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Components Of Equity - Additional Information (Detail) - $ / shares shares in Thousands |  |  |  | 9 Months Ended
--- | --- | --- | --- | ---
Nov. 05, 2018 | May 08, 2018 | May 02, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Class of Stock [Line Items] |  |  |  |  |
Date of declaration of dividends |  | May 08, 2018 | May 02, 2017 |  |
Dividend declared per share |  | $ 0.45 | $ 0.42 |  |
Date of dividend payment |  | Jun. 15, 2018 | Jun. 15, 2017 |  |
Dividends payable to shareholders date of record |  | Jun. 01, 2018 | Jun. 01, 2017 |  |
Non-Discretionary Plan |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares repurchased |  |  |  | 2,386 | 2,902
Average price per share |  |  |  | $ 72.72 | $ 55.58
Discretionary Plan |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares repurchased |  |  |  | 5,378 | 3,189
Average price per share |  |  |  | $ 71.07 | $ 56.26
Expected common stock shares issued and outstanding |  |  |  | 170,000 |
Subsequent Event |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Date of declaration of dividends | Nov. 05, 2018 |  |  |  |
Dividend declared per share | $ 0.45 |  |  |  |
Date of dividend payment | Dec. 17, 2018 |  |  |  |
Dividends payable to shareholders date of record | Dec. 03, 2018 |  |  |  |
Subsequent Event | Discretionary Plan |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Expected common stock shares issued and outstanding | 160,000 |  |  |  |

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