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Shareholders' Equity - Additional Information (Detail) - $ / shares shares in Thousands |  |  | 6 Months Ended
--- | --- | --- | ---
May 07, 2019 | May 08, 2018 | Jun. 30, 2019 | Jun. 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 |  |
Discretionary Plan |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares repurchased |  |  | 3,110 | 4,311
Average price per share |  |  | $ 73.45 | $ 70.49
Non-Discretionary Plan |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares repurchased |  |  | 88 | 1,411
Average price per share |  |  | $ 74.03 | $ 72.21

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