Business Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Revenue	$ 50,595	$ 49,756	$ 155,828	$ 147,751
Expenses	(12,080)	(11,907)	(37,150)	(35,642)
Income from real estate	38,515	37,849	118,678	112,109
Interest expense and amortization of deferred debt costs	(11,584)	(11,738)	(34,537)	(35,164)
General and administrative	(3,837)	(3,501)	(12,540)	(10,830)
Acquisition related costs	(359)	(99)	(738)	(99)
Predevelopment expenses	0	(60)	(503)	(3,642)
Subtotal	22,735	22,451	70,360	62,374
Depreciation and amortization of deferred leasing costs	(10,256)	(10,492)	(30,745)	(39,316)
Gain on sale of property	0	0	6,069	0
Change in fair value of derivatives	1	46	(6)	107
Loss on early extinguishment of debt	0	(497)	0	(497)
Net Income	12,480	11,508	45,678	22,668
Capital investment	37,567	8,731	69,912	20,107
Total assets	1,258,528	1,199,172	1,258,528	1,199,172	1,198,675
Shopping Centers
Segment Reporting Information [Line Items]
Revenue	37,506	36,486	116,381	108,282
Expenses	(8,088)	(7,732)	(25,580)	(22,709)
Income from real estate	29,418	28,754	90,801	85,573
Interest expense and amortization of deferred debt costs	0	0	0	0
General and administrative	0	0	0	0
Acquisition related costs	(359)	(99)	(738)	(99)
Predevelopment expenses	0	0	0	0
Subtotal	29,059	28,655	90,063	85,474
Depreciation and amortization of deferred leasing costs	(7,055)	(6,785)	(20,863)	(20,527)
Gain on sale of property	0		6,069
Change in fair value of derivatives	0	0	0	0
Loss on early extinguishment of debt		0		0
Net Income	22,004	21,870	75,269	64,947
Capital investment	31,541	8,025	55,865	13,829
Total assets	942,441	892,716	942,441	892,716
Mixed-Use Properties
Segment Reporting Information [Line Items]
Revenue	13,066	13,257	39,389	39,412
Expenses	(3,992)	(4,175)	(11,570)	(12,933)
Income from real estate	9,074	9,082	27,819	26,479
Interest expense and amortization of deferred debt costs	0	0	0	0
General and administrative	0	0	0	0
Acquisition related costs	0	0	0	0
Predevelopment expenses	0	(60)	(503)	(3,642)
Subtotal	9,074	9,022	27,316	22,837
Depreciation and amortization of deferred leasing costs	(3,201)	(3,707)	(9,882)	(18,789)
Gain on sale of property	0		0
Change in fair value of derivatives	0	0	0	0
Loss on early extinguishment of debt		0		0
Net Income	5,873	5,315	17,434	4,048
Capital investment	6,026	706	14,047	6,278
Total assets	301,043	294,149	301,043	294,149
Corporate and Other
Segment Reporting Information [Line Items]
Revenue	23	13	58	57
Expenses	0	0	0	0
Income from real estate	23	13	58	57
Interest expense and amortization of deferred debt costs	(11,584)	(11,738)	(34,537)	(35,164)
General and administrative	(3,837)	(3,501)	(12,540)	(10,830)
Acquisition related costs	0	0	0	0
Predevelopment expenses	0	0	0	0
Subtotal	(15,398)	(15,226)	(47,019)	(45,937)
Depreciation and amortization of deferred leasing costs	0	0	0	0
Gain on sale of property	0		0
Change in fair value of derivatives	1	46	(6)	107
Loss on early extinguishment of debt		(497)		(497)
Net Income	(15,397)	(15,677)	(47,025)	(46,327)
Capital investment	0	0	0	0
Total assets	$ 15,044	$ 12,307	$ 15,044	$ 12,307