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Net Income Per Share - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 17, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Earnings Per Share [Abstract] |  |  |  |  |
Dividends declared per share, in dollars per share |  | $ 0.77 | $ 0.75 | $ 2.27 | $ 2.21
Tangible equity units issued | 16,500,000 |  |  |  |
Tangible equity units proceeds | $ 800,200,000 |  |  |  |
Price for basic share (usd per share) |  |  |  | 0.3134 | 0.3134
Tangible Equity Units, Price for Shares Diluted | $ 0.3839 |  |  | 0.3839 | 0.3839
Difference between basic and diluted net income per share, in dollars per share |  | $ 0.01 | $ 0.01 | $ 0.03 | $ 0.01
Net income allocated to PRS |  | $ 100,000 | $ 200,000 | $ 500,000 | $ 500,000

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