Organization And Summary Of Significant Accounting Policies (Narrative) (Detail) (USD $)	12 Months Ended			3 Months Ended
	Dec. 31, 2014 Property Segment State	Dec. 31, 2013 Property	Dec. 31, 2012	Mar. 31, 2014 Property	Dec. 31, 2011
Summary Of Significant Accounting Policies [Line Items]
Line of credit facilities gross borrowings	$ 140,000,000	$ 512,500,000	$ 215,000,000
Line of credit facilities gross repayments	270,000,000	382,500,000	310,000,000
Number of properties	42
Number of states where the properties located	12
Number of states where the properties operated	11
Interest in the Operating Partnership	97.00%
Amount available for distribution	49,800,000
Closing share price	$ 23.46
Number of outstanding OP units held by limited partners	2,122,215
Number of reportable segment	1
Percentage of consolidated revenue having no single tenants	10.00%
Cash and cash equivalents	40,433,000	34,230,000	33,990,000		21,798,000
Tenant security deposits	3,500,000	3,800,000
Cash paid for interest including interest of discontinued operations	76,600,000	94,100,000	116,400,000
Capitalized interest	604,000	874,000	1,549,000
Gain on sale of remaining interest		78,512,000	947,000
Accrued construction costs	(2,000,000)	2,400,000	(300,000)
Revenue from tenant rent and other tenant-related activities	95.00%
Straight line rent adjustments	1,500,000	1,400,000	2,200,000
Straight-line rent receivable	23,700,000	26,500,000
Account receivable included in accrued income	40,566,000	46,439,000
Number of properties with triggering events	2	1
Holding period of properties		10 years
Goodwill	5,662,000	5,662,000	7,156,000		7,156,000
Amortization of above-market and below-market lease intangibles			300,000
Income tax benefit recognition criteria percentage threshold, minimum	50.00%
Net deferred tax assets	22,700,000	8,700,000
Accrued Income Receivable [Member]
Summary Of Significant Accounting Policies [Line Items]
Account receivable included in accrued income	3,400,000	7,700,000
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Partnership investment, ownership interest	25.00%
Terminal capitalization rate	5.25%	6.25%
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Partnership investment, ownership interest	50.00%
Terminal capitalization rate	12.50%	12.00%
Metroplex Shopping Center [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of properties	32
Power Center [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of properties	6
Number of properties sold				1
Development Properties [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of properties	4
Mixed use development properties [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of properties	2
Other development properties [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of properties	1
Mall [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of properties sold	3
Northeast Tower Center [Member]
Summary Of Significant Accounting Policies [Line Items]
Sale of remaining interest	3,800,000
Gain on sale of remaining interest	900,000
Paxton Towne Centre [Member]
Summary Of Significant Accounting Policies [Line Items]
Goodwill divested	700,000
Christiana Center [Member]
Summary Of Significant Accounting Policies [Line Items]
Goodwill divested	800,000
Value of in-place lease intangibles [Member]
Summary Of Significant Accounting Policies [Line Items]
Amortization of in-place lease intangibles	1,600,000	1,600,000	800,000
Above/(Below) Market Leases [Member]
Summary Of Significant Accounting Policies [Line Items]
Amortization of above-market and below-market lease intangibles	$ 1,000,000	$ 1,000,000	$ 200,000