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Share-Based Compensation Plans - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended
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Sep. 30, 2014 Time Based Option Award | Sep. 30, 2013 Time Based Option Award | Sep. 30, 2014 Time Based Option Award | Sep. 30, 2013 Time Based Option Award | Sep. 30, 2014 Restricted Stock Key Employees Vesting Schedule One | Sep. 30, 2014 Restricted Stock Key Employees Vesting Schedule Two | Sep. 30, 2013 Restricted Stock key Employees And Former Employee Vesting Schedule One | Sep. 30, 2013 Restricted Stock key Employees And Former Employee Vesting Schedule Two | Jun. 11, 2014 Ordinary Shares A Share Incentive Plan | Sep. 30, 2013 Ordinary Shares A A Former Employee | Sep. 30, 2013 Ordinary Shares A A Former Employee | Sep. 30, 2014 Ordinary Shares A Key Employees | Sep. 30, 2014 Ordinary Shares A Key Employees First Vesting | Sep. 30, 2014 Ordinary Shares A Key Employees Second Vesting | Sep. 30, 2014 Ordinary Shares A Non Employee Director | Sep. 30, 2013 Ordinary Shares A Non Employee Director | Sep. 30, 2014 Ordinary Shares A Non Employee Director | Sep. 30, 2013 Ordinary Shares A Non Employee Director | Sep. 30, 2014 Ordinary Shares A Non Employee Director Revised Compensation Plan | Sep. 30, 2013 Ordinary Shares A key Employees And Former Employee | Sep. 30, 2013 Ordinary Shares A key Employees And Former Employee Time Based Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized to be issued |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Stock options awarded | 0 | 0 | 25,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unvested stock options forfeited | 75,000 | 0 | 75,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option awarded, strike price |  |  | $ 24.00 |  |  |  |  |  |  | $ 20.00 | $ 20.00 |  |  |  |  |  |  |  |  |  |
Time-based options vesting date |  |  | 2017-02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued |  |  |  |  |  |  |  |  |  | 7,717 | 14,292 | 95,694 | 5,671 | 90,023 | 9,498 | 9,718 | 27,676 | 31,583 | 18,838 | 95,879 | 81,587
Weighted average grant date value of shares granted |  |  |  |  |  |  |  |  |  |  |  | $ 25.37 |  |  | $ 25.23 | $ 23.55 | $ 25.84 | $ 22.90 |  | $ 21.81 |
Percentage of shares vested on each anniversary of the grant date |  |  |  |  |  | 100.00% |  | 100.00% |  |  |  |  | 33.33% |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 3 years | 3 years | 3 years | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares earned not granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,326 |  |  |  |  |
Weighted average grant date value of shares earned not granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25.46 |  |  |  |  |

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Earned Not Granted In Period + References No definition available. + Details
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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Earned Not Granted In Period Weighted Average Grant Date Fair Value + References No definition available. + Details
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- Definition Share Based Compensation Arrangement By Share Based Payment Award Options Award Vesting Date Month And Year + References No definition available. + 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 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 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=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 non-vested options forfeited. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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