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Share-Based Compensation and Benefit Plans - Additional Information (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	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