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Share-Based Compensation and Benefit Plans - Additional Information (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) Age $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options of common stock outstanding	294,250	257,334
Total intrinsic value of stock options exercised | $	$ 4,490	$ 7,525	$ 3,746
Cash received from Common stock issued | $	4,447	4,850	3,324
Common stock contribution to 401(k) plan | $	$ 2,348	$ 1,963	$ 1,759
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	496,160
Number of days under which shares to be purchased by employee on such available	90 days
Discount allowed to employees to purchase share	5.00%
Shares purchased under ESPP	5,956	6,463	6,995
Average price of the shares purchased by employees | $ / shares	$ 125.84	$ 112.53	$ 90.89
Additional shares issued resulting from cash dividends reinvested in common stock	3,442	3,183	2,953
Net proceeds from shares purchased under ESPP | $	$ 1,206	$ 1,107	$ 921
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	1,424,848
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	293,950
2014 Plan | Common and Class B Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future grant	45,421
2014 Plan | Class B Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded under plan	326,623
401(k) Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock contribution to 401(k) Plan, shares	20,045	18,343	18,309
Common stock contribution to 401(k) plan | $	$ 2,348	$ 1,963	$ 1,759
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	37,750
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	$ 130.01	$ 114.55	$ 96.84
Fair value of non-vested stock that vested | $	$ 10,096	$ 2,468	$ 5,789
Shares withheld as payment for tax withholdings related to share based compensation, shares		7,206	21,028
Shares withheld as payment for tax withholdings related to share based compensation, market value | $		$ 889	$ 2,125
Unrecognized share-based compensation expense | $	$ 100,397
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	10 years
Shares of non-vested (restricted) stock obligated to issue in connection with incentive compensation agreements	67,853
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 | $	$ 13,000
Weighted-average period for recognition of share-based compensation expense, in years	6 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 | $	$ 46,000
Weighted-average period for recognition of share-based compensation expense, in years	10 years
Age of Chief Executive Officer when non-vested (restricted) stock vests | Age	86
Non-Vested Restricted Stock | Employee [Member]
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 | President [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average period for recognition of share-based compensation expense, in years	27 years
Shares of non-vested (restricted) stock obligated to issue in connection with incentive compensation agreements	25,774
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 | $	$ 2,096
Weighted-average period for recognition of share-based compensation expense, in years	1 year 9 months 18 days
Fair value of stock options vested | $	$ 736	$ 856	$ 1,145
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	348	26,006	5,454
Shares withheld as payment for tax withholdings related to share based compensation, market value | $	$ 51	$ 3,251	$ 490

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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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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The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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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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