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Share-Based Compensation - Summary of Company's Employee Share Option Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 9 Months Ended | 12 Months Ended
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Oct. 22, 2013 | May 27, 2013 | Jul. 01, 2012 | Dec. 19, 2011 | Oct. 08, 2011 | Aug. 01, 2011 | May 06, 2011 | Sep. 30, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of options, Outstanding, Beginning balance |  |  |  |  |  |  |  | 7,665,500 | 7,675,000 |
Number of options, Granted | 228,000 | 560,000 |  |  |  |  |  | 177,600 |  |
Number of options, Exercised |  |  |  |  |  |  |  | (2,888,363) |  |
Number of options, Forfeited |  |  |  |  |  |  |  | (35,000) | (797,500) |
Number of options, Outstanding, Ending balance |  |  |  |  |  |  |  | 4,919,737 | 7,665,500 | 7,675,000
Number of options, Vested and expected to vest, Ending balance |  |  |  |  |  |  |  | 4,806,777 | 7,620,600 |
Number of options, Exercisable, Ending balance |  |  |  |  |  |  |  | 2,200,537 | 3,330,000 |
Weighted average exercise price, Outstanding, Beginning balance |  |  |  |  |  |  |  | $ 2.20 | $ 2.20 |
Weighted average exercise price, Granted | $ 2.20 | $ 2.20 |  |  |  |  |  | $ 2.20 |  |
Weighted average exercise price, Exercised |  |  |  |  |  |  |  | $ 2.20 |  |
Weighted average exercise price, Forfeited |  |  |  |  |  |  |  | $ 2.20 | $ 2.20 |
Weighted average exercise price, Outstanding, Ending balance |  |  |  |  |  |  |  | $ 2.20 | $ 2.20 | $ 2.20
Weighted average exercise price, Vested or expected to vest |  |  |  |  |  |  |  | $ 2.20 | $ 2.20 |
Weighted average exercise price, Exercisable |  |  |  |  |  |  |  | $ 2.20 | $ 2.20 |
Weighted average grant date fair value, Outstanding, Beginning balance |  |  |  |  |  |  |  | $ 2.65 | $ 2.38 |
Weighted average grant date fair value, Granted |  | $ 3.03 | $ 2.36 | $ 2.41 | $ 2.37 | $ 2.18 | $ 2.40 | $ 34.57 |  |
Weighted average grant date fair value, Outstanding, Ending balance | $ 11.64 | $ 4.58 | $ 3.70 | $ 3.68 | $ 3.68 | $ 3.44 | $ 3.69 | $ 3.76 | $ 2.65 | $ 2.38
Weighted average grant date fair value, Vested or expected to vest |  |  |  |  |  |  |  | $ 3.72 | $ 2.64 |
Weighted average grant date fair value, Exercisable |  |  |  |  |  |  |  | $ 2.51 | $ 2.38 |
Weighted average remaining contractual term |  |  |  |  |  |  |  | 7 years 2 months 9 days | 7 years 8 months 27 days | 8 years 6 months 15 days
Weighted average remaining contractual term, Vested or expected to vest |  |  |  |  |  |  |  | 7 years 2 months 5 days | 7 years 8 months 23 days |
Weighted average remaining contractual term, Exercisable |  |  |  |  |  |  |  | 6 years 10 months 10 days | 7 years 5 months 19 days |
Aggregate intrinsic value of share options, Outstanding, Beginning balance |  |  |  |  |  |  |  | $ 263,617 | $ 11,513 |
Aggregate intrinsic value of share options, Outstanding, Ending balance |  |  |  |  |  |  |  | 195,855 | 263,617 | 11,513
Aggregate intrinsic value of share options, Vested or expected to vest |  |  |  |  |  |  |  | 191,358 | 262,072 |
Aggregate intrinsic value of share options, Exercisable |  |  |  |  |  |  |  | $ 87,603 | $ 114,519 |
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average grant date fair value, Granted | $ 9.63 |  |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average grant date fair value, Granted | $ 9.69 |  |  |  |  |  |  |  |  |

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Weighted Average Grant Date Fair Value + References No definition available. + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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 Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 -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 Gross number of share options (or share units) granted during the period. + References No definition available. + 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 Weighted average grant-date fair value of non-vested options outstanding. + References No definition available. + 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 Weighted average remaining contractual term for option awards outstanding, 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 (e)(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 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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- Definition As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for fully vested and expected to vest options outstanding, 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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