Deferred compensation arrangement with individual compensation expense (income).

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Share based compensation number of deferrals.

+ References

No definition available.

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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.

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

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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 but not yet earned.

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- Definition

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

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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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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- Definition

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

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

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- Definition

Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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- Definition

Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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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).

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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No definition available.

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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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Percentage of vesting of share-based compensation awards.

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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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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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Share-Based Compensation - Additional Information (Detail)	1 Months Ended	12 Months Ended
	Nov. 30, 2015 USD ($)	Dec. 31, 2017 USD ($) Deferral $ / shares shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($) shares	May 10, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted under incentive plan \| shares		90,807
Forfeiture of restricted stock based unit \| shares		12,304
Deferred shares and held by the rabbi trust \| shares		289,026	297,281
Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved for awards \| shares		900,000
2016 Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved for awards \| shares					1,000,000
Incentive plan expiry date		May 10, 2026
Deferred Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of deferrals \| Deferral		2
Long Term Incentive Plan Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercised, Number of Shares \| shares		28,500	500	0
Total intrinsic value of stock options		$ 7,000,000	$ 0
Cash received for the exercise of stock options		1,500,000
Compensation expenses		$ 100,000	$ 200,000	$ 300,000
Granted, Number of Shares \| shares		5,000	0	10,500
Weighted-average period		1 year 10 months 24 days
Estimated Forfeitures		$ 0
Weighted average grant date fair value options granted \| $ / shares		$ 48.00
Expected compensation cost related to unvested awards not yet recognized		$ 100,000
Long Term Incentive Plan Stock Option [Member] \| After One Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option awards vesting percentage		50.00%
Long Term Incentive Plan Stock Option [Member] \| After Two Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option awards vesting percentage		75.00%
Long Term Incentive Plan Stock Option [Member] \| After Three Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option awards vesting percentage		100.00%
Long Term Incentive Plan Stock Option [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash received for the exercise of stock options			$ 100,000
Excess tax benefits		$ 100,000	$ 100,000	$ 100,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercised, Number of Shares \| shares		4,800	6,450	0
Total intrinsic value of stock options		$ 100,000	$ 100,000	$ 100,000
Cash received for the exercise of stock options		2,000,000	2,000,000
Compensation expenses		$ 0	0	0
Stock Options [Member] \| 2016 Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved for awards \| shares					100,000
Granted, Number of Shares \| shares		5,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved for awards \| shares		800,000
Restricted Stock Units (RSUs) [Member] \| Chief Executive Officer And Other Officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expenses	$ 600,000
Restricted Stock Units (RSUs) [Member] \| 2016 Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved for awards \| shares					900,000
Restricted shares granted under incentive plan \| shares		90,807
Long Term Incentive Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved for awards \| shares		100,000
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
Time-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expenses		$ 400,000	300,000	300,000
Compensation cost expected to be recognized over period		$ 400,000
Weighted-average period		1 year 9 months 18 days
Performance-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average period		1 year 9 months 18 days
Performance-based compensation expense (income)		$ 2,700,000	$ 900,000	$ 1,000,000
Performance-Based RSUs [Member] \| Grant 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Forfeiture of restricted stock based unit \| shares			40,676
Remaining performance-based compensation expense		3,700,000
Performance-Based RSUs [Member] \| Grant 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Forfeiture of restricted stock based unit \| shares				47,832
Service and Performance-based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Excess tax benefits from restricted share awards		$ 200,000
Service and Performance-based RSUs [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Excess tax benefits from restricted share awards			$ 100,000	$ 100,000