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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 |

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