Summary of Significant Accounting Policies - Segment and Geographic Information (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of operating segments | segment									1
Number of reportable segments | segment									1
Total operating revenues	$ 1,062,609	$ 1,024,668	$ 992,995	$ 823,337	$ 787,463	$ 806,466	$ 800,797	$ 814,515	$ 3,903,609	$ 3,209,241	$ 3,046,478
Net investments in real estate	21,731,112				15,517,684				21,731,112	15,517,684
Outside the United States
Summary Of Significant Accounting Policies [Line Items]
Total operating revenues									1,300,000	600,000	600,000
Net investments in real estate	9,300,000				3,700,000				9,300,000	3,700,000	3,800,000
United States
Summary Of Significant Accounting Policies [Line Items]
Total operating revenues									2,600,000	2,600,000	2,500,000
Net investments in real estate	$ 11,300,000				$ 10,600,000				$ 11,300,000	$ 10,600,000	$ 11,100,000