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Segment Information - Company's Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total revenues	$ 257,323	$ 242,040	$ 516,148	$ 483,552
Operating expenses	(73,826)	(83,417)	(429,202)	(156,309)
Net operating income	183,497	158,623	86,946	327,243
Depreciation and amortization	(99,300)	(95,203)	(202,315)	(198,823)
Interest income	7,211	3,158	14,372	6,286
Other income (expense), net	2,368	(4,100)	(1,060)	(8,283)
Unallocated expenses	(81,131)	(79,361)	(167,646)	(159,997)
Equity in net income of joint ventures	1,642	1,131	1,703	6,621
Impairment of joint venture investments	0	0	0	(9,100)
(Loss) gain on sale and change in control of interests, net	(6,507)	83,830	7,772	83,830
(Loss) income from continuing operations	7,780	68,078	(260,228)	47,777
Total gross real estate assets	10,180,374	10,352,011	10,180,374	10,352,011
Notes receivable, net	47,304	58,863	47,304	58,863	$ 56,245
Operating Segments [Member] | Shopping Center [Member]
Segment Reporting Information [Line Items]
Total revenues	257,283	241,949	516,053	483,425
Operating expenses	(73,809)	(83,416)	(429,166)	(156,258)
Net operating income	183,474	158,533	86,887	327,167
Depreciation and amortization	(99,300)	(95,203)	(202,315)	(198,823)
Equity in net income of joint ventures	1,642	964	1,703	6,135
Impairment of joint venture investments				(9,100)
(Loss) gain on sale and change in control of interests, net	(6,507)	83,830	7,772	83,830
Total gross real estate assets	10,180,374	10,352,011	10,180,374	10,352,011
Operating Segments [Member] | Loan Investments [Member]
Segment Reporting Information [Line Items]
Total revenues	40	91	95	127
Operating expenses	(17)	(1)	(36)	(51)
Net operating income	23	90	59	76
Interest income	7,211	3,158	14,372	6,286
Notes receivable, net	355,911	125,173	355,911	125,173
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Other income (expense), net	2,368	(4,100)	(1,060)	(8,283)
Unallocated expenses	(81,131)	(79,361)	(167,646)	(159,997)
Equity in net income of joint ventures		167		486
Notes receivable, net	$ (308,607)	$ (66,310)	$ (308,607)	$ (66,310)

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Amount of interest income earned from interest bearing assets not separately disclosed.

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