Acquisitions - Schedule of Acquisition Cost of Shopping Centers (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Less: Mortgage debt assumed at fair value	$ (293,300)	$ (969,700)	$ (271,600)
Shopping Centers Acquired [Member]
Business Acquisition [Line Items]
Land	147,559	402,289
Buildings	399,274	1,338,851
Tenant improvements	9,625	35,334
Construction in progress	76,214	0
Other assets	4,402	19,536
Assets acquired	732,586	2,139,370
Less: Mortgage debt assumed at fair value	(293,288)	(969,734)
Less: Below-market leases	(28,115)	(79,499)
Less: Other liabilities assumed	(3,478)	(26,456)
Net assets acquired	407,705	1,063,681
Shopping Centers Acquired [Member] \| In-Place Leases (Including Lease Origination Costs and Fair Market Value of Leases) [Member]
Business Acquisition [Line Items]
Intangible assets acquired	59,684	186,370
Weighted Average Amortization Period	7 years 1 month 6 days	5 years 2 months 12 days
Shopping Centers Acquired [Member] \| Tenant Relations [Member]
Business Acquisition [Line Items]
Intangible assets acquired	$ 35,828	$ 156,990
Weighted Average Amortization Period	7 years 8 months 12 days	5 years 7 months 6 days
Shopping Centers Acquired [Member] \| Below-Market Leases [Member]
Business Acquisition [Line Items]
Weighted Average Amortization Period	19 years 1 month 6 days	15 years 10 months 24 days

Amount of tenant improvements acquired as part of a real property acquisition with a finite life.

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Amount of construction in progress acquired as part of a real property acquisition at the acquisition date.

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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.

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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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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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Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date.

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- Definition

The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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