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Share-Based Compensation and Benefit Plans - Additional Information (Detail) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) Age $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Income tax expense | $ 67,077 | $ 72,813 | $ 90,221
Shares withheld as payment for tax withholdings related to share based compensation, market value | 1,528 | 3,782 | 4,674
Common stock contribution to 401(k) plan | $ 4,274 | $ 2,945 | $ 2,428
Employee Stock Purchase Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Aggregate shares of common stock that may be granted | shares | 1,500,000 |  |
Shares reserved for future grant | shares | 466,493 |  |
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 | 5,676 | 5,151 | 5,571
Average price of the shares purchased by employees | $ / shares | $ 145.09 | $ 168.21 | $ 144.58
Additional shares issued resulting from cash dividends reinvested in common stock | shares | 5,087 | 4,338 | 3,844
Net proceeds from shares purchased under ESPP | $ 1,638 | $ 1,585 | $ 1,389
2014 Plan |  |  |
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 that may be granted | shares | 2,000,000 |  |
Shares of common stock remaining under the 2001 Plan available for issuance under the 2014 Plan | shares | 45,421 |  |
Shares reserved for future grant | shares | 478,429 |  |
Contractual term of stock option awards | 5 years |  |
2014 Plan | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Years in which options plan vest | 2 years |  |
2014 Plan | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Years in which options plan vest | 4 years |  |
2014 Plan | Common Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares awarded under plan | shares | 779,502 |  |
2014 Plan | Class B Common Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares awarded under plan | shares | 787,490 |  |
401(k) Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock contribution to 401(k) Plan, shares | shares | 30,715 | 17,318 | 16,389
Common stock contribution to 401(k) plan | $ 4,274 | $ 2,945 | $ 2,428
2001 Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Aggregate shares of common stock that may be granted | shares | 0 |  |
Non-Vested Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted-average grant date fair value of non-vested (restricted) stock | $ / shares | $ 151.58 | $ 167.06 | $ 149.47
Fair value of non-vested stock that vested | $ 4,931 | $ 9,637 | $ 11,580
Unrecognized share-based compensation expense | $ 132,642 |  |
Vesting period related to unrecognized share-based compensation expense | 11 years |  |
Non-Vested Restricted Stock | Chief Executive Officer |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized share-based compensation expense | $ 57,000 |  |
Vesting period related to unrecognized share-based compensation expense | 9 years |  |
Vesting period related to shares obligated to issue in connection with incentive compensation agreement | shares | 56,823 |  |
Non-Vested Restricted Stock | Chief Executive Officer | Share-based Compensation Award, Tranche One |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized share-based compensation expense | $ 6,000 |  |
Vesting period related to unrecognized share-based compensation expense | 3 years |  |
Age of Chief Executive Officer when non-vested (restricted) stock vests | Age | 82 |  |
Non-Vested Restricted Stock | Chief Executive Officer | Share-based Compensation Award, Tranche Two |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized share-based compensation expense | $ 37,000 |  |
Vesting period related to unrecognized share-based compensation expense | 7 years |  |
Age of Chief Executive Officer when non-vested (restricted) stock vests | Age | 86 |  |
Non-Vested Restricted Stock | Chief Executive Officer | Share-based Compensation Award, Tranche Three |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized share-based compensation expense | $ 14,000 |  |
Vesting period related to unrecognized share-based compensation expense | 9 years |  |
Age of Chief Executive Officer when non-vested (restricted) stock vests | Age | 88 |  |
Non-Vested Restricted Stock | President |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized share-based compensation expense | $ 16,000 |  |
Vesting period related to unrecognized share-based compensation expense | 24 years |  |
Vesting period related to shares obligated to issue in connection with incentive compensation agreement | shares | 20,886 |  |
Non-Vested Restricted Stock | President | Share-based Compensation Award, Tranche One |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized share-based compensation expense | $ 15,000 |  |
Vesting period related to unrecognized share-based compensation expense | 24 years |  |
Age of president when non vested restricted shares vests | Age | 62 |  |
Non-Vested Restricted Stock | President | Share-based Compensation Award, Tranche Two |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized share-based compensation expense | $ 1,000 |  |
Vesting period related to unrecognized share-based compensation expense | 26 years |  |
Age of president when non vested restricted shares vests | Age | 64 |  |
Non-Vested Restricted Stock | Employee |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Age of employee when non-vested (restricted) stock vests | Age | 62 |  |
Non-Vested Restricted Stock | Common Stock |  |  |
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 |  |  | 32,454
Shares withheld as payment for tax withholdings related to share based compensation, market value |  |  | $ 4,664
Non-Vested Restricted Stock | Common and Class B Common Stock |  |  |
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 | 9,824 | 21,754 |
Shares withheld as payment for tax withholdings related to share based compensation, market value | $ 1,518 | $ 3,775 |
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Income tax expense | 626 | 635 | 645
Total intrinsic value of stock options exercised | 4,153 | 3,500 | 2,296
Cash received from Common stock issued | 11,703 | 5,006 | 3,855
Unrecognized share-based compensation expense | $ 3,942 |  |
Vesting period related to unrecognized share-based compensation expense | 1 year 8 months 12 days |  |
Fair value of stock options vested | $ 2,055 | $ 1,607 | $ 754
Stock Options | Common Stock |  |  |
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 | 799 | 7,027 | 350
Shares withheld as payment for tax withholdings related to share based compensation, market value | $ 134 | $ 1,269 | $ 53

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