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Share-Based Compensation - Additional Information (Detail) (USD $) | 3 Months Ended |  |  | 3 Months Ended
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Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2014 Long Term Incentive Stock Option [Member] | Mar. 31, 2014 Long Term Incentive Stock Option [Member] Maximum [Member] | Mar. 31, 2014 Long Term Incentive Stock Option [Member] Minimum [Member] | Mar. 31, 2014 Long Term Incentive Plan Stock Option [Member] | Mar. 31, 2013 Long Term Incentive Plan Stock Option [Member] | Mar. 31, 2014 Long Term Incentive Plan Stock Option [Member] Maximum [Member] | Mar. 31, 2013 Long Term Incentive Plan Stock Option [Member] Maximum [Member] | Mar. 31, 2014 Long Term Incentive Plan [Member] | Mar. 31, 2014 Performance-Based RSUs [Member] | Mar. 31, 2013 Performance-Based RSUs [Member] | Mar. 31, 2014 Deferred Compensation Plan [Member] Deferrals | Mar. 31, 2014 Stock Options [Member] | Mar. 31, 2013 Stock Options [Member] | Mar. 31, 2014 Restricted Stock Units (RSUs) [Member] | Mar. 31, 2013 Restricted Stock Units (RSUs) [Member] | Mar. 31, 2014 Restricted Stock Units (RSUs) [Member] Chief Executive Officer [Member] | Mar. 31, 2014 Time-Based RSUs [Member] | Mar. 31, 2013 Time-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercised, Number of Shares | 0 |  |  |  |  | 1,250 | 0 |  |  |  |  |  |  | 0 | 0 |  |  |  |  |
Compensation expenses |  |  |  |  |  | $ 100,000 |  |  | $ 100,000 |  |  |  |  | $ 0 | $ 0 |  |  |  | $ 100,000 | $ 100,000
Common shares reserved for awards |  |  | 100,000 |  |  |  |  |  |  | 900,000 |  |  |  |  |  | 800,000 |  |  |  |
LTIP expiry date |  |  |  |  |  |  |  |  |  | Apr. 17, 2018 |  |  |  |  |  |  |  |  |  |
Share based compensation arrangement share based payment award vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |
Compensation cost expected to be recognized over period |  |  |  |  |  |  |  |  |  |  | 5,300,000 |  |  |  |  |  |  |  | 600,000 |
Weighted-average period |  |  |  |  |  | 2 years 4 months 24 days |  |  |  |  | 2 years 1 month 6 days |  |  |  |  |  |  |  | 2 years 1 month 6 days |
Performance-based compensation expense |  |  |  |  |  |  |  |  |  |  | 600,000 | 500,000 |  |  |  |  |  |  |  |
Excess tax benefits from restricted share awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 | 0 |  |  |
Shares remaining to be issued |  |  | 40,000 |  |  |  |  |  |  |  |  |  |  |  |  | 384,398 |  |  |  |
Number of deferrals |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Deferred shares and held by the rabbi trust | 249,198 | 253,156 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option issued under plan vest |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option issued under plan vest and granted after 2 years |  |  |  |  |  | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option issued under plan vest and granted after 3 years |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option issued under plan vest and expire |  |  |  | 10 years | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Forfeitures |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted, Number of Shares | 0 |  |  |  |  | 17,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average fair value of stock options granted |  |  |  |  |  | $ 25.79 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total intrinsic value of stock options |  |  |  |  |  |  | 0 | 100,000 | 0 |  |  |  |  |  |  |  |  |  |  |
Cash received for the exercise of stock options awards |  |  |  |  |  | 100,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Expected compensation cost related to unvested awards not yet recognized |  |  |  |  |  | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References No definition available. + Details
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- Definition The aggregate cash inflow comprised of the amount received from (a) employees to acquire the entity's shares under incentive awards, including stock option exercises and restricted stock arrangements, and (b) the excess tax benefit arising from such transactions. + References No definition available. + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition Date the equity-based award expires, in CCYY-MM-DD format. + 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 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 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 Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 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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