Financing Activity - Applicable Credit Spread Over Libor at Various Leverage Levels (Detail)	9 Months Ended						3 Months Ended	9 Months Ended
	Sep. 30, 2013 2013 Revolving Credit Facility [Member] Minimum [Member] Level 2 [Member]	Sep. 30, 2013 2013 Revolving Credit Facility [Member] Minimum [Member] Level 3 [Member]	Sep. 30, 2013 2013 Revolving Credit Facility [Member] Minimum [Member] Level 4 [Member]	Sep. 30, 2013 2013 Revolving Credit Facility [Member] Maximum [Member] Level 1[Member]	Sep. 30, 2013 2013 Revolving Credit Facility [Member] Maximum [Member] Level 2 [Member]	Sep. 30, 2013 2013 Revolving Credit Facility [Member] Maximum [Member] Level 3 [Member]	Sep. 30, 2013 Lycoming Mall [Member] Mortgage Loan February [Member] London Interbank Offered Rate (LIBOR) [Member]	Sep. 30, 2013 Credit Spread Option [Member] 2013 Revolving Credit Facility [Member] Level 1[Member]	Sep. 30, 2013 Credit Spread Option [Member] 2013 Revolving Credit Facility [Member] Level 2 [Member]	Sep. 30, 2013 Credit Spread Option [Member] 2013 Revolving Credit Facility [Member] Level 3 [Member]	Sep. 30, 2013 Credit Spread Option [Member] 2013 Revolving Credit Facility [Member] Level 4 [Member]
Schedule Of Maximum Leverage Ratio [Line Items]
Ratio of Total Liabilities to Gross Asset Value	0.450	0.500	0.550	0.450	0.500	0.550
Applicable Margin								1.50%	1.70%	1.85%	2.05%
Stated Interest Rate							2.75%