Segment Information - Summary of Information about Company's Reportable Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Rental income	$ 95,874	$ 108,060	$ 306,482	$ 332,555
Other income	9,680	13,580	35,953	48,764
Business interruption income	0	885	0	885
Total revenue from operations	105,554	122,525	342,435	382,204
Rental operation expenses	(32,317)	(33,459)	(102,321)	(106,584)
Net operating income	73,237	89,066	240,114	275,620
Impairment charges	0	(2,750)	0	(3,370)
Depreciation and amortization	(41,148)	(40,732)	(125,014)	(123,400)
Interest income	3,445	4,616	10,480	13,658
Other income (expense), net	(186)	(322)	(18,207)	(254)
Unallocated expenses	(31,753)	(36,464)	(97,029)	(108,321)
Equity in net income of joint ventures	250	2,612	908	5,446
Adjustment (reserve) of preferred equity interests, net	3,542	(6,373)	(19,393)	(12,106)
Gain on sale of joint venture interest	82	0	45,635	0
Gain on disposition of real estate, net	218	14,497	993	31,087
Income before tax expense	7,687	24,150	38,487	78,360
Net operating income	73,237	89,066	240,114	275,620
Equity in net income of joint ventures	250	2,612	908	5,446
Total gross real estate assets	4,747,661	4,609,930	4,747,661	4,609,930
Notes receivable, net	0	19,670	0	19,670	$ 7,541
Operating Segments [Member] | Shopping Centers [Member]
Segment Reporting Information [Line Items]
Rental income	95,874	108,060	306,482	332,555
Other income	9,680	13,567	35,940	48,722
Business interruption income		0		0
Total revenue from operations	105,554	121,627	342,422	381,277
Rental operation expenses	(32,317)	(33,456)	(102,321)	(106,574)
Net operating income	73,237	88,171	240,101	274,703
Impairment charges		(2,750)		(3,370)
Depreciation and amortization	(41,148)	(40,732)	(125,014)	(123,400)
Interest income	0	0	0	0
Other income (expense), net	0	0	0	0
Unallocated expenses	0	0	0	0
Equity in net income of joint ventures	250	2,612	908	5,446
Adjustment (reserve) of preferred equity interests, net	0	0	0	0
Gain on sale of joint venture interest	82		45,635
Gain on disposition of real estate, net	218	14,497	993	31,087
Income before tax expense	0	0	0	0
Net operating income	73,237	88,171	240,101	274,703
Equity in net income of joint ventures	250	2,612	908	5,446
Total gross real estate assets	4,747,661	4,609,930	4,747,661	4,609,930
Notes receivable, net	0	0	0	0
Operating Segments [Member] | Loan Investments [Member]
Segment Reporting Information [Line Items]
Rental income	0	0	0	0
Other income	0	13	13	42
Business interruption income		0		0
Total revenue from operations	0	13	13	42
Rental operation expenses	0	(3)	0	(10)
Net operating income	0	10	13	32
Impairment charges		0		0
Depreciation and amortization	0	0	0	0
Interest income	3,445	4,616	10,480	13,658
Other income (expense), net	0	0	0	0
Unallocated expenses	0	0	0	0
Equity in net income of joint ventures	0	0	0	0
Adjustment (reserve) of preferred equity interests, net	3,542	(6,373)	(19,393)	(12,106)
Gain on sale of joint venture interest	0		0
Gain on disposition of real estate, net	0	0	0	0
Income before tax expense	0	0	0	0
Net operating income	0	10	13	32
Equity in net income of joint ventures	0	0	0	0
Total gross real estate assets	0	0	0	0
Notes receivable, net	94,228	182,400	94,228	182,400
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Rental income	0	0	0	0
Other income	0	0	0	0
Business interruption income		885		885
Total revenue from operations	0	885	0	885
Rental operation expenses	0	0	0	0
Net operating income	0	885	0	885
Impairment charges		0		0
Depreciation and amortization	0	0	0	0
Interest income	0	0	0	0
Other income (expense), net	(186)	(322)	(18,207)	(254)
Unallocated expenses	(31,753)	(36,464)	(97,029)	(108,321)
Equity in net income of joint ventures	0	0	0	0
Adjustment (reserve) of preferred equity interests, net	0	0	0	0
Gain on sale of joint venture interest	0		0
Gain on disposition of real estate, net	0	0	0	0
Income before tax expense	0	0	0	0
Net operating income	0	885	0	885
Equity in net income of joint ventures	0	0	0	0
Total gross real estate assets	0	0	0	0
Notes receivable, net	$ (94,228)	$ (162,730)	$ (94,228)	$ (162,730)