Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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Amount of cash inflow from issuance of shares under share-based compensation arrangement. Issuance includes, but is not limited to, exercise of stock options and similar instruments.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Discount rate from fair value on purchase date that participants pay for shares.

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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).

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Number of options outstanding, including both vested and non-vested options.

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Number of share instruments newly issued under a share-based compensation plan.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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Number of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan.

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Value of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan.

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Additional shares issued to employee stock purchase plan for dividend reinvestments.

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Cumulative number of shares awarded since inception of the plan.

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Number of shares remaining under the 2001 Plan available for issuance.

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Percent of market price that share based compensation awards are granted

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Share based compensation arrangement by share based payment award average price per share of shares purchased.

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Shares of non-vested (restricted) stock obligated to issue in connection with incentive compensation agreements.

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Vesting age of chief executive officer.

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Vesting age of employee.

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Share-Based Compensation and Benefit Plans - Additional Information (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) Age $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options of common stock outstanding	398,833	294,250
Shares withheld as payment for tax withholdings related to share based compensation, market value \| $	$ 4,674	$ 3,975	$ 1,465
Total intrinsic value of stock options exercised \| $	2,296	4,123	6,691
Cash received from Common stock issued \| $	3,855	4,447	4,850
Common stock contribution to 401(k) plan \| $	$ 2,428	$ 2,348	$ 1,963
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate shares of common stock that may be granted	1,500,000
Shares reserved for future grant	486,745
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	5,571	5,956	6,463
Average price of the shares purchased by employees \| $ / shares	$ 144.58	$ 125.84	$ 112.53
Additional shares issued resulting from cash dividends reinvested in common stock	3,844	3,442	3,183
Net proceeds from shares purchased under ESPP \| $	$ 1,389	$ 1,206	$ 1,107
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	2,000,000
Shares reserved for future grant	45,421
Shares reserved for future grant	1,112,365
Contractual term of stock option awards	5 years
2014 Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Years in which options plan vest	2 years
2014 Plan \| Maximum
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	439,534
2014 Plan \| Class B Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded under plan	493,522
401(k) Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock contribution to 401(k) Plan, shares	16,389	20,045	18,343
Common stock contribution to 401(k) plan \| $	$ 2,428	$ 2,348	$ 1,963
2001 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate shares of common stock that may be granted	0
Contractual term of stock option awards	5 years
Options of common stock outstanding	12,750
2001 Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Years in which options plan vest	2 years
2001 Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Years in which options plan vest	4 years
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	$ 149.47	$ 130.01	$ 114.55
Fair value of non-vested stock that vested \| $	$ 11,580	$ 10,096	$ 2,468
Unrecognized share-based compensation expense \| $	$ 109,297
Weighted-average period for recognition of share-based compensation expense, in years	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 \| $	$ 59,000
Weighted-average period for recognition of share-based compensation expense, in years	9 years
Shares of non-vested (restricted) stock obligated to issue in connection with incentive compensation agreements	42,871
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 \| $	$ 11,000
Weighted-average period for recognition of share-based compensation expense, in years	5 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 \| $	$ 48,000
Weighted-average period for recognition of share-based compensation expense, in years	9 years
Age of Chief Executive Officer when non-vested (restricted) stock vests \| Age	86
Non-Vested Restricted Stock \| President
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average period for recognition of share-based compensation expense, in years	26 years
Shares of non-vested (restricted) stock obligated to issue in connection with incentive compensation agreements	13,779
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	32,454		7,206
Shares withheld as payment for tax withholdings related to share based compensation, market value \| $	$ 4,664		$ 889
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		30,413
Shares withheld as payment for tax withholdings related to share based compensation, market value \| $		$ 3,967
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense \| $	$ 2,703
Weighted-average period for recognition of share-based compensation expense, in years	1 year 9 months 18 days
Fair value of stock options vested \| $	$ 754	$ 736	$ 856
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	350	348
Shares withheld as payment for tax withholdings related to share based compensation, market value \| $	$ 53	$ 51
Stock Options \| 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			26,006
Shares withheld as payment for tax withholdings related to share based compensation, market value \| $			$ 3,251