Other Liabilities and Deferred Credits (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule of Other Liabilities [Line Items]
Acquired below market leases, net	$ 54,350	$ 48,612
Prepaid rent and deferred revenue	6,383	4,784
Straight-line rent liability	63	433
Deferred rent expense	1,008	1,122
Deferred compensation	637	520
Deferred tax Liability	320
Other liabilities	50	108
Total other liabilities and deferred credits	$ 62,811	$ 55,579