Segment Information - Summary of Information about Company's Reportable Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total revenues	$ 236,187	$ 257,321	$ 476,608	$ 511,744
Rental operation expenses	(65,894)	(71,864)	(133,214)	(144,906)
Net operating income (loss)	170,293	185,457	343,394	366,838
Impairment charges	(28,096)	0	(50,069)	0
Depreciation and amortization	(90,276)	(97,698)	(181,160)	(194,600)
Interest income	7,166	9,446	15,558	18,496
Other income (expense), net	(954)	2,081	(958)	3,854
Unallocated expenses	(72,137)	(72,756)	(155,259)	(148,987)
Equity in net (loss) income of joint ventures	(717)	1,117	(2,382)	15,538
Reserve of preferred equity interests	0		(76,000)	0
(Loss) income from continuing operations	(14,721)	27,647	(106,876)	61,139
Total gross real estate assets	8,972,219	9,949,961	8,972,219	9,949,961
Notes receivable, net	19,590	47,294	19,590	47,294	$ 49,503
Operating Segments [Member] | Shopping Center [Member]
Segment Reporting Information [Line Items]
Total revenues	236,173	257,310	476,580	511,727
Rental operation expenses	(65,880)	(71,747)	(133,201)	(144,750)
Net operating income (loss)	170,293	185,563	343,379	366,977
Impairment charges	(28,096)		(50,069)
Depreciation and amortization	(90,276)	(97,698)	(181,160)	(194,600)
Equity in net (loss) income of joint ventures	(717)	1,117	(2,382)	15,538
Total gross real estate assets	8,972,219	9,949,961	8,972,219	9,949,961
Operating Segments [Member] | Loan Investments [Member]
Segment Reporting Information [Line Items]
Total revenues	14	11	28	17
Rental operation expenses	(14)	(117)	(13)	(156)
Net operating income (loss)	0	(106)	15	(139)
Interest income	7,166	9,446	15,558	18,496
Reserve of preferred equity interests			(76,000)
Notes receivable, net	337,761	447,074	337,761	447,074
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Other income (expense), net	(954)	2,081	(958)	3,854
Unallocated expenses	(72,137)	(72,756)	(155,259)	(148,987)
Notes receivable, net	$ (318,171)	$ (399,780)	$ (318,171)	$ (399,780)