Acquisitions - Schedule of Acquisition Cost of Shopping Centers (Detail) (Shopping Centers Acquired [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Land	$ 402,289	$ 118,360
Buildings	1,338,851	461,794
Tenant improvements	35,334	14,479
Other assets	19,536	10,407
Assets acquired	2,139,370	701,199
Less: Mortgage debt assumed	(969,734)	(25,414)
Less: Below-market leases	(79,499)	(26,162)
Less: Other liabilities assumed	(26,456)	(4,118)
Net assets acquired	1,063,681	645,505
In-Place Leases, Including Lease Origination Costs and Fair Market Value of Leases [Member]
Business Acquisition [Line Items]
Intangible assets acquired	186,370	51,059
Weighted Average Amortization Period	5 years 2 months 12 days	6 years 2 months 12 days
Tenant Relations [Member]
Business Acquisition [Line Items]
Intangible assets acquired	$ 156,990	$ 45,100
Weighted Average Amortization Period	5 years 7 months 6 days	9 years 3 months 18 days
Below-Market Leases [Member]
Business Acquisition [Line Items]
Weighted Average Amortization Period	15 years 10 months 24 days	18 years 4 months 24 days

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.

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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 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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The amount of liabilities that an entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition that are not presented as a separate disclosure or otherwise listed in the existing taxonomy. 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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