Basis of Presentation - Nature of Operations (Details) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
	Mar. 31, 2019 shares	Sep. 30, 2020 USD ($) Property State subsidiary Segment $ / shares shares
Real Estate Properties [Line Items]
Number of real estate properties		26
Number of states in which entity operates | State		9
OP Units redeemed (in units) | shares	6,250,000
Common stock, conversion ratio		1
Period of conversion		1 year
Redeemable noncontrolling interest, equity, other, fair value | $		$ 1.1
Share price (in dollars per share) | $ / shares		$ 0.55
Limited partners' capital account, units outstanding (in shares) | shares		2,022,635
Number of subsidiaries | subsidiary		2
Number of reportable segments | Segment		1
Percentage of consolidated revenue having no single tenant		10.00%
ASU 2016-13
Real Estate Properties [Line Items]
Change in accounting principle, accounting standards update, adopted [true false]		true
Change in accounting principle, accounting standards update, adoption date		Jan. 01, 2020
Change in accounting Principle, accounting standards update, immaterial effect [true false]		true
PREIT Associates, L.P. - Operating Partnership
Real Estate Properties [Line Items]
Interest in the Operating Partnership		97.50%
Mall
Real Estate Properties [Line Items]
Number of real estate properties		20
Other Retail Properties
Real Estate Properties [Line Items]
Number of real estate properties		5
Development Properties
Real Estate Properties [Line Items]
Number of real estate properties		1