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Shareholders' Equity - Additional Information (Detail) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Nov. 01, 2017 | Oct. 31, 2017 | Aug. 31, 2015 | Dec. 31, 2012
Equity [Abstract] |  |  |  |  |  |  |
Dividends declared per share (in dollars per share) | $ 2.96 | $ 2.84 | $ 2.66 |  |  |  |
Dividends payable | $ 80,038,000 | $ 77,779,000 | $ 54,400,000 |  |  |  |
Dividend per share declared (in dollars per share) | $ 0.75 | $ 0.73 | $ 0.69 |  |  |  |
Shares authorized under repurchase program |  |  |  |  |  |  | $ 250,000,000.0
Additional authorized amount |  |  |  | $ 250,000,000.0 |  | $ 250,000,000 |
Remaining authorized amended repurchase amount |  |  |  |  | $ 56,100,000 |  |
Remaining authorized repurchase amount | $ 279,700,000 |  |  | $ 300,000,000.0 |  |  |
Remaining number of shares authorized to be repurchase | 2,213,425 |  |  |  |  |  |
Stock repurchased during period as percentage of shares outstanding | 2.00% |  |  |  |  |  |

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