Segment Information - Summary of Information about Company's Reportable Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Lease revenue and other property revenue									$ 664,467	$ 891,035	$ 972,571
Revenue from contracts with customers									42,788	30,553	33,234
Total revenue from operations	$ 136,576	$ 144,095	$ 211,516	$ 215,068	$ 217,556	$ 227,424	$ 236,187	$ 240,421	707,255	921,588	1,005,805
Rental operation expenses									(207,992)	(263,743)	(292,134)
Net operating income (loss)									499,263	657,845	713,671
Impairment charges	(900)				(280,100)				(69,324)	(340,480)	(110,906)
Hurricane property credit (loss) and impairment loss, net									(817)	(5,930)
Depreciation and amortization									(242,102)	(346,204)	(389,519)
Interest income									20,437	28,364	37,054
Other income (expense), net									(110,895)	(68,003)	3,322
Unallocated expenses									(202,944)	(265,675)	(278,640)
Equity in net income of joint ventures									9,365	8,837	15,699
Reserve of preferred equity interests									(11,422)	(61,000)	0
Gain (loss) on sale and change in control of interests, net									0	368	(1,087)
Gain on disposition of real estate, net	182,300								225,406	161,164	73,386
Income (loss) before tax expense									116,967	(230,714)	62,980
Total gross real estate assets	4,627,866				8,248,003				4,627,866	8,248,003	9,244,058
Notes receivable, net	19,675				19,675				19,675	19,675	49,503
Operating Segments [Member] | Shopping Center [Member]
Segment Reporting Information [Line Items]
Lease revenue and other property revenue									662,626	890,978	972,527
Revenue from contracts with customers									42,788	30,553	33,234
Total revenue from operations									705,414	921,531	1,005,761
Rental operation expenses									(207,991)	(263,732)	(291,916)
Net operating income (loss)									497,423	657,799	713,845
Impairment charges									(69,324)	(340,480)	(110,906)
Hurricane property credit (loss) and impairment loss, net									(974)	(5,930)
Depreciation and amortization									(242,102)	(346,204)	(389,519)
Equity in net income of joint ventures									9,365	8,837	15,699
Reserve of preferred equity interests									(11,422)	(61,000)
Gain (loss) on sale and change in control of interests, net										368	(1,087)
Gain on disposition of real estate, net									225,406	161,164	73,386
Total gross real estate assets	4,627,866				8,248,003				4,627,866	8,248,003	9,244,058
Operating Segments [Member] | Loan Investments [Member]
Segment Reporting Information [Line Items]
Lease revenue and other property revenue									57	57	44
Revenue from contracts with customers									0	0	0
Total revenue from operations									57	57	44
Rental operation expenses									(1)	(11)	(218)
Net operating income (loss)									56	46	(174)
Interest income									20,437	28,364	37,054
Notes receivable, net	209,566				297,451				209,566	297,451	442,826
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Lease revenue and other property revenue									1,784
Revenue from contracts with customers									0
Total revenue from operations									1,784
Rental operation expenses									0
Net operating income (loss)									1,784
Hurricane property credit (loss) and impairment loss, net									157
Other income (expense), net									(110,895)	(68,003)	3,322
Unallocated expenses									(202,944)	(265,675)	(278,640)
Notes receivable, net	$ (189,891)				$ (277,776)				$ (189,891)	$ (277,776)	$ (393,323)