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Segment Information - Company's Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total revenues	$ 254,788	$ 257,135	$ 257,323	$ 258,825	$ 256,768	$ 245,355	$ 242,040	$ 241,512	$ 1,028,071	$ 985,675	$ 829,935
Rental operation expenses									(293,693)	(281,107)	(239,179)
Net operating income (loss)									734,378	704,568	590,756
Impairment charges									(279,021)	(29,175)	(19,044)
Depreciation and amortization									(402,045)	(402,825)	(296,560)
Interest income									29,213	15,927	23,541
Other income (expense), net									(1,739)	(12,262)	(6,408)
Unallocated expenses									(321,395)	(323,459)	(296,611)
Equity in net (loss) income of joint ventures									(3,135)	10,989	6,819
Impairment of joint venture investments									(1,909)	(30,652)	(980)
Gain on sale and change in control of interests, net									7,772	87,996	19,906
(Loss) income from continuing operations									(237,881)	21,107	21,419
Total gross real estate assets	10,128,199				10,335,785				10,128,199	10,335,785	10,228,061
Notes receivable, net	42,534				56,245				42,534	56,245	78,338
Operating Segments [Member] | Shopping Center [Member]
Segment Reporting Information [Line Items]
Total revenues									1,027,934	985,479	829,890
Rental operation expenses									(293,578)	(281,005)	(238,727)
Net operating income (loss)									734,356	704,474	591,163
Impairment charges									(279,021)	(29,175)	(19,044)
Depreciation and amortization									(402,045)	(402,825)	(296,560)
Equity in net (loss) income of joint ventures									(3,135)	10,989	(10,020)
Impairment of joint venture investments									(1,909)	(30,652)	(980)
Gain on sale and change in control of interests, net									7,772	87,996	19,906
Total gross real estate assets	10,128,199				10,335,785				10,128,199	10,335,785	10,228,061
Operating Segments [Member] | Loan Investments [Member]
Segment Reporting Information [Line Items]
Total revenues									137	196	45
Rental operation expenses									(115)	(102)	(452)
Net operating income (loss)									22	94	(407)
Interest income									29,213	15,927	23,541
Other income (expense), net										(500)
Notes receivable, net	437,144				357,754				437,144	357,754	143,989
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Other income (expense), net									(1,739)	(11,762)	(6,408)
Unallocated expenses									(321,395)	(323,459)	(296,611)
Equity in net (loss) income of joint ventures											16,839
Notes receivable, net	$ (394,610)				$ (301,509)				$ (394,610)	$ (301,509)	$ (65,651)

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