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Treasury Stock - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |
Treasury stock, shares repurchased value | $ 110,977,000 |  |
Treasury stock, shares | 7,285,000 | 6,405,000 |
Treasury stock, cost | $ 586,161,000 | $ 475,184,000 |
Class A |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Treasury stock, shares repurchased | 0 |  |
Treasury stock, shares repurchased value | $ 0 |  |
Class A | 2005 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 |  |
Treasury stock, shares repurchased | 880,667 | 0 | 0
Shares repurchased, average price per share | $ 126.02 |  |
Treasury stock, shares repurchased value | $ 111,000,000 |  |
Treasury stock, shares | 4,707,614 |  |
Shares repurchased, average price per share | $ 96.92 |  |
Treasury stock, cost | $ 456,300,000 |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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 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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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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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