Share based compensation arrangement by share based payment award expiration year.

No definition available.

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- Definition

Share based compensation arrangement by share based payment award other than option compensation cost.

+ References

No definition available.

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- Definition

Share based compensation arrangement by shares based payment award number of shares authorized.

+ References

No definition available.

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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-Name Accounting Standards Codification
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- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Amount of cash inflow from exercise of option under share-based payment arrangement.

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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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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- 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).

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- Definition

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.

+ References

No definition available.

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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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.

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- Definition

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

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- Definition

Number of options outstanding, including both vested and non-vested options.

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Stock-Based Compensation Plans - Additional Information (Detail) - USD ($)		12 Months Ended
	May 31, 2008	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option plan, options outstanding		428,000	359,000
Stock options granted under Black-Scholes options pricing model		217,000
Cash received from stock option exercises		$ 231,000	$ 2,215,000	$ 1,701,000
Common stock, shares outstanding		135,600,501	140,102,480
Number of common shares, options exercisable		175,000
2008 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized issuance of shares of Company common stock	9,000,000
Expiry of equity incentive plan		2018
2008 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option plan, options outstanding		221,500,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expenses on stock option		$ 183,000	$ 352,000	$ 400,000
Stock options granted under Black-Scholes options pricing model		217,500	1,500	140,500
Vesting period		5 years
Intrinsic value of options exercised		$ 144,000	$ 1,300,000	$ 2,200,000
Unrecognized compensation cost related to nonvested options granted		$ 601,000
Weighted-average period for expected cost recognized		2 years 9 months 18 days
Fair value of options vested		$ 183,000	520,000	364,000
Cash received from stock option exercises		$ 232,000	2,200,000	1,700,000
Common stock, shares outstanding		428,320
Options exercisable lower price range		$ 11.03
Options exercisable upper price range		$ 24.83
Stock Options [Member] \| Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares, options exercisable		174,710
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to nonvested options granted		$ 7,300,000
2008 Equity Incentive Plan, granted restricted stock awards		358,000
Weighted average fair value of restricted stock		$ 18.20
Amount of compensation cost recognized		$ 5,300,000	$ 5,200,000	$ 3,100,000
Restricted Stock [Member] \| 2008 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
2008 Equity Incentive Plan, granted restricted stock awards		358,464	217,000	424,000
Weighted average fair value of restricted stock		$ 18.20	$ 20.76	$ 23.84
Restricted Stock [Member] \| 2008 Equity Incentive Plan [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		1 year
Restricted Stock [Member] \| 2008 Equity Incentive Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		5 years