Allocation of Purchase Price (Detail) (USD $) In Thousands, unless otherwise specified				3 Months Ended	12 Months Ended					3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2012 Unconsolidated Properties	Mar. 31, 2013 In-Place Leases	Dec. 31, 2012 In-Place Leases	Mar. 31, 2013 Promenade Corporate Center	Mar. 31, 2012 Promenade Corporate Center		Mar. 31, 2013 Tracy Pavilion	Mar. 31, 2013 Purchase Price At Acquisitions Above Market Leases		Mar. 31, 2013 Purchase Price At Acquisitions Below-Market Lease		Mar. 31, 2013 Purchase Price At Acquisitions In-Place Leases		Mar. 31, 2012 EastChase Market Center	Mar. 31, 2012 La Costa Town Center Unconsolidated Properties
Business Acquisition [Line Items]
Building	$ 22,611	$ 64,032	$ 15,054				$ 44,465	[1]	$ 22,611							$ 19,567	$ 15,054	[2]
Land	6,193	8,692	8,383				4,477	[1]	6,193							4,215	8,383	[2]
Above Market Leases	163	1,141	86				781	[1]	163							360	86	[2]
Below Market Leases	(1,136)	(2,045)	(2,069)				(749)	[1]	(1,136)							(1,296)	(2,069)	[2]
In-Place Lease	2,907	5,083	2,046				3,279	[1]	2,907							1,804	2,046	[2]
(Premium)/ Discount								[1]										[2]
Other								[1]										[2]
Purchase Price	$ 30,738	$ 76,903	$ 23,500			$ 52,300	$ 52,253	[1]	$ 30,738							$ 24,650	$ 23,500	[2]
Remaining useful life				80 months	82 months					54 months	[3]	95 months	[3]	62 months	[3]

[1] The purchase price of $52.3 million reflects $13.9 million in cash paid and the issuance of 3,230,769 shares of common stock with a fair value of approximately $39.1 million based on a closing price of $12.11 per share on the date of acquisition. The purchase price noted above is net of master lease agreements between the Company and the seller in the amount of $772,000 (included in other assets on the accompanying condensed consolidated balance sheets) based on the estimated fair value of funds expected to be received from escrow in connection with the acquisition. Payments under the master lease agreements commence upon the expiration of two existing leases in June 2012 and February 2013 (with terms through May 2013 and January 2015, respectively) unless the related spaces are re-leased with base rents equaling or exceeding the master lease payments. In addition, the seller has agreed to reimburse the Company for any expenditures resulting from tenant improvements or leasing commissions related to the spaces to the extent that funds remain available pertaining to the master lease agreements. See Note 17 for a discussion of changes in the fair value of this asset after the initial acquisition.

[2] This property was originally purchased as a consolidated property. However, in September 2012 the La Costa Town Center property was contributed in exchange for proceeds of approximately $21.2 million to a newly-formed entity in which the Company holds a 20% ownership interest (see Note 13). The Company accounts for its remaining equity ownership in the property in a manner similar to the equity method of accounting, which is reflected in the accompanying condensed consolidated balance sheets as an investment in unconsolidated entities.

[3] Weighted-average remaining useful life (months) for recorded intangible assets and liabilities as of the date of acquisition.