Segment Information - Summary of Information about Company's Reportable Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total revenues	$ 240,421	$ 254,423
Rental operation expenses	(67,320)	(73,042)
Net operating income	173,101	181,381
Impairment charges	(21,973)	0
Depreciation and amortization	(90,884)	(96,902)
Interest income	8,392	9,050
Other income (expense), net	(4)	1,773
Unallocated expenses	(83,122)	(76,231)
Equity in net (loss) income of joint ventures	(1,665)	14,421
Reserve of preferred equity interests	(76,000)	0
(Loss) income from continuing operations	(92,155)	33,492
Total gross real estate assets	9,185,537	9,973,081
Notes receivable, net	49,895	42,592	$ 49,503
Operating Segments [Member] | Shopping Center [Member]
Segment Reporting Information [Line Items]
Total revenues	240,406	254,417
Rental operation expenses	(67,320)	(73,003)
Net operating income	173,086	181,414
Impairment charges	(21,973)
Depreciation and amortization	(90,884)	(96,902)
Equity in net (loss) income of joint ventures	(1,665)	14,421
Total gross real estate assets	9,185,537	9,973,081
Operating Segments [Member] | Loan Investments [Member]
Segment Reporting Information [Line Items]
Total revenues	15	6
Rental operation expenses	0	(39)
Net operating income	15	(33)
Interest income	8,392	9,050
Reserve of preferred equity interests	(76,000)
Notes receivable, net	369,200	440,526
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Other income (expense), net	(4)	1,773
Unallocated expenses	(83,122)	(76,231)
Notes receivable, net	$ (319,305)	$ (397,934)