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Cash Dividends - Additional Information (Detail) - $ / shares | Jul. 10, 2019 | Jul. 10, 2018 | Jul. 11, 2017
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Class of Stock [Line Items] |  |  |
Dividend payable date, declared day |  | Jul. 10, 2018 | Jul. 11, 2017
Annual cash dividend |  | $ 2.55 | $ 2.50
Subsequent Event [Member] |  |  |
Class of Stock [Line Items] |  |  |
Dividend payable date, declared day | Jul. 10, 2019 |  |
Special cash dividend | $ 2.40 |  |
Annual cash dividend | $ 0.60 |  |

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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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