Segment Information - Summary of Information about Company's Reportable Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Rental income	$ 112,529	$ 112,221
Other income	16,781	18,801
Total revenue from operations	129,310	131,022
Rental operation expenses	(36,137)	(36,584)
Net operating income	93,173	94,438
Impairment charges	0	(620)
Depreciation and amortization	(42,993)	(42,608)
Interest income	3,485	4,521
Other income (expense), net	(17,409)	153
Unallocated expenses	(31,963)	(35,838)
Equity in net income of joint ventures	2,171	1,043
Reserve of preferred equity interests, net	(18,057)	(1,099)
Gain on sale of joint venture interest	45,681	0
Gain on disposition of real estate, net	773	16,377
Income before tax expense	34,861	36,367
Total gross real estate assets	4,726,969	4,583,366
Notes receivable, net	0	19,675	$ 7,541
Operating Segments [Member] | Shopping Center [Member]
Segment Reporting Information [Line Items]
Rental income	112,529	112,221
Other income	16,768	18,787
Total revenue from operations	129,297	131,008
Rental operation expenses	(36,137)	(36,584)
Net operating income	93,160	94,424
Impairment charges		(620)
Depreciation and amortization	(42,993)	(42,608)
Interest income	0	0
Other income (expense), net	0	0
Unallocated expenses	0	0
Equity in net income of joint ventures	2,171	1,043
Reserve of preferred equity interests, net	0	0
Gain on sale of joint venture interest	45,681
Gain on disposition of real estate, net	773	16,377
Income before tax expense	0	0
Total gross real estate assets	4,726,969	4,583,366
Notes receivable, net	0	0
Operating Segments [Member] | Loan Investments [Member]
Segment Reporting Information [Line Items]
Rental income	0	0
Other income	13	14
Total revenue from operations	13	14
Rental operation expenses	0	0
Net operating income	13	14
Impairment charges		0
Depreciation and amortization	0	0
Interest income	3,485	4,521
Other income (expense), net	0	0
Unallocated expenses	0	0
Equity in net income of joint ventures	0	0
Reserve of preferred equity interests, net	(18,057)	(1,099)
Gain on sale of joint venture interest	0
Gain on disposition of real estate, net	0	0
Income before tax expense	0	0
Total gross real estate assets	0	0
Notes receivable, net	93,909	195,795
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Rental income	0	0
Other income	0	0
Total revenue from operations	0	0
Rental operation expenses	0	0
Net operating income	0	0
Impairment charges		0
Depreciation and amortization	0	0
Interest income	0	0
Other income (expense), net	(17,409)	153
Unallocated expenses	(31,963)	(35,838)
Equity in net income of joint ventures	0	0
Reserve of preferred equity interests, net	0	0
Gain on sale of joint venture interest	0
Gain on disposition of real estate, net	0	0
Income before tax expense	0	0
Total gross real estate assets	0	0
Notes receivable, net	$ (93,909)	$ (176,120)