Forfeitures utilization term.

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In the money value of stock options.

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Increase in common stock dividends per share cash paid.

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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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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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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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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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, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP).

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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 ($)	1 Months Ended	3 Months Ended	12 Months Ended
	Jul. 31, 2019	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase programs authorized to purchase, value	$ 1,000,000,000.0		$ 2,700,000,000			$ 1,700,000,000
Stock repurchased, value			753,927,000	$ 414,002,000	$ 356,413,000
Compensation cost recognized			$ 69,431,000	66,581,000	56,738,000
Common Stock remain available for issuance			837,000
Forfeitures utilization term			5 years
Total in-the-money value of all stock options exercised during the year			$ 126,700,000	39,900,000	85,500,000
Number of shares granted			2,460,015
Weighted-average grant-date fair value of the restricted shares granted			$ 30.40
Stock issued during period, net of cancellations			1,800,000
ASU 2016-09
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
New accounting adoption impact on income taxes and net income			$ 12,200,000	1,200,000	22,100,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation cost recognized, pre-tax charge			60,100,000	61,100,000	54,300,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation cost recognized, after-tax			9,300,000	$ 5,500,000	$ 2,500,000
Unrecognized compensation cost			$ 122,800,000
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			$ 122,800,000
Unrecognized compensation cost vesting period			2 years 7 months 6 days
Income Tax Withholding Obligations
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchased, shares			336,943	102,800	305,278
Stock repurchased, value			$ 47,700,000	$ 12,700,000	$ 34,200,000
Stock Repurchase Programs Twenty Nineteen
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase programs authorized to purchase, value			$ 1,000,000,000
Stock repurchased, shares			5,397,753
Stock repurchased, value			$ 706,200,000
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 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 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			2,300,000	2,200,000	2,500,000
Weighted-average grant date fair value of option granted, per share			$ 30.40	$ 28.19	$ 27.05
Common Stock remain available for issuance			4,300,000
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 \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted			117,467	136,571	23,557
Weighted-average grant-date fair value of the restricted shares granted			$ 133.98	$ 119.51	$ 118.14
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			82,449	87,051	86,693
Class B
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase programs authorized to purchase, value			$ 756,100,000
Stock repurchased, value			$ 57,000	$ 34,000	$ 33,000
Shares reserved			2,600,000
Issuance upon conversion of shares			20,552,363
Class B \| Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved			35,600,000
Class B \| 2010 Employees' Restricted Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved			600,000
Special Dividend
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in dividends declared and paid, per share	$ 0.10
Dividends declared and paid, per share		$ 0.20	$ 0.60	$ 0.40	$ 0.40
Dividends declared and paid			$ 53,000,000.0	$ 37,300,000	$ 38,200,000