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Share-Based Compensation Plans - Additional Information (Detail) - $ / shares |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 11, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Time Based Option Award |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock options awarded |  | 0 | 0 | 200,000 | 25,000
Strike price per share |  |  |  | $ 28.37 | $ 24.00
Percentage of shares vested on each anniversary of the grant date |  |  |  | 33.33% |
Unvested stock options forfeited |  | 0 | 0 |  |
Time-based options vesting date |  |  |  | 2017-02 | 2017-02
Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares issued |  | 0 |  |  |
Restricted Stock | Key Employee | Time Based Vesting |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares issued |  |  |  | 83,875 | 78,166
Restricted Stock | Key Employee | Stock vest first anniversary of the grant |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of shares vested on each anniversary of the grant date |  |  |  | 16.50% |
Vesting period |  |  |  | 1 year |
Restricted Stock | Key Employee | Stock vest second anniversary of the grant |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of shares vested on each anniversary of the grant date |  |  |  | 16.50% |
Vesting period |  |  |  | 2 years |
Restricted Stock | Key Employee | Stock vest third anniversary of the grant |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of shares vested on each anniversary of the grant date |  |  |  | 17.00% |
Vesting period |  |  |  | 3 years |
Restricted Stock | Key Employee | Vesting Schedule Two |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of shares vested on each anniversary of the grant date |  |  |  | 100.00% | 100.00%
Vesting period |  |  |  | 3 years | 3 years
Percentage of stock award subject to vesting |  |  |  | 50.00% | 50.00%
Restricted Stock | Chief Executive Officer |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of shares vested on each anniversary of the grant date |  |  |  | 33.33% | 33.33%
Number of shares issued |  |  |  | 10,574 | 11,587
Vesting period |  |  |  | 3 years | 3 years
Restricted Stock | Chief Executive Officer And Other Key Employee |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of shares vested on each anniversary of the grant date |  |  |  | 100.00% |
Number of shares issued |  |  |  | 44,058 |
Vesting date |  |  |  | Jan. 18, 2018 |
Ordinary Shares A | Share Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares authorized to be issued | 2,000,000 |  |  |  |
Ordinary Shares A | Key Employee |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares issued | 90,023 |  | 5,671 | 138,507 | 95,694
Weighted average grant date value of shares granted |  |  | $ 26.45 | $ 28.37 | $ 25.37
Ordinary Shares A | Key Employee | First Vesting |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of shares vested on each anniversary of the grant date |  |  |  |  | 33.33%
Number of shares issued |  |  |  |  | 5,671
Vesting period |  |  |  |  | 3 years
Ordinary Shares A | Non Employee Director |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted average grant date value of shares granted |  | $ 28.08 | $ 25.99 | $ 27.91 | $ 26.16
Number of shares earned not granted until 2nd quarter, 2014 |  | 8,798 | 9,250 | 18,045 | 18,178
Ordinary Shares A | Non Employee Director | Revised Compensation Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares issued | 27,766 |  |  |  |

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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 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 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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