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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 |  |

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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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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