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Treasury Stock - Additional Information (Detail) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2020
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Treasury stock, shares repurchased value |  | $ 61,349,000 | $ 11,128,000 | $ 50,747,000 |
Treasury stock, shares | 8,684,000 |  |  |  | 8,684,000
Treasury stock, cost | $ 782,104,000 |  |  |  | $ 782,104,000
Class A |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Treasury stock, shares repurchased |  | 0 | 0 | 0 |
Treasury stock, shares repurchased value |  | $ 0 | $ 0 | $ 0 |
Class A | Share Repurchase Program |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Shares repurchased program expiration date | Apr. 29, 2023 |  |  |  |
Stock authorized to repurchase by board of directors | $ 800,000,000.0 |  |  |  |
Treasury stock, shares repurchased | 0 |  |  | 354,633 |
Shares repurchased, average price per share |  |  |  | $ 143.10 |
Treasury stock, shares repurchased value |  |  |  | $ 50,700,000 |
Treasury stock, shares | 5,674,226 |  |  |  |
Shares repurchased, average price per share | $ 104.13 |  |  |  |
Treasury stock, cost | $ 590,900,000 |  |  |  |
Stock remaining available for repurchase | $ 209,100,000 |  |  |  |

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Expiration date for the purchase of an entity's own shares under a stock repurchase plan, in the CCYY-MM-DD format. + References No definition available. + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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