Segment Information - Summary of Information about Company's Reportable Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Rental income	$ 112,221	$ 203,766
Other income	18,801	11,302
Total revenue from operations	131,022	215,068
Rental operation expenses	(36,584)	(65,049)
Net operating income	94,438	150,019
Impairment charges	(620)	(30,444)
Depreciation and amortization	(42,608)	(74,424)
Interest income	4,521	5,341
Other income (expense), net	153	(61,607)
Unallocated expenses	(35,838)	(56,886)
Hurricane property loss		(750)
Equity in net income of joint ventures	1,043	8,786
Reserve of preferred equity interests, net	(1,099)	(3,961)
Gain on disposition of real estate, net	16,377	10,011
Income (loss) before tax expense	36,367	(53,915)
Total gross real estate assets	4,583,366	8,074,030
Notes receivable, net	19,675	19,675	$ 19,675
Operating Segments [Member] | Shopping Center [Member]
Segment Reporting Information [Line Items]
Rental income	112,207	203,752
Other income	18,801	11,302
Total revenue from operations	131,008	215,054
Rental operation expenses	(36,584)	(65,049)
Net operating income	94,424	150,005
Impairment charges	(620)	(30,444)
Depreciation and amortization	(42,608)	(74,424)
Hurricane property loss		(750)
Equity in net income of joint ventures	1,043	8,786
Gain on disposition of real estate, net	16,377	10,011
Total gross real estate assets	4,583,366	8,074,030
Operating Segments [Member] | Loan Investments [Member]
Segment Reporting Information [Line Items]
Rental income	14	14
Other income	0	0
Total revenue from operations	14	14
Rental operation expenses	0	0
Net operating income	14	14
Interest income	4,521	5,341
Reserve of preferred equity interests, net	(1,099)	(3,961)
Notes receivable, net	195,795	256,600
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Other income (expense), net	153	(61,607)
Unallocated expenses	(35,838)	(56,886)
Notes receivable, net	$ (176,120)	$ (236,925)