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Share-Based Compensation - Additional Information (Detail) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 12 Months Ended
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Oct. 22, 2013 USD ($) | May 27, 2013 USD ($) | Sep. 30, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2013 CNY | Sep. 30, 2014 CNY | Dec. 31, 2012 | Sep. 30, 2014 Class A Ordinary Shares [Member] USD ($) | Dec. 31, 2013 Class A Ordinary Shares [Member] USD ($) | Sep. 30, 2014 Employee Stock Option [Member] May 4, 2011 [Member] Maximum [Member] | Dec. 31, 2013 Employee Stock Option [Member] May 4, 2011 [Member] Maximum [Member] | Sep. 30, 2014 Employee Stock Option [Member] November 4, 2013 [Member] Maximum [Member] | Dec. 31, 2013 Employee Stock Option [Member] November 4, 2013 [Member] Maximum [Member] | Sep. 30, 2014 Restricted Shares [Member] USD ($) | Sep. 30, 2014 Restricted Shares [Member] CNY | Dec. 31, 2013 Restricted Shares [Member] USD ($) | Dec. 31, 2013 Restricted Shares [Member] CNY | Dec. 31, 2013 Restricted Shares [Member] Scenario, Previously Reported [Member] USD ($) | Dec. 31, 2013 Restricted Shares [Member] Scenario, Previously Reported [Member] CNY | May 06, 2011 2011 Plan [Member] Employee Stock Option [Member] May 6, 2011 [Member] Directors and Employees [Member] USD ($) | Dec. 31, 2013 2011 Plan [Member] Employee Stock Option [Member] May 6, 2011 [Member] Directors and Employees [Member] | Aug. 01, 2011 2011 Plan [Member] Employee Stock Option [Member] August 1, 2011 [Member] Employees [Member] USD ($) | Dec. 31, 2013 2011 Plan [Member] Employee Stock Option [Member] August 1, 2011 [Member] Employees [Member] | Oct. 08, 2011 2011 Plan [Member] Employee Stock Option [Member] October 8, 2011 [Member] Employees [Member] USD ($) | Dec. 31, 2013 2011 Plan [Member] Employee Stock Option [Member] October 8, 2011 [Member] Employees [Member] | Dec. 19, 2011 2011 Plan [Member] Employee Stock Option [Member] December 19, 2011 [Member] Employees [Member] USD ($) | Dec. 31, 2013 2011 Plan [Member] Employee Stock Option [Member] December 19, 2011 [Member] Employees [Member] | Jul. 01, 2012 2011 Plan [Member] Employee Stock Option [Member] July 1, 2012 [Member] Employees [Member] USD ($) | Dec. 31, 2013 2011 Plan [Member] Employee Stock Option [Member] July 1, 2012 [Member] Employees [Member] | May 27, 2013 2011 Plan [Member] Employee Stock Option [Member] May 27, 2013 [Member] Employees [Member] USD ($) | Dec. 31, 2013 2011 Plan [Member] Employee Stock Option [Member] May 27, 2013 [Member] Employees [Member] | Oct. 22, 2013 2011 Plan [Member] Employee Stock Option [Member] October 22, 2013 [Member] Employees [Member] USD ($) | Dec. 31, 2013 2011 Plan [Member] Employee Stock Option [Member] October 22, 2013 [Member] Employees [Member] | Oct. 22, 2013 2011 Plan [Member] Employee Stock Option [Member] October 22, 2013 [Member] Employees [Member] Vesting Period From January 1, 2014 to January 1, 2017 [Member] | Oct. 22, 2013 2011 Plan [Member] Employee Stock Option [Member] October 22, 2013 [Member] Employees [Member] Vesting Period From July 1, 2014 to July 1, 2017 [Member] | Jan. 16, 2014 2011 Plan [Member] Employee Stock Option [Member] January 16,2014 [Member] Employees [Member] USD ($) | Sep. 30, 2014 2011 Plan [Member] Employee Stock Option [Member] January 16,2014 [Member] Employees [Member] | Jan. 16, 2014 2011 Plan [Member] Employee Stock Option [Member] January 16,2014 [Member] Employees [Member] Vesting Period From January 16, 2014 To January 16, 2017 [Member] | Jan. 16, 2014 2011 Plan [Member] Employee Stock Option [Member] January 16,2014 [Member] Employees [Member] Vesting Period From January 1, 2015 To January 1, 2018 [Member] | May 08, 2014 2013 Plan [Member] Restricted Shares [Member] Employees [Member] | Sep. 30, 2014 2013 Plan [Member] Restricted Shares [Member] Employees [Member] Tranches | Nov. 04, 2013 2013 Plan [Member] Restricted Shares [Member] November 4, 2013 [Member] Senior Executive [Member] | Dec. 31, 2013 2013 Plan [Member] Restricted Shares [Member] November 4, 2013 [Member] Senior Executive [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based awards grant to employees, directors and consultants to purchase aggregate ordinary shares |  |  |  |  |  |  |  |  |  | 7,843,100 | 7,843,100 | 3,350,000 | 3,350,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options, Granted | 228,000 | 560,000 | 177,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,950,000 |  | 700,000 |  | 110,000 |  | 2,000,000 |  | 120,000 |  | 560,000 |  | 228,000 |  | 78,000 | 150,000 | 177,600 |  | 57,600 | 120,000 |  |  | 400,000 |
Weighted average exercise price, Granted | $ 2.20 | $ 2.20 | $ 2.20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.20 |  | $ 2.20 |  | $ 2.20 |  | $ 2.20 |  | $ 2.20 |  | $ 2.20 |  | $ 2.20 |  |  |  | $ 2.20 |  |  |  |  |  |  |
Contractual term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  | 10 years |  | 10 years |  | 10 years |  | 10 years |  | 10 years |  | 10 years |  |  |  | 10 years |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 44-month period, with 25% of the awards vesting on January 1, 2012 and the remainder of the awards vesting on an annual basis each January 1, thereafter. |  | 41-month period, with 25% of the awards vesting on January 1, 2012 and the remainder of the awards vesting on an annual basis each January 1, thereafter. |  | 39-month period, with 25% of the awards vesting on January 1, 2012 and the remainder of the awards vesting on an annual basis each January 1, thereafter. |  | 49-month period, with 25% of the awards vesting on January 1, 2013 and the remainder of the awards vesting on an annual basis each January 1, thereafter. |  | 48-month period, with 25% of the awards vesting on July 1, 2013 and the remainder of the awards vesting on an annual basis each July 1, thereafter. |  | 44-month period, with 25% of the awards vesting on January 1, 2014 and the remainder of the awards vesting on an annual basis each January 1, thereafter. |  | January 1, 2014 to January 1, 2017, with 25% of the awards vesting on January 1, 2014 and the remainder of the awards vesting on an annual basis each January 1, thereafter; and 150,000 options will vest over a period from July 1, 2014 to July 1, 2017, with 25% of the awards vesting on July 1, 2014 and the remainder of the awards vesting on an annual basis each July 1, thereafter. |  |  |  | January 16, 2014 to January 16, 2017, with 25% of the awards vesting on January 16, 2014 and the remainder of the awards vesting on an annual basis each January 16, thereafter; and 120,000 options will vest over a period from January 1, 2015 to January 1, 2018, with 25% of the awards vesting on January 1, 2015 and the remainder of the awards vesting on an annual basis each January 1, thereafter. |  |  |  | All five tranches will vest over a period of four years, with 25% of the awards vesting on various dates ranging from March 14, 2015 to May 13, 2015, with the remainder of the awards vesting on an annual basis thereafter. |  | September 29, 2014 to September 29, 2017, with 25% of the awards vesting on September 29, 2014 and the remainder of the awards vesting on an annual basis each September 29, thereafter.
Vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 44 months |  | 41 months |  | 39 months |  | 49 months |  | 48 months |  | 44 months |  |  |  |  |  |  |  |  |  | 4 years |  |  |
Percentage of awards vesting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  | 25.00% |  | 25.00% |  | 25.00% |  | 25.00% |  | 25.00% |  |  |  | 25.00% | 25.00% |  |  | 25.00% | 25.00% |  | 25.00% | 25.00% |
Share-based awards, ordinary shares outstanding |  |  | 4,919,737 | 7,665,500 | 7,665,500 |  | 7,675,000 | 5,319,737 | 8,065,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares available for future grant |  |  |  |  |  |  |  | 2,885,000 | 3,127,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Closing stock price |  |  |  |  |  |  |  | $ 42.01 | $ 36.59 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate fair value of outstanding options at the grant date |  |  | $ 18,487 | $ 20,349 | 123,184 | 113,474 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expense |  |  | 9,168 | 8,628 | 52,234 | 56,272 |  |  |  |  |  |  |  | 6,189 | 37,986 |  |  | 4,795 | 29,024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unvested options/restricted shares expected to be recognized over a weighted-average period |  |  | 2 years 4 months 21 days | 1 year 4 months 21 days | 1 year 4 months 21 days |  |  |  |  |  |  |  |  | 3 years 2 months 16 days | 3 years 2 months 16 days |  |  | 3 years 9 months | 3 years 9 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate fair value of restricted shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,614 | 40,597 | $ 4,952 | 29,978 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average grant date fair value, Granted |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 29.00 |  | $ 12.38 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares, Granted |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 | 100,000 | 400,000 | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |
Number of tranches |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |

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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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=6415400&loc=d3e5070-113901 + Details
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- Definition Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date. + 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=6415400&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + 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=6415400&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=6415400&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=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 Period from grant date that an equity-based award expires, 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + 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 Gross number of share options (or share units) granted during the period. + References No definition available. + 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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