Share-based compensation charge | ¥ |  | ¥ 125,225 |  | ¥ 103,962 |  | ¥ 115,469 |  |
Weighted average grant date fair value of options granted | $ / shares |  |  | $ 5.59 |  | $ 4.48 |  |  |
Unrecognized share-based compensation expense related to options | ¥ |  |  |  |  |  |  |  | ¥ 161,679
Weighted-average period over which share-based compensation expense is expected to be recognized | 4 years 3 months 18 days | 4 years 3 months 18 days |  |  |  |  |  |
Total intrinsic value of options exercised | $ | $ 23,796,000 |  | $ 29,522,000 |  | $ 6,648,000 |  |  |
Cash received from the exercises of share options | $ | 12,454,000 |  | 12,332,000 |  | $ 0 |  |  |
Cash Receivable From Stock Option Exercises | $ | $ 747,000 |  | $ 1,992,000 |  |  |  |  |
Assumptions used to calculate estimated fair value of each option grant |  |  |  |  |  |  |  |
Exercise multiples |  |  |  |  | 2.8 | 2.8 |  |
Expected dividend yield (as a percent) |  |  | 0.00% | 0.00% | 0.00% | 0.00% |  |
Expected term (in years) |  |  | 10 years | 10 years | 10 years | 10 years |  |
Share Incentive Plan | Employees | Share options | Vesting Based On Service | Minimum |  |  |  |  |  |  |  |
Assumptions used to calculate estimated fair value of each option grant |  |  |  |  |  |  |  |
Expected volatility (as a percent) |  |  | 33.00% | 33.00% | 52.00% | 52.00% |  |
Risk-free interest rate (per annum) (as a percent) |  |  | 2.17% | 2.17% | 2.42% | 2.42% |  |
Exercise multiples |  |  | 2.0 | 2.0 |  |  |  |
Expected dividend yield (as a percent) |  |  | 0.00% | 0.00% | 0.00% | 0.00% |  |
Fair value of the underlying shares on the date of option grants (in dollars) | $ |  |  | $ 11.57 |  | $ 6.33 |  |  |
Share Incentive Plan | Employees | Share options | Vesting Based On Service | Maximum |  |  |  |  |  |  |  |
Assumptions used to calculate estimated fair value of each option grant |  |  |  |  |  |  |  |
Expected volatility (as a percent) |  |  | 50.00% | 50.00% | 53.00% | 53.00% |  |
Risk-free interest rate (per annum) (as a percent) |  |  | 2.65% | 2.65% | 3.50% | 3.50% |  |
Exercise multiples |  |  | 2.8 | 2.8 |  |  |  |
Fair value of the underlying shares on the date of option grants (in dollars) | $ |  |  | $ 14.69 |  | $ 12.51 |  |  |
Share Incentive Plan | Year three | Employees |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Year in which shares are vested | 3 years | 3 years |  |  |  |  |  |
Vesting percentage (as a percent) | 33.00% | 33.00% |  |  |  |  |  |
Share Incentive Plan | Year four | Employees |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Year in which shares are vested | 4 years | 4 years |  |  |  |  |  |
Vesting percentage (as a percent) | 25.00% | 25.00% |  |  |  |  |  |
Share Incentive Plan | Year five | Employees |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Year in which shares are vested | 5 years | 5 years |  |  |  |  |  |
Vesting percentage (as a percent) | 20.00% | 20.00% |  |  |  |  |  |
Share Incentive Plan | Year six | Employees |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Year in which shares are vested | 6 years | 6 years |  |  |  |  |  |
Vesting percentage (as a percent) | 17.00% | 17.00% |  |  |  |  |  |

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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