Acquired Lease Intangibles and Leasing Costs Included in Other Assets and Other Liabilities and Deferred Credits (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired lease intangible assets	$ 10,418	$ 11,483
Net of accumulated amortization of other intangible assets	(4,316)	(4,239)
Acquired lease intangible liabilities, net	52,804	54,350
In-place leases
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired lease intangible assets	71,945	72,598
Net of accumulated amortization of other intangible assets	(40,402)	(38,290)
Above Market Leases
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired lease intangible assets	30,654	32,846
Net of accumulated amortization of other intangible assets	(20,236)	(21,363)
Acquired lease intangible assets
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired lease intangible assets, net	41,961	45,791
Below Market Leases
Acquired Finite-Lived Intangible Assets [Line Items]
Below market leases	79,933	80,071
Accumulated accretion	(27,129)	(25,721)
Acquired lease intangible liabilities, net	$ 52,804	$ 54,350