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Segment Information - Company's Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Total revenues	$ 254,423	$ 258,825
Rental operation expenses	(73,042)	(76,355)
Net operating income (loss)	181,381	182,470
Impairment charges	0	(279,021)
Depreciation and amortization	(96,902)	(103,015)
Interest income	9,050	7,161
Other income (expense), net	1,773	(3,428)
Unallocated expenses	(76,231)	(86,515)
Equity in net income of joint ventures	14,421	61
Gain on change in control of interests, net	0	14,279
Income (loss) from continuing operations	33,492	(268,008)
Total gross real estate assets	9,973,081	10,047,415
Notes receivable, net	42,592	47,184	$ 42,534
Operating Segments [Member] | Shopping Center [Member]
Segment Reporting Information [Line Items]
Total revenues	254,417	258,770
Rental operation expenses	(73,003)	(76,336)
Net operating income (loss)	181,414	182,434
Impairment charges		(279,021)
Depreciation and amortization	(96,902)	(103,015)
Equity in net income of joint ventures	14,421	61
Gain on change in control of interests, net		14,279
Total gross real estate assets	9,973,081	10,047,415
Operating Segments [Member] | Loan Investments [Member]
Segment Reporting Information [Line Items]
Total revenues	6	55
Rental operation expenses	(39)	(19)
Net operating income (loss)	(33)	36
Interest income	9,050	7,161
Notes receivable, net	440,526	354,205
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Other income (expense), net	1,773	(3,428)
Unallocated expenses	(76,231)	(86,515)
Notes receivable, net	$ (397,934)	$ (307,021)

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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