Acquired Intangible Assets and Liabilities - Summary of Acquired Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Customer Relationship Value
Finite-Lived Intangible Assets [Line Items]
Gross amount	$ 2,982,331	$ 2,993,093
Accumulated amortization	(612,300)	(570,886)
Total	2,370,031	2,422,207
Acquired in-place lease value
Finite-Lived Intangible Assets [Line Items]
Gross amount	1,344,868	1,382,563
Accumulated amortization	(991,366)	(1,004,421)
Total	353,502	378,142
Other
Finite-Lived Intangible Assets [Line Items]
Gross amount	60,213	57,370
Accumulated amortization	(8,907)	(7,107)
Total	51,306	50,263
Acquired above-market leases
Finite-Lived Intangible Assets [Line Items]
Gross amount	275,715	280,216
Accumulated amortization	(238,193)	(236,923)
Total	37,522	43,293
Acquired below-market leases
Finite-Lived Intangible Assets [Line Items]
Below-market lease, gross amount	(383,007)	(401,539)
Below-market lease, accumulated amortization	261,052	270,649
Total	$ (121,955)	$ (130,890)