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Shareholders' Equity - Additional Information (Detail) - $ / shares shares in Thousands |  |  | 1 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
May 04, 2021 | May 05, 2020 | Nov. 01, 2021 | Sep. 30, 2021 | Sep. 30, 2020
Class of Stock [Line Items] |  |  |  |  |
Date of declaration of dividends | May 04, 2021 | May 05, 2020 |  |  |
Dividend declared per share | $ 0.58 | $ 0.52 |  |  |
Date of dividend payment | Jun. 15, 2021 | Jun. 15, 2020 |  |  |
Dividends payable to shareholders date of record | Jun. 01, 2021 | Jun. 01, 2020 |  |  |
Subsequent Event |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Date of declaration of dividends |  |  | Nov. 01, 2021 |  |
Dividend declared per share |  |  | $ 0.58 |  |
Date of dividend payment |  |  | Dec. 15, 2021 |  |
Dividends payable to shareholders date of record |  |  | Dec. 01, 2021 |  |
Discretionary Plan |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Expected common stock shares outstanding |  |  |  | 160,000 |
Shares repurchased |  |  |  | 2,038 | 4,400
Average price per share |  |  |  | $ 110.45 | $ 71.41

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