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Common Stock - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Jul. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock repurchase programs authorized to purchase, value | $ 400,000,000 |  |  | $ 400,000,000
Stock repurchased, value | 224,260,000 | $ 100,749,000 | $ 27,201,000 |
Compensation cost recognized | 39,971,000 | 31,092,000 | 27,783,000 |
Excess tax benefit from share based compensation | $ 47,364,000 | $ 33,912,000 | $ 20,121,000 |
Stock options granted during period (net of cancellations) | 3,039,350 | 2,845,500 | 2,889,750 |
Total in-the-money value of all stock options exercised during the year | $ 154,100,000 | $ 112,500,000 | $ 70,900,000 |
Stock issued during period, net of cancellations | 1,300,000 |  |  |
Class B |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock repurchased, value | $ 18,000 | 10,000 | 4,000 |
Shares reserved | 2,800,000 |  |  |
Issuance upon conversion of shares | 24,056,061 |  |  |
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost recognized, pre-tax charge | $ 38,000,000 | 29,200,000 | 25,800,000 |
Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost recognized, after-tax | 2,000,000 | $ 1,900,000 | $ 2,000,000 |
Unrecognized compensation cost | $ 67,700,000 |  |  |
Unrecognized compensation cost vesting period | 2 years 8 months 12 days |  |  |
Unvested Stock option |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation cost | $ 67,700,000 |  |  |
Unrecognized compensation cost vesting period | 2 years 8 months 12 days |  |  |
Stock Repurchase Program |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock repurchased, shares | 1,874,399 |  |  |
Stock repurchased, value | $ 224,172,000 |  |  |
Income Tax Withholding Obligations |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock repurchased, shares | 493,296 | 480,972 | 427,170 |
Stock repurchased, value | $ 58,000,000 | $ 42,700,000 | $ 27,200,000 |
Stock Repurchase Programs Twenty Fifteen | Stock Repurchase Program |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock repurchased, shares | 1,326,207 |  |  |
Stock repurchased, value | $ 166,222,000 |  |  |
Stock Repurchase Programs Twenty Fourteen |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock repurchase programs authorized to purchase, value |  | $ 400,000,000 |  |
Stock repurchased, shares |  | 548,192 |  |
Stock repurchased, value |  | $ 57,950,000 |  |
Stock Repurchase Programs Twenty Thirteen |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock repurchased, shares |  |  | 0 |
Stock Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options granted during period (net of cancellations) | 2,900,000 | 2,800,000 | 2,600,000 |
Weighted-average grant date fair value of option granted | $ 21.37 | $ 17.23 | $ 13.33 |
Common Stock remain available for issuance |  | 6,900,000 |  |
Stock Incentive Plan | Class B |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares reserved | 29,500,000 |  |  |
2005 Employees' Restricted Stock Purchase Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost recognized | $ 68,213 | $ 75,303 | $ 90,587 |
Common Stock remain available for issuance | 1,500,000 |  |  |
Stock issued under employee stock purchase plan | 17,789 | 26,189 | 10,000 |
Special Dividend |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Dividends declared and paid, per share | $ 0.40 | $ 0.30 | $ 0.20 |
Dividends declared and paid | $ 39,500,000 | $ 29,700,000 | $ 19,600,000 |

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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=6415400&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=6415400&loc=d3e5070-113901 + Details
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