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