Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jan. 01, 2019
Provision for income tax	$ 262,000	$ 265,000	$ 502,000	$ 749,000
Remaining AMT refund received	$ 1,600,000
Right-of-use assets					$ 434,200,000
Lease liabilities					$ 278,300,000
Federal [Member]
Provision for income tax			$ 0