Segment Information - Summary of Information about Company's Reportable Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Lease revenue and other property revenue	$ 207,525	$ 231,797
Revenue from contracts with customers	7,543	8,624
Total revenue from operations	215,068	240,421
Rental operation expenses	(61,780)	(67,320)
Net operating income	153,288	173,101
Impairment charges	(30,444)	(21,973)
Depreciation and amortization	(74,424)	(90,884)
Interest income	5,341	8,392
Other income (expense), net	(61,607)	(4)
Unallocated expenses	(60,137)	(83,122)
Hurricane casualty loss	(750)	0
Equity in net income (loss) of joint ventures	8,786	(1,665)
Reserve of preferred equity interests	(3,961)	(76,000)
Loss from continuing operations	(63,908)	(92,155)
Total gross real estate assets	8,074,030	9,185,537
Notes receivable, net	19,675	49,895	$ 19,675
Operating Segments [Member] | Shopping Center [Member]
Segment Reporting Information [Line Items]
Lease revenue and other property revenue	207,511	231,782
Revenue from contracts with customers	7,543	8,624
Total revenue from operations	215,054	240,406
Rental operation expenses	(61,780)	(67,320)
Net operating income	153,274	173,086
Impairment charges	(30,444)	(21,973)
Depreciation and amortization	(74,424)	(90,884)
Interest income	0	0
Other income (expense), net	0	0
Unallocated expenses	0	0
Hurricane casualty loss	(750)
Equity in net income (loss) of joint ventures	8,786	(1,665)
Reserve of preferred equity interests	0	0
Loss from continuing operations	0	0
Total gross real estate assets	8,074,030	9,185,537
Notes receivable, net	0	0
Operating Segments [Member] | Loan Investments [Member]
Segment Reporting Information [Line Items]
Lease revenue and other property revenue	14	15
Revenue from contracts with customers	0	0
Total revenue from operations	14	15
Rental operation expenses	0	0
Net operating income	14	15
Impairment charges	0	0
Depreciation and amortization	0	0
Interest income	5,341	8,392
Other income (expense), net	0	0
Unallocated expenses	0	0
Hurricane casualty loss	0
Equity in net income (loss) of joint ventures	0	0
Reserve of preferred equity interests	(3,961)	(76,000)
Loss from continuing operations	0	0
Total gross real estate assets	0	0
Notes receivable, net	256,600	369,200
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Lease revenue and other property revenue	0	0
Revenue from contracts with customers	0	0
Total revenue from operations	0	0
Rental operation expenses	0	0
Net operating income	0	0
Impairment charges	0	0
Depreciation and amortization	0	0
Interest income	0	0
Other income (expense), net	(61,607)	(4)
Unallocated expenses	(60,137)	(83,122)
Hurricane casualty loss	0
Equity in net income (loss) of joint ventures	0	0
Reserve of preferred equity interests	0	0
Loss from continuing operations	0	0
Total gross real estate assets	0	0
Notes receivable, net	$ (236,925)	$ (319,305)