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Shareholders' Equity - Additional Information (Detail) - $ / shares shares in Thousands |  |  |  | 9 Months Ended
--- | --- | --- | --- | ---
Nov. 04, 2019 | May 07, 2019 | May 08, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Class of Stock [Line Items] |  |  |  |  |
Expected common stock shares issued and outstanding |  |  |  | 160,000 |
Date of declaration of dividends |  | May 07, 2019 | May 08, 2018 |  |
Dividend declared per share |  | $ 0.50 | $ 0.45 |  |
Date of dividend payment |  | Jun. 17, 2019 | Jun. 15, 2018 |  |
Dividends payable to shareholders date of record |  | Jun. 03, 2019 | Jun. 01, 2018 |  |
Subsequent Event |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Date of declaration of dividends | Nov. 04, 2019 |  |  |  |
Dividend declared per share | $ 0.50 |  |  |  |
Date of dividend payment | Dec. 16, 2019 |  |  |  |
Dividends payable to shareholders date of record | Dec. 02, 2019 |  |  |  |
Discretionary Plan |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares repurchased |  |  |  | 4,002 | 5,378
Average price per share |  |  |  | $ 72.57 | $ 71.07
Non-Discretionary Plan |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares repurchased |  |  |  | 88 | 2,386
Average price per share |  |  |  | $ 74.03 | $ 72.72

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