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Share-Based Compensation and Benefit Plans - Additional Information (Detail) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Oct. 15, 2022 USD ($) shares | Dec. 31, 2024 USD ($) Age $ / shares shares | Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options of common stock outstanding | shares |  | 300,495 | 410,865 |
Income tax benefit |  | $ 166,904 | $ 155,751 | $ 125,717
Payment, tax withholding, share-based payment arrangement |  | 39,673 | 2,828 | 87,107
Common stock contribution to 401(k) plan |  | 8,735 | 8,862 | 6,746
Current federal tax expense (benefit) |  | $ 115,991 | $ 119,133 | $ 71,475
Employee Stock Purchase Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Aggregate shares of common stock available for issuance | shares |  | 1,500,000 |  |
Shares reserved for future grant | shares |  | 431,061 |  |
Number of days of service required for an employee to purchase shares |  | 90 days |  |
Discount to employees to purchase shares |  | 5.00% |  |
Shares purchased under ESPP | shares |  | 2,935 | 4,096 | 4,101
Average price of the shares purchased by employees | $ / shares |  | $ 429.6 | $ 306.8 | $ 262.57
Additional shares issued resulting from cash dividends reinvested in common stock | shares |  | 2,308 | 3,079 | 3,365
Net proceeds from shares purchased under ESPP |  | $ 2,292 | $ 2,292 | $ 1,997
2014 Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options of common stock outstanding | shares |  | 65,850 |  |
2014 Plan [Member] | Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Years in which options plan vest |  | 2 years |  |
2014 Plan [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Years in which options plan vest |  | 4 years |  |
401(k) Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common stock contribution to 401(k) Plan, shares | shares |  | 20,387 | 35,533 | 21,560
Common stock contribution to 401(k) plan |  | $ 8,735 | $ 8,862 | $ 6,746
2021 Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percent of market price that share-based compensation awards are granted at |  | 100.00% |  |
Aggregate shares of common stock available for issuance | shares |  | 2,500,000 |  |
Shares awarded under the plan, net of cancellations | shares |  | 211,957 |  |
Shares reserved for future grant | shares |  | 2,295,370 |  |
Shares of common stock that remained available for issuance under the 2014 Plan | shares |  | 7,327 |  |
2021 Plan [Member] | Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Years in which options plan vest |  | 2 years |  |
2021 Plan [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Years in which options plan vest |  | 7 years |  |
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted-average grant date fair value of restricted stock | $ / shares |  | $ 428.46 | $ 302.71 | $ 290.55
Market value of vested shares |  | $ 102,328 | $ 5,745 | $ 271,781
Unrecognized share-based compensation expense |  | $ 222,387 |  |
Weighted average vesting period for unrecognized share-based compensation expense |  | 11 years 8 months 12 days |  |
Number of shares vested | shares |  | 199,329 |  |
Restricted Stock [Member] | Chief Executive Officer [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized share-based compensation expense |  | $ 45,000 |  |
Vesting period related to restricted stock obligated to issue in connection with incentive compensation agreement |  | 8 years |  |
Restricted stock obligated to issue in connection with incentive compensation agreement | shares |  | 21,597 |  |
Restricted Stock [Member] | Chief Executive Officer [Member] | Share-based Compensation Award, Tranche One [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized share-based compensation expense |  | $ 10,000 |  |
Weighted average vesting period for unrecognized share-based compensation expense |  | 2 years |  |
Age of Chief Executive Officer when restricted stock vests | Age |  | 86 |  |
Restricted Stock [Member] | Chief Executive Officer [Member] | Share-based Compensation Award, Tranche Two [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized share-based compensation expense |  | $ 17,000 |  |
Weighted average vesting period for unrecognized share-based compensation expense |  | 4 years |  |
Age of Chief Executive Officer when restricted stock vests | Age |  | 88 |  |
Restricted Stock [Member] | Chief Executive Officer [Member] | Share-based Compensation Award, Tranche Three [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized share-based compensation expense |  | $ 13,000 |  |
Weighted average vesting period for unrecognized share-based compensation expense |  | 5 years |  |
Age of Chief Executive Officer when restricted stock vests | Age |  | 89 |  |
Restricted Stock [Member] | Chief Executive Officer [Member] | Share-based Compensation Award, Tranche Four [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized share-based compensation expense |  | $ 5,000 |  |
Weighted average vesting period for unrecognized share-based compensation expense |  | 8 years |  |
Age of Chief Executive Officer when restricted stock vests | Age |  | 92 |  |
Restricted Stock [Member] | President [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized share-based compensation expense |  | $ 56,000 |  |
Vesting period related to restricted stock obligated to issue in connection with incentive compensation agreement |  | 19 years |  |
Restricted stock obligated to issue in connection with incentive compensation agreement | shares |  | 19,906 |  |
Restricted Stock [Member] | President [Member] | Share-based Compensation Award, Tranche One [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized share-based compensation expense |  | $ 55,000 |  |
Weighted average vesting period for unrecognized share-based compensation expense |  | 19 years |  |
Age of president when restricted shares vests | Age |  | 62 |  |
Restricted Stock [Member] | President [Member] | Share-based Compensation Award, Tranche Two [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized share-based compensation expense |  | $ 1,000 |  |
Weighted average vesting period for unrecognized share-based compensation expense |  | 21 years |  |
Age of president when restricted shares vests | Age |  | 64 |  |
Restricted Stock [Member] | Employee [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Age of employee when restricted stock vests | Age |  | 62 |  |
Restricted Stock [Member] | Various Key Leaders [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted stock obligated to issue in connection with incentive compensation agreement | shares |  | 4,747 |  |
Restricted Stock [Member] | Various Key Leaders [Member] | Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average vesting period for unrecognized share-based compensation expense |  | 5 years |  |
Restricted Stock [Member] | Various Key Leaders [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average vesting period for unrecognized share-based compensation expense |  | 11 years |  |
Restricted Stock [Member] | Common and Class B Common Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares withheld as payment for tax withholdings related to share based compensation, shares | shares |  | 78,378 | 7,585 |
Payment, tax withholding, share-based payment arrangement |  | $ 39,613 | $ 2,215 |
Restricted Stock [Member] | Class B Common Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares withheld as payment for tax withholdings related to share based compensation, shares | shares |  |  |  | 320,468
Payment, tax withholding, share-based payment arrangement |  |  |  | $ 87,049
Restricted Stock [Member] | Class B Common Stock [Member] | Chief Executive Officer [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Market value of vested shares | $ 265,106 |  |  |
Shares withheld as payment for tax withholdings related to share based compensation, shares | shares | 311,408 |  |  |
Payment, tax withholding, share-based payment arrangement | $ 104,319 |  |  |
Cash benefit related to vesting of restricted stock previously granted to our CEO |  |  |  | 67,000
Current federal tax expense (benefit) |  |  |  | 49,000
Number of shares vested | shares | 975,622 |  |  |
Shares retained net of tax withholdings | shares | 664,214 |  |  |
Cash payment related to tax withholding for share based compensation | $ 19,700 |  |  |
Employee Stock Option [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Income tax benefit |  | 7,040 | 6,617 | 2,658
Total intrinsic value of stock options exercised |  | 32,481 | 30,515 | 13,046
Cash received from the exercise of stock options |  | 28,791 | 26,835 | 18,425
Unrecognized share-based compensation expense |  | 7,188 |  |
Fair value of stock options vested |  | $ 4,022 | $ 2,751 | $ 2,721
Employee Stock Option [Member] | Common Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares withheld as payment for tax withholdings related to share based compensation, shares | shares |  | 3,999 | 17,687 | 1,592
Payment, tax withholding, share-based payment arrangement |  | $ 1,860 | $ 5,489 | $ 438

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