Segmented Information - Additional Information (Details)	12 Months Ended
	Dec. 31, 2019 segment	Mar. 31, 2020 a state
Segment Reporting Information [Line Items]
Number of reportable segments | segment	2
Number of states in which entity operates		27
Land subject to ground leases (acres) | a		192
Penn
Segment Reporting Information [Line Items]
Number of states in which entity operates		32
Prime
Segment Reporting Information [Line Items]
Number of states in which entity operates		40