Segment Information - Summary of Information about Company's Reportable Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Rental income	$ 98,079	$ 112,274	$ 210,608	$ 224,495
Other income	9,492	16,383	26,273	35,184
Total revenue from operations	107,571	128,657	236,881	259,679
Rental operation expenses	(33,867)	(36,541)	(70,004)	(73,125)
Net operating income	73,704	92,116	166,877	186,554
Impairment charges			0	(620)
Depreciation and amortization	(40,873)	(40,060)	(83,866)	(82,668)
Interest income	3,550	4,521	7,035	9,042
Other income (expense), net	(612)	(85)	(18,021)	68
Unallocated expenses	(33,313)	(36,019)	(65,276)	(71,857)
Equity in net (loss) income of joint ventures	(1,513)	1,791	658	2,834
Reserve of preferred equity interests, net	(4,878)	(4,634)	(22,935)	(5,733)
(Loss) gain on sale of joint venture interest	(128)	0	45,553	0
Gain on disposition of real estate, net	2	213	775	16,590
(Loss) income before tax expense	(4,061)	17,843	30,800	54,210
Net operating income (loss)	73,704	92,116	166,877	186,554
Equity in net income of joint ventures	(1,513)	1,791	658	2,834
Total gross real estate assets	4,739,604	4,612,131	4,739,604	4,612,131
Notes receivable, net	0	19,670	0	19,670	$ 7,541
Operating Segments [Member] | Shopping Centers [Member]
Segment Reporting Information [Line Items]
Rental income	98,079	112,274	210,608	224,495
Other income	9,492	16,383	26,260	35,155
Total revenue from operations	107,571	128,657	236,868	259,650
Rental operation expenses	(33,867)	(36,534)	(70,004)	(73,118)
Net operating income	73,704	92,123	166,864	186,532
Impairment charges				(620)
Depreciation and amortization	(40,873)	(40,060)	(83,866)	(82,668)
Interest income	0	0	0	0
Other income (expense), net	0	0	0	0
Unallocated expenses	0	0	0	0
Equity in net (loss) income of joint ventures	(1,513)	1,791	658	2,834
Reserve of preferred equity interests, net	0	0	0	0
(Loss) gain on sale of joint venture interest	(128)		45,553
Gain on disposition of real estate, net	2	213	775	16,590
(Loss) income before tax expense	0	0	0	0
Net operating income (loss)	73,704	92,123	166,864	186,532
Equity in net income of joint ventures	(1,513)	1,791	658	2,834
Total gross real estate assets	4,739,604	4,612,131	4,739,604	4,612,131
Notes receivable, net	0	0	0	0
Operating Segments [Member] | Loan Investments [Member]
Segment Reporting Information [Line Items]
Rental income	0	0	0	0
Other income	0	0	13	29
Total revenue from operations	0	0	13	29
Rental operation expenses	0	(7)	0	(7)
Net operating income	0	(7)	13	22
Impairment charges				0
Depreciation and amortization	0	0	0	0
Interest income	3,550	4,521	7,035	9,042
Other income (expense), net	0	0	0	0
Unallocated expenses	0	0	0	0
Equity in net (loss) income of joint ventures	0	0	0	0
Reserve of preferred equity interests, net	(4,878)	(4,634)	(22,935)	(5,733)
(Loss) gain on sale of joint venture interest	0		0
Gain on disposition of real estate, net	0	0	0	0
(Loss) income before tax expense	0	0	0	0
Net operating income (loss)	0	(7)	13	22
Equity in net income of joint ventures	0	0	0	0
Total gross real estate assets	0	0	0	0
Notes receivable, net	89,049	189,983	89,049	189,983
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Rental income	0	0	0	0
Other income	0	0	0	0
Total revenue from operations	0	0	0	0
Rental operation expenses	0	0	0	0
Net operating income	0	0	0	0
Impairment charges				0
Depreciation and amortization	0	0	0	0
Interest income	0	0	0	0
Other income (expense), net	(612)	(85)	(18,021)	68
Unallocated expenses	(33,313)	(36,019)	(65,276)	(71,857)
Equity in net (loss) income of joint ventures	0	0	0	0
Reserve of preferred equity interests, net	0	0	0	0
(Loss) gain on sale of joint venture interest	0		0
Gain on disposition of real estate, net	0	0	0	0
(Loss) income before tax expense	0	0	0	0
Net operating income (loss)	0	0	0	0
Equity in net income of joint ventures	0	0	0	0
Total gross real estate assets	0	0	0	0
Notes receivable, net	$ (89,049)	$ (170,313)	$ (89,049)	$ (170,313)