Business Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenue	$ 48,809	$ 47,372	$ 97,995	$ 94,361
Expenses	(11,759)	(11,685)	(23,735)	(23,610)
Income from real estate	37,050	35,687	74,260	70,751
Interest expense and amortization of deferred debt costs	(11,709)	(12,554)	(23,426)	(25,287)
Predevelopment expenses	(1,233)		(3,582)
General and administrative	(3,925)	(3,784)	(7,329)	(7,031)
Subtotal	20,183	19,349	39,923	38,433
Depreciation and amortization of deferred leasing costs	(12,472)	(9,749)	(28,824)	(19,507)
Change in fair value of derivatives	51	(16)	61	(19)
Income from operation of property sold		11		8
Net Income	7,762	9,595	11,160	18,915
Capital investment	6,312	3,372	11,376	7,272
Total assets	1,191,610	1,201,070	1,191,610	1,201,070	1,207,309
Shopping Centers
Segment Reporting Information [Line Items]
Revenue	35,749	34,214	71,796	68,153
Expenses	(7,222)	(7,410)	(14,977)	(14,992)
Income from real estate	28,527	26,804	56,819	53,161
Subtotal	28,527	26,804	56,819	53,161
Depreciation and amortization of deferred leasing costs	(6,913)	(6,272)	(13,742)	(12,638)
Income from operation of property sold		11		8
Net Income	21,614	20,543	43,077	40,531
Capital investment	2,305	1,219	5,804	3,472
Total assets	885,816	858,431	885,816	858,431
Mixed-Use Properties
Segment Reporting Information [Line Items]
Revenue	13,047	13,118	26,155	26,156
Expenses	(4,537)	(4,275)	(8,758)	(8,618)
Income from real estate	8,510	8,843	17,397	17,538
Predevelopment expenses	(1,233)		(3,582)
Subtotal	7,277	8,843	13,815	17,538
Depreciation and amortization of deferred leasing costs	(5,559)	(3,477)	(15,082)	(6,869)
Net Income	1,718	5,366	(1,267)	10,669
Capital investment	4,007	2,153	5,572	3,800
Total assets	292,048	304,044	292,048	304,044
Corporate and Other
Segment Reporting Information [Line Items]
Revenue	13	40	44	52
Income from real estate	13	40	44	52
Interest expense and amortization of deferred debt costs	(11,709)	(12,554)	(23,426)	(25,287)
General and administrative	(3,925)	(3,784)	(7,329)	(7,031)
Subtotal	(15,621)	(16,298)	(30,711)	(32,266)
Change in fair value of derivatives	51	(16)	61	(19)
Net Income	(15,570)	(16,314)	(30,650)	(32,285)
Total assets	$ 13,746	$ 38,595	$ 13,746	$ 38,595