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Share-Based Compensation - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercised	19,150
Deferred shares and held by the rabbi trust	253,156	184,036
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved for awards	300,000
Shares remaining to be issued	0
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%
Estimated Forfeitures	$ 0
Stock options exercised	19,150	17,757	22,025
Total intrinsic value of stock options	600,000	600,000	600,000
Cash received for exercise of stock options awards	800,000	400,000
Compensation expenses	0
Excess tax benefits	200,000	100,000	100,000
Stock Options [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option issued under plan vest and expire	10 years
Compensation expenses		100,000	100,000
Stock Options [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option issued under plan vest and expire	5 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved for awards	800,000
Shares remaining to be issued	429,873
Restricted Stock [Member] | Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation arrangement share based payment award vesting period	3 years
Time-Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expenses	300,000	300,000	300,000
Compensation cost expected to be recognized over period	400,000
Weighted-average period	1 year 8 months 12 days
Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved for awards	900,000
LTIP expiry date	Apr. 17, 2018
Long Term Incentive Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved for awards	100,000
Shares remaining to be issued	57,000
Long Term Incentive Stock Option [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option issued under plan vest and expire	10 years
Long Term Incentive Stock Option [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option issued under plan vest and expire	5 years
Performance-Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost expected to be recognized over period	3,300,000
Weighted-average period	1 year 8 months 12 days
Performance-based compensation expense	2,700,000	2,500,000	2,400,000
Excess tax benefits from restricted share awards	100,000	100,000	100,000
Deferred Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of deferrals	2
Long Term Incentive Plan Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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%
Estimated Forfeitures	0
Stock options exercised	14,250	1,250	3,000
Total intrinsic value of stock options	400,000
Cash received for exercise of stock options awards	600,000	100,000
Compensation expenses	100,000	300,000	100,000
Excess tax benefits		0
Weighted-average period	1 year 2 months 12 days
Granted, Number of Shares	0	8,000	14,500
Weighted average grant date fair value options granted		$ 21.76	$ 19.92
Expected compensation cost related to unvested awards not yet recognized	100,000
Long Term Incentive Plan Stock Option [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of stock options		100,000
Excess tax benefits	$ 100,000		$ 100,000

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Number of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees.

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Share based compensation arrangement by share based payment award options vested and expected to vest percentage after one year.

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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.

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Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise.

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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.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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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.

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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.

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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.

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Date the equity-based award expires, in CCYY-MM-DD format.

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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.

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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.

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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.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of share options (or share units) exercised during the current period.

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Value of forfeitures of stock or other type of equity issued of any equity-based compensation plan other than an employee stock ownership plan (ESOP).

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