Acquisitions - Schedule of Acquisition Cost of Shopping Centers (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2013
Shopping centers acquired [Member]
Business Acquisition [Line Items]
Land	$ 31,120
Buildings	148,566
Tenant improvements	4,155
Assets acquired	212,503
Less: Below-market leases	(8,949)
Net assets acquired	203,554
Lease origination costs and fair market value of leases, Acquired-in-Place [Member]
Business Acquisition [Line Items]
Weighted Average Amortization Period	6 years 3 months 18 days
Lease origination costs and fair market value of leases, Acquired-in-Place [Member] \| Shopping centers acquired [Member]
Business Acquisition [Line Items]
Intangible assets acquired	18,184
Tenant relations [Member]
Business Acquisition [Line Items]
Weighted Average Amortization Period	5 years 7 months 6 days
Tenant relations [Member] \| Shopping centers acquired [Member]
Business Acquisition [Line Items]
Intangible assets acquired	$ 10,478
Below-market leases [Member]
Business Acquisition [Line Items]
Weighted Average Amortization Period	18 years 6 months

Business acquisition purchase price allocation tenant improvements.

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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Amount of acquired leases acquired as part of a real property acquisition at below market lease rate with a finite life.

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Amount of assets acquired at the acquisition date.

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- Definition

Amount of facility held for productive use including, but not limited to, office, production, storage and distribution facilities, acquired at the acquisition date.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Amount of real estate acquired, at the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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