Real Estate Activity During Nine Months Ended September 30, 2012 (Estimated Amortization Of Acquired Above Market Leases (Net Of Acquired Below Market Leases) And Acquired In-Place Lease Intangible) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Acquired In-Place Lease Intangibles [Member]
Restructuring Cost and Reserve [Line Items]
Period from October 1, 2012 through December 31, 2012	$ 2,533
2013	10,084
2014	7,869
2015	5,927
2016	5,199
Acquired Net Below-Market Lease Intangibles [Member]
Restructuring Cost and Reserve [Line Items]
Period from October 1, 2012 through December 31, 2012	930
2013	3,709
2014	3,374
2015	2,885
2016	$ 2,512