Acquired Lease Intangibles and Leasing Costs Included in Other Assets and Other Liabilities and Deferred Credits (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired lease intangible assets	$ 11,483	$ 16,536
Net of accumulated amortization of other intangible assets	(4,239)	(3,848)
Acquired lease intangible liabilities, net	54,350	48,612
In-place leases
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired lease intangible assets	72,598	57,843
Net of accumulated amortization of other intangible assets	(38,290)	(28,981)
Acquired lease intangible assets, net	34,308
Above Market Leases
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired lease intangible assets	32,846	32,820
Net of accumulated amortization of other intangible assets	(21,363)	(16,284)
Acquired lease intangible assets, net	11,483
Acquired lease intangible assets
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired lease intangible assets, net	45,791	45,398
Below Market Leases
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired lease intangible assets, net	54,350
Below market leases	80,071	68,958
Accumulated accretion	(25,721)	(20,346)
Acquired lease intangible liabilities, net	$ 54,350	$ 48,612