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Share-Based Compensation - Additional Information (Detail) (USD $)				9 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended			3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended								3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Equity Option [Member]	Sep. 30, 2014 Long Term Incentive Plan [Member]	Sep. 30, 2014 Long Term Incentive Stock Option [Member]	Sep. 30, 2014 Long Term Incentive Stock Option [Member] Maximum [Member]	Sep. 30, 2014 Long Term Incentive Stock Option [Member] Minimum [Member]	Sep. 30, 2014 Long Term Incentive Plan Stock Option [Member]	Sep. 30, 2014 Long Term Incentive Plan Stock Option [Member]	Sep. 30, 2013 Long Term Incentive Plan Stock Option [Member]	Sep. 30, 2013 Long Term Incentive Plan Stock Option [Member] Maximum [Member]	Sep. 30, 2014 Long Term Incentive Plan Stock Option [Member] Maximum [Member]	Sep. 30, 2013 Long Term Incentive Plan Stock Option [Member] Maximum [Member]	Sep. 30, 2014 Deferred Compensation Plan [Member] Deferrals_	Sep. 30, 2014 Performance-Based RSUs [Member]	Sep. 30, 2013 Performance-Based RSUs [Member]	Sep. 30, 2014 Performance-Based RSUs [Member]	Sep. 30, 2013 Performance-Based RSUs [Member]	Sep. 30, 2014 Performance-Based RSUs [Member] Maximum [Member]	Sep. 30, 2014 Performance-Based RSUs [Member] Maximum [Member]	Sep. 30, 2014 Performance-Based RSUs [Member] Performance Based RSU Grant 2012 [Member]	Sep. 30, 2014 Performance-Based RSUs [Member] Performance Based RSU Grant 2012 [Member]	Sep. 30, 2014 Performance-Based RSUs [Member] Performance Based RSU Grant 2013 [Member]	Sep. 30, 2014 Performance-Based RSUs [Member] Performance Based RSU Grant 2013 [Member]	Sep. 30, 2014 Restricted Stock Units (RSUs) [Member]	Sep. 30, 2013 Restricted Stock Units (RSUs) [Member]	Sep. 30, 2014 Restricted Stock Units (RSUs) [Member] Chief Executive Officer [Member]	Sep. 30, 2014 Stock Options [Member]	Sep. 30, 2013 Stock Options [Member]	Sep. 30, 2014 Stock Options [Member] Maximum [Member]	Sep. 30, 2013 Stock Options [Member] Maximum [Member]	Sep. 30, 2014 Time-Based RSUs [Member]	Sep. 30, 2014 Time-Based RSUs [Member]	Sep. 30, 2013 Time-Based RSUs [Member] Maximum [Member]	Sep. 30, 2013 Time-Based RSUs [Member] Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercised, Number of Shares									1,250	12,750																		1,000	12,400
Total intrinsic value of stock options												$ 100,000	$ 300,000																	$ 100,000	$ 300,000
Cash received for the exercise of stock options awards										600,000		100,000																		100,000	500,000
Excess tax benefits										100,000		0																0	100,000
Compensation expenses								100,000	200,000		100,000		100,000															0	0			100,000	200,000	100,000	200,000
Common shares reserved for awards			100,000	900,000	100,000																				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															2,700,000		2,700,000															400,000	400,000
Weighted-average period									2 years 3 months 18 days								1 year 10 months 24 days																1 year 8 months 12 days
Performance-based compensation expense															400,000	700,000	400,000	200,000
Reduction in performance-based compensation expense																			100,000	100,000	400,000	400,000	200,000	1,100,000
Excess tax benefits from restricted share awards																									200,000	0
Shares remaining to be issued					35,000																				384,398
Number of deferrals														2
Deferred shares and held by the rabbi trust	249,931	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									22,000	0
Weighted average fair value of stock options granted									$ 24.02
Expected compensation cost related to unvested awards not yet recognized								$ 400,000	$ 400,000

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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, which has been earned.

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

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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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