Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jan. 01, 2019
Provision for income tax	$ 187,000	$ 246,000	$ 240,000	$ 484,000
Remaining AMT refunds	1,600,000		1,600,000
Rent payment deferrals	4,500,000
Decrease in rental revenues	$ 4,100,000
Right-of-use assets					$ 434,200,000
Lease liabilities					$ 278,300,000
Federal [Member]
Provision for income tax			$ 0