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Share-Based Compensation and Benefit Plans - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Age	Dec. 31, 2012	Dec. 31, 2011
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%
Fair value of non-vested stock that vested			$ 672
Total intrinsic value of stock options exercised	2,753	5,641	4,724
Cash received from Common stock issued	1,554	3,790	4,530
Tax benefits realized from stock option exercises	1,557	1,245	916
Age of Chief Executive Officer when non-vested (restricted) stock vests	82
Shares of non-vested (restricted) stock obligated to issue in connection with incentive compensation agreements	177,025
Common stock contribution to 401(k) plan	1,689	1,772	1,718
Class B Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares delivered as payment for tax withholdings related to stock option exercises, shares	13,227		7,616
Shares delivered as payment for tax withholdings related to stock option exercises, market value	1,227		437
Employee Stock
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	525,152
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	5,844	6,753	8,520
Average price of the shares purchased by employees	$ 79.46	$ 68.76	$ 59.44
Additional shares issued that resulted from cash dividends investment in common stock	1,899	15,411	5,097
Net proceeds from shares issued under ESPP	631	1,522	829
401(k) Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock issued to profit sharing retirement plan, shares	22,551	26,991	27,240
Common stock contribution to 401(k) plan	1,689	1,772	1,718
2001 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate shares of common stock that may be granted	4,000,000
Shares reserved for future grant	259,446
Contractual term of stock option awards	5 years
2001 Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Years in which options under 2001 Plan vest	2 years
2001 Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Years in which options under 2001 Plan vest	4 years
2001 Plan | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded under plan	1,987,912
2001 Plan | Class B Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded under plan	1,752,642
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	$ 80.21	$ 69.66	$ 63.87
Shares withheld as payment for tax withholdings related to share based compensation, shares			2,527
Shares withheld as payment for tax withholdings related to share based compensation, market value			180
Unrecognized share-based compensation expense	72,870
Weighted-average period for recognition of share-based compensation expense, in years	9 years 8 months 12 days
Non-Vested (Restricted) Stock | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense	53,000
Weighted-average period for recognition of share-based compensation expense, in years	9 years
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense	848
Weighted-average period for recognition of share-based compensation expense, in years	1 year 7 months 6 days
Fair value of stock options vested	822	315	475
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	4,749	29,987
Shares withheld as payment for tax withholdings related to share based compensation, market value	$ 450	$ 2,229

X

- Definition

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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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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

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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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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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Share Based Compensation Arrangement by Share Based Payment Awards Contractual Term

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Shares Delivered for Tax Withholding for Share Based Compensation

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

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Value Of Shares Delivered For Tax Withholding For Share Based Compensation

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Vesting age of chief executive officer.

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