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Common Stock - Additional Information (Detail) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Nov. 30, 2017 | Feb. 29, 2016 | Jul. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock repurchase programs authorized to purchase, value | $ 1,200,000,000 | $ 800,000,000 |  | $ 400,000,000 | $ 400,000,000 | $ 400,000,000
Stock repurchased, value | 356,413,000 | 346,890,000 | $ 224,260,000 |  |  |
Compensation cost recognized | $ 56,738,000 | 48,109,000 | 39,971,000 |  |  |
Forfeitures utilization term | 5 years |  |  |  |  |
Total in-the-money value of all stock options exercised during the year | $ 85,500,000 | 149,400,000 | 154,100,000 |  |  |
Number of shares granted | 3,061,725 |  |  |  |  |
Stock issued during period, net of cancellations | 1,500,000 |  |  |  |  |
Class B |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock repurchased, value | $ 33,000 | 30,000 | 18,000 |  |  |
Shares reserved | 2,800,000 |  |  |  |  |
Issuance upon conversion of shares | 26,069,031 |  |  |  |  |
ASU 2016-09 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
New accounting adoption impact on income taxes and net income | $ 22,100,000 |  |  |  |  |
Excess tax benefit from stock-based compensation |  | 45,200,000 | 47,400,000 |  |  |
Stock Options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Compensation cost recognized, pre-tax charge | 54,300,000 | 45,800,000 | 38,000,000 |  |  |
Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Compensation cost recognized, after-tax | 2,500,000 | $ 2,300,000 | $ 2,000,000 |  |  |
Unrecognized compensation cost | $ 98,200,000 |  |  |  |  |
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 | $ 98,200,000 |  |  |  |  |
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 | 305,278 | 468,228 | 493,296 |  |  |
Stock repurchased, value | $ 34,200,000 | $ 57,000,000 | $ 58,000,000 |  |  |
Forfeited Restricted Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock repurchased, shares |  | 2,500 |  |  |  |
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 | $ 322,231,000 |  |  |  |  |
Stock Repurchase Programs Twenty Seventeen | Stock Repurchase Program |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock repurchased, shares | 6,799,642 |  |  |  |  |
Stock repurchased, value | $ 778,390,000 |  |  |  |  |
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 Repurchase Programs Twenty Fifteen |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock repurchased, shares |  |  | 1,326,207 |  |  |
Stock repurchased, value |  |  | $ 166,222,000 |  |  |
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 | 2,900,000 | 2,700,000 | 2,700,000 |  |  |
Weighted-average grant date fair value of option granted, per share | $ 27.05 | $ 23.80 | $ 21.37 |  |  |
Common Stock remain available for issuance | 7,800,000 |  |  |  |  |
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 |  |  |  |  |
2005 Employees' Restricted Stock Purchase Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common Stock remain available for issuance | 1,300,000 |  |  |  |  |
Number of shares granted | 86,693 | 75,792 | 68,213 |  |  |
2005 Employees' Restricted Stock Purchase Plan | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock issued under employee stock purchase plan | 23,557 | 14,146 | 17,789 |  |  |
2005 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 |  |  |
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 | $ 38,200,000 | $ 38,900,000 | $ 39,500,000 |  |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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