Summary of Significant Accounting Policies - Impairment to Equity-based Compensation (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) item	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Impairment losses	$ 0	$ 0	$ 0	$ 0
Number of reporting units | item			1
Amortization of the deferred financing costs	1,000,000.0	1,000,000.0	$ 2,968,000	2,935,000
Amortization of deferred leasing costs	6,800,000	6,700,000	19,300,000	17,700,000
Aggregate allowance for doubtful accounts	5,600,000		5,600,000		$ 2,300,000
Deferred income	55,422,000		55,422,000		$ 39,169,000
Amortization of deferred revenue	5,300,000	4,000,000.0	13,700,000	11,100,000
Company recorded equity-based compensation expense net of repurchased awards and forfeits	8,200,000	$ 4,500,000	19,200,000	$ 12,100,000
Accelerated cost	$ 900,000		$ 900,000