Segment Information - Summary of Information about Company's Reportable Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total revenues	$ 240,261	$ 253,800	$ 257,321	$ 254,423	$ 254,788	$ 257,135	$ 257,323	$ 258,825	$ 1,005,805	$ 1,028,071	$ 985,675
Rental operation expenses									(277,084)	(293,693)	(281,107)
Net operating income (loss)									728,721	734,378	704,568
Impairment charges									(110,906)	(279,021)	(29,175)
Depreciation and amortization									(389,519)	(402,045)	(402,825)
Interest income									37,054	29,213	15,927
Other income (expense), net									3,322	(1,739)	(12,262)
Unallocated expenses									(295,471)	(321,395)	(323,459)
Equity in net income (loss) of joint ventures									15,699	(3,135)	10,989
Impairment of joint venture investments									0	(1,909)	(30,652)
(Loss) gain on sale and change in control of interests, net									(1,087)	7,772	87,996
(Loss) income from continuing operations									(12,187)	(237,881)	21,107
Total gross real estate assets	9,244,058				10,128,199				9,244,058	10,128,199	10,335,785
Notes receivable, net	49,503				42,534				49,503	42,534	56,245
Operating Segments [Member] | Shopping Center [Member]
Segment Reporting Information [Line Items]
Total revenues									1,005,761	1,027,934	985,479
Rental operation expenses									(276,866)	(293,578)	(281,005)
Net operating income (loss)									728,895	734,356	704,474
Impairment charges									(110,906)	(279,021)	(29,175)
Depreciation and amortization									(389,519)	(402,045)	(402,825)
Equity in net income (loss) of joint ventures									15,699	(3,135)	10,989
Impairment of joint venture investments										(1,909)	(30,652)
(Loss) gain on sale and change in control of interests, net									(1,087)	7,772	87,996
Total gross real estate assets	9,244,058				10,128,199				9,244,058	10,128,199	10,335,785
Operating Segments [Member] | Loan Investments [Member]
Segment Reporting Information [Line Items]
Total revenues									44	137	196
Rental operation expenses									(218)	(115)	(102)
Net operating income (loss)									(174)	22	94
Interest income									37,054	29,213	15,927
Other income (expense), net											(500)
Notes receivable, net	442,826				437,144				442,826	437,144	357,754
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Other income (expense), net									3,322	(1,739)	(11,762)
Unallocated expenses									(295,471)	(321,395)	(323,459)
Notes receivable, net	$ (393,323)				$ (394,610)				$ (393,323)	$ (394,610)	$ (301,509)