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Treasury Stock - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Equity, Class of Treasury Stock [Line Items] |  |
Treasury stock, shares | 6,405,000 | 6,405,000
Treasury stock, cost | $ 475,184,000 | $ 475,184,000
Class A | Two Thousand Five Share Repurchase Program |  |
Equity, Class of Treasury Stock [Line Items] |  |
Shares repurchased program expiration date | Apr. 29, 2018 |
Stock authorized to repurchase by board of directors | $ 800,000,000 |
Treasury stock, shares | 3,826,947 |
Shares repurchased, average price per share | $ 90.23 |
Treasury stock, cost | $ 345,300,000 |

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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