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Share-Based Compensation - Additional Information (Detail) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands |  |  |  | 12 Months Ended |
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Apr. 24, 2014 shares | Jan. 02, 2014 shares | May 26, 2011 shares | Dec. 31, 2017 CNY (¥) Employee ¥ / shares shares | Dec. 31, 2017 USD ($) Employee $ / shares shares | Dec. 31, 2016 CNY (¥) shares | Dec. 31, 2016 $ / shares shares | Dec. 31, 2015 CNY (¥) | Dec. 31, 2017 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based compensation expenses |  |  |  | ¥ 73,316 | $ 11,268 | ¥ 306,149 |  | ¥ 315,740 |
2014 Restricted Share Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares subject to award | 122,545,665 |  |  |  |  |  |  |  |
Exercised |  |  |  | 42,548 | $ 6,539 |  |  |  |
Granted | $ / shares |  |  |  |  | $ 0.78 |  | $ 1.13 |  |
2014 Restricted Share Plan | Restricted shares with an option feature |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Granted | $ / shares |  |  |  |  | 0.78 |  |  |  |
Forfeited | $ / shares |  |  |  |  | $ 1.20 |  |  |  |
2013 Incentive Scheme |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares subject to award |  | 64,497,718 |  |  |  |  |  |  |
Award scheme term |  | 10 years |  |  |  |  |  |  |
2013 Incentive Scheme | Restricted shares with an option feature |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Exercised |  |  |  | 24,201 | $ 3,720 |  |  |  |
Granted | $ / shares |  |  |  |  | $ 0.60 |  |  |  |
Unrecognized compensation costs |  |  |  | ¥ 41,509 |  |  |  |  | $ 6,380
Forfeited | $ / shares |  |  |  |  | 1.27 |  |  |  |
2011 Share Award Scheme |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Award scheme term |  |  | 10 years |  |  |  |  |  |
Shares available to be granted in the future |  |  |  | 5,226,718 |  | 4,793,807 | 4,793,807 |  | 5,226,718
2011 Share Award Scheme | Restricted Stock [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Granted | $ / shares |  |  |  |  | $ 0.91 |  | $ 1.61 |  |
Unrecognized compensation costs |  |  |  | ¥ 4,979 |  |  |  |  | $ 765
Expected period over which unamortized compensation costs is to be recognized |  |  |  | 1 year 1 month 9 days | 1 year 1 month 9 days |  |  |  |
Forfeited | $ / shares |  |  |  |  | $ 1.23 |  |  |  |
Granted |  |  |  | 484,000 | 484,000 |  |  |  |
Total fair value of vested shares |  |  |  | ¥ 21,149 | $ 3,251 | ¥ 120,343 |  | 301,715 |
2011 Share Award Scheme | Restricted shares with repurchase options |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Repurchase price of vested shares | ¥ / shares |  |  |  | ¥ 4 |  |  |  |  |
Redemption right liability |  |  |  | ¥ 596 | 92 | 652 |  |  |
Change in fair value of redemption right recorded as share-based compensation costs |  |  |  | 27 | 4 |  |  |  |
Share-based compensation expenses |  |  |  | ¥ 33 | $ 5 |  |  |  |
2011 Share Award Scheme | Restricted shares with repurchase options | Employees |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Granted |  |  |  | 3,000,000 | 3,000,000 |  |  |  |
Number of employees | Employee |  |  |  | 2 | 2 |  |  |  |
Other Share Incentive Awards |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized compensation costs |  |  |  | ¥ 436 |  |  |  |  | $ 67
Expected period over which unamortized compensation costs is to be recognized |  |  |  | 3 months 15 days | 3 months 15 days |  |  |  |
Total fair value of vested shares |  |  |  | ¥ 7,888 | $ 1,212 | ¥ 12,831 |  | ¥ 12,247 |
Other Share Incentive Awards | Restricted Stock [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Granted | $ / shares |  |  |  |  |  |  | $ 1.62 |  |
Forfeited | $ / shares |  |  |  |  | $ 1.83 |  |  |  |
Common Class A [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Ordinary shares, shares issued |  |  |  | 415,250,897 |  | 410,608,263 | 410,608,263 |  | 415,250,897
Ordinary shares outstanding for exercised share awards |  |  |  | 409,345,857 |  | 380,922,773 | 380,922,773 |  | 409,345,857
Common Class A [Member] | 2014 Restricted Share Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Ordinary shares, shares issued |  |  |  | 11,542,980 |  | 3,265,470 | 3,265,470 |  | 11,542,980
Ordinary shares outstanding for exercised share awards |  |  |  | 11,542,980 |  | 3,265,470 | 3,265,470 |  | 11,542,980
Unrecognized compensation costs |  |  |  | ¥ 92,751 |  |  |  |  | $ 14,256
Expected period over which unamortized compensation costs is to be recognized |  |  |  | 2 years 3 months 26 days | 2 years 3 months 26 days |  |  |  |
Common Class A [Member] | 2013 Incentive Scheme |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Ordinary shares, shares issued |  |  |  | 15,114,190 |  | 9,983,080 | 9,983,080 |  | 15,114,190
Ordinary shares outstanding for exercised share awards |  |  |  | 15,114,190 |  | 9,983,080 | 9,983,080 |  | 15,114,190
Maximum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period |  | 5 years |  |  |  |  |  |  |
Maximum [Member] | 2014 Restricted Share Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period | 5 years |  |  |  |  |  |  |  |
Maximum [Member] | 2013 Incentive Scheme |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period |  |  |  | 1 year 9 months 18 days | 1 year 9 months 18 days |  |  |  |
Maximum [Member] | 2011 Share Award Scheme |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares subject to award |  |  | 100,000,000 |  |  |  |  |  |
Maximum [Member] | 2011 Share Award Scheme | Restricted shares with repurchase options |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Requisite service period |  |  |  | 4 years | 4 years | 4 years |  |  |

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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of grants made 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=96867065&loc=d3e5070-113901 + Details
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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=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + 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=96867065&loc=d3e5070-113901 + Details
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