Segment Information - Summary of Information about Company's Reportable Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Rental income									$ 443,421	$ 650,594	$ 875,890
Other income									63,682	49,777	37,198
Business interruption income									885	6,884	8,500
Total revenue from operations	$ 125,784	$ 122,525	$ 128,657	$ 131,022	$ 136,576	$ 144,095	$ 211,516	$ 215,068	507,988	707,255	921,588
Rental operation expenses									(139,663)	(207,992)	(263,743)
Net operating income									368,325	499,263	657,845
Impairment charges									(3,370)	(69,324)	(340,480)
Hurricane property (loss) credit and impairment loss, net										(817)	(5,930)
Depreciation and amortization									(165,087)	(242,102)	(346,204)
Interest income									18,009	20,437	28,364
Other income, net									357	(110,895)	(68,003)
Unallocated expenses									(143,105)	(202,944)	(265,675)
Equity in net income of joint ventures									11,519	9,365	8,837
Reserve of preferred equity interests, net									(15,544)	(11,422)	(61,000)
Gain on sale and change in control of interests, net									0	0	368
Gain on disposition of real estate, net					185,800				31,380	225,406	161,164
Income (loss) before tax expense									102,484	116,967	(230,714)
Total gross real estate assets	4,709,812				4,627,866				4,709,812	4,627,866	8,248,003
Notes receivable, net	7,541				19,675				7,541	19,675	19,675
Operating Segments [Member] | Shopping Center [Member]
Segment Reporting Information [Line Items]
Rental income									443,421	650,594	875,890
Other income									63,632	49,720	37,141
Business interruption income									885	5,100	8,500
Total revenue from operations									507,938	705,414	921,531
Rental operation expenses									(139,653)	(207,991)	(263,732)
Net operating income									368,285	497,423	657,799
Impairment charges									(3,370)	(69,324)	(340,480)
Hurricane property (loss) credit and impairment loss, net										(974)	(5,930)
Depreciation and amortization									(165,087)	(242,102)	(346,204)
Equity in net income of joint ventures									11,519	9,365	8,837
Gain on sale and change in control of interests, net											368
Gain on disposition of real estate, net									31,380	225,406	161,164
Total gross real estate assets	4,709,812				4,627,866				4,709,812	4,627,866	8,248,003
Operating Segments [Member] | Loan Investments [Member]
Segment Reporting Information [Line Items]
Rental income									0
Other income									50	57	57
Business interruption income									0	0	0
Total revenue from operations									50	57	57
Rental operation expenses									(10)	(1)	(11)
Net operating income									40	56	46
Interest income									18,009	20,437	28,364
Reserve of preferred equity interests, net									(15,544)	(11,422)	(61,000)
Notes receivable, net	120,130				209,566				120,130	209,566	297,451
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Rental income									0	0
Other income									0	0
Business interruption income										1,784
Total revenue from operations										1,784
Rental operation expenses									0	0
Net operating income									0	1,784
Hurricane property (loss) credit and impairment loss, net										157
Other income, net									357	(110,895)	(68,003)
Unallocated expenses									(143,105)	(202,944)	(265,675)
Notes receivable, net	$ (112,589)				$ (189,891)				$ (112,589)	$ (189,891)	$ (277,776)