Forfeitures utilization term.

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In the money value of stock options.

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Share based compensation arrangement by share based payment award compensation cost before tax

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Share-based compensation arrangement by share-based payment award compensation cost net of tax.

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Share based compensation reserved for issuance upon conversion of shares.

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Aggregate number of common shares reserved for future issuance.

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Aggregate dividends paid during the period for each share of common stock outstanding.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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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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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Unrecognized cost of unvested options awarded to employees as compensation.

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Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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Represents the quantification of the effect of adopting the new accounting standard or change in accounting principle expected by the entity to have a significant effect on the entity's financial statements.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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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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The number of grants made 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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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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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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No definition available.

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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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Net number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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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Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Amount of stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Common Stock - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase programs authorized to purchase, value	$ 500,000,000	$ 1,700,000,000	$ 1,200,000,000	$ 1,200,000,000
Stock repurchased, value	414,002,000	356,413,000	346,890,000
Compensation cost recognized	$ 66,581,000	56,738,000	48,109,000
Common Stock remain available for issuance	1,000,000
Forfeitures utilization term	5 years
Total in-the-money value of all stock options exercised during the year	$ 39,900,000	85,500,000	149,400,000
Number of shares granted	2,567,653
Weighted-average grant-date fair value of the restricted shares granted	$ 28.19
Stock issued during period, net of cancellations	1,600,000
Class B
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchased, value	$ 34,000	33,000	30,000
Shares reserved	2,600,000
Issuance upon conversion of shares	24,230,875
ASU 2016-09
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
New accounting adoption impact on income taxes and net income	$ 1,200,000	22,100,000
Excess tax benefit from stock-based compensation			45,200,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost recognized, pre-tax charge	61,100,000	54,300,000	45,800,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost recognized, after-tax	5,500,000	$ 2,500,000	$ 2,300,000
Unrecognized compensation cost	$ 110,800,000
Unrecognized compensation cost vesting period	2 years 7 months 6 days
Unvested Stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 110,800,000
Unrecognized compensation cost vesting period	2 years 7 months 6 days
Stock Repurchase Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchased, shares	8,795,403
Stock repurchased, value	$ 1,013,484,000
Income Tax Withholding Obligations
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchased, shares	102,800	305,278	468,228
Stock repurchased, value	$ 12,700,000	$ 34,200,000	$ 57,000,000
Forfeited Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchased, shares	11,224	10,791	2,500
Stock Repurchase Programs Twenty Eighteen
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase programs authorized to purchase, value	$ 500,000,000
Stock repurchased, shares	3,321,968
Stock repurchased, value	$ 401,300,000
Stock Repurchase Programs Twenty Eighteen \| Stock Repurchase Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchased, shares	3,321,968
Stock repurchased, value	$ 401,316,000
Stock Repurchase Programs Twenty Seventeen
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase programs authorized to purchase, value		$ 400,000,000
Stock repurchased, shares		2,960,843
Stock repurchased, value		$ 322,200,000
Stock Repurchase Programs Twenty Seventeen \| Stock Repurchase Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchased, shares		2,960,843
Stock repurchased, value		$ 322,231,000
Stock Repurchase Programs Twenty Sixteen
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase programs authorized to purchase, value			$ 400,000,000
Stock Repurchase Programs Twenty Sixteen \| Stock Repurchase Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchased, shares			2,512,592
Stock repurchased, value			$ 289,937,000
Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value of option granted, number of shares	2,400,000	2,900,000	2,700,000
Weighted-average grant date fair value of option granted, per share	$ 28.19	$ 27.05	$ 23.80
Common Stock remain available for issuance	6,200,000
Stock Incentive Plan \| Class B
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved	35,600,000
Stock Incentive Plan \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options are exercisable, in period	4 years
2010 Employees' Restricted Stock Purchase Plan \| Class B
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved	600,000
2010 Employees' Restricted Stock Purchase Plan \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted	136,571	23,557	13,021
Weighted-average grant-date fair value of the restricted shares granted	$ 119.51	$ 118.14	$ 120.26
2010 Employees' Restricted Stock Purchase Plan \| Restricted Stock \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vesting period	5 years	5 years	5 years
2005 Employees' Restricted Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted	87,051	86,693	75,792
Special Dividend
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends declared and paid, per share	$ 0.40	$ 0.40	$ 0.40
Dividends declared and paid	$ 37,300,000	$ 38,200,000	$ 38,900,000