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Stock-Based Compensation Plans - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
May 31, 2008 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock option plan, options outstanding |  | 386,000 | 318,000 |
Stock options granted under Black-Scholes options pricing model |  | 107,000 |  |
Cash received from stock option exercises |  | $ 210,000 | $ 1,923,000 | $ 1,277,000
Common stock, shares outstanding |  | 139,344,981 | 139,818,703 |
Number of common shares, options exercisable |  | 201,000 |  |
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 |  |
Common stock available for future issuance |  | 6,019,107 |  |
2008 Stock Option Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock option plan, options outstanding |  | 1,546,125 |  |
Employee Stock Option |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total expenses on stock option |  | $ 384,000 | $ 273,000 | $ 220,000
Stock options granted under Black-Scholes options pricing model |  | 107,000 | 66,000 | 64,500
Vesting period |  | 5 years |  |
Intrinsic value of options exercised |  | $ 53,000 | $ 1,000,000 | $ 262,000
Unrecognized compensation cost related to nonvested options granted |  | 1,300,000 |  |
Weighted-average period for expected cost recognized |  |  | 3 years 9 months 18 days |
Fair value of options vested |  | 267,000 | $ 203,000 | 258,000
Cash received from stock option exercises |  | $ 210,000 | $ 1,900,000 | $ 1,300,000
Common stock, shares outstanding |  | 386,350 |  |
Employee Stock Option | Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options exercisable lower price range |  | $ 14.61 |  |
Employee Stock Option | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options exercisable lower price range |  | $ 24.83 |  |
Employee Stock Option | Common Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of common shares, options exercisable |  | 200,550 |  |
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation cost related to nonvested options granted |  | $ 16,700,000 |  |
2008 Equity Incentive Plan, granted restricted stock awards |  | 484,000 |  |
Weighted average fair value of restricted stock |  | $ 22.44 | $ 22.82 | $ 20.43
Amount of compensation cost recognized |  | $ 9,100,000 | $ 7,600,000 | $ 5,000,000
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 |  | 484,000 | 674,961 | 394,884
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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