Segment Information - Summary of Information about Company's Reportable Operating Segments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Rental income	$ 414,864	$ 443,421	$ 650,594
Other income	45,469	63,682	49,777
Business interruption income	0	885	6,884
Total revenue from operations	460,333	507,988	707,255
Rental operation expenses	(138,402)	(139,663)	(207,992)
Net operating income	321,931	368,325	499,263
Impairment charges	(5,200)	(3,370)	(69,324)
Hurricane property (loss) credit and impairment loss, net			(817)
Depreciation and amortization	(170,669)	(165,087)	(242,102)
Interest income	11,888	18,009	20,437
Other expense, net	(18,400)	357	(110,895)
Unallocated expenses	(130,485)	(143,105)	(202,944)
Equity in net income of joint ventures	1,516	11,519	9,365
Reserve of preferred equity interests, net	(19,393)	(15,544)	(11,422)
Gain on sale and change in control of interests, net	45,464	0	0
Gain on disposition of real estate, net	1,069	31,380	225,406
Income before tax expense	37,721	102,484	116,967
Total gross real estate assets	4,989,388	4,709,812	4,627,866
Notes receivable, net	0	7,541	19,675
Operating Segments [Member] | Shopping Centers [Member]
Segment Reporting Information [Line Items]
Rental income	414,864	443,421	650,594
Other income	45,456	63,632	49,720
Business interruption income		885	5,100
Total revenue from operations	460,320	507,938	705,414
Rental operation expenses	(138,402)	(139,653)	(207,991)
Net operating income	321,918	368,285	497,423
Impairment charges	(5,200)	(3,370)	(69,324)
Hurricane property (loss) credit and impairment loss, net			(974)
Depreciation and amortization	(170,669)	(165,087)	(242,102)
Interest income	0	0	0
Other expense, net	0	0	0
Unallocated expenses	0	0	0
Equity in net income of joint ventures	1,516	11,519	9,365
Reserve of preferred equity interests, net	0	0	0
Gain on sale and change in control of interests, net	45,464
Gain on disposition of real estate, net	1,069	31,380	225,406
Income before tax expense	0	0	0
Total gross real estate assets	4,989,388	4,709,812	4,627,866
Notes receivable, net		0	0
Operating Segments [Member] | Loan Investments [Member]
Segment Reporting Information [Line Items]
Rental income	0	0	0
Other income	13	50	57
Business interruption income		0	0
Total revenue from operations	13	50	57
Rental operation expenses	0	(10)	(1)
Net operating income	13	40	56
Impairment charges	0	0	0
Hurricane property (loss) credit and impairment loss, net			0
Depreciation and amortization	0	0	0
Interest income	11,888	18,009	20,437
Other expense, net	0	0	0
Unallocated expenses	0	0	0
Equity in net income of joint ventures	0	0	0
Reserve of preferred equity interests, net	(19,393)	(15,544)	(11,422)
Gain on sale and change in control of interests, net	0
Gain on disposition of real estate, net	0	0	0
Income before tax expense	0	0	0
Total gross real estate assets	0	0	0
Notes receivable, net		120,130	209,566
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Rental income	0	0	0
Other income	0	0	0
Business interruption income		0	1,784
Total revenue from operations	0	0	1,784
Rental operation expenses	0	0	0
Net operating income	0	0	1,784
Impairment charges	0	0	0
Hurricane property (loss) credit and impairment loss, net			157
Depreciation and amortization	0	0	0
Interest income	0	0	0
Other expense, net	(18,400)	357	(110,895)
Unallocated expenses	(130,485)	(143,105)	(202,944)
Equity in net income of joint ventures	0	0	0
Reserve of preferred equity interests, net	0	0	0
Gain on sale and change in control of interests, net	0
Gain on disposition of real estate, net	0	0	0
Income before tax expense	0	0	0
Total gross real estate assets	$ 0	0	0
Notes receivable, net		$ (112,589)	$ (189,891)