Acquisitions - Schedule of Acquisition Cost of Shopping Centers (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Less: Below-market leases	$ (155,300)	$ (139,300)
Shopping Center Acquired [Member]
Business Acquisition [Line Items]
Land	74,699	147,559
Buildings	140,668	399,274
Tenant improvements	5,229	9,625
Construction in progress	0	76,214
Other assets	1,252	4,402
Assets acquired	250,274	732,586
Less: Mortgage debt assumed at fair value	(33,735)	(293,288)
Less: Below-market leases	(29,885)	(28,115)
Less: Other liabilities assumed	(1,169)	(3,478)
Net assets acquired	185,485	407,705
Shopping Center Acquired [Member] \| In-Place Leases (Including Lease Origination Costs and Fair Market Value of Leases) [Member]
Business Acquisition [Line Items]
Intangible assets acquired	$ 19,250	$ 59,684
Weighted Average Amortization Period	7 years 3 months 18 days	7 years 1 month 6 days
Shopping Center Acquired [Member] \| Tenant Relations [Member]
Business Acquisition [Line Items]
Intangible assets acquired	$ 9,176	$ 35,828
Weighted Average Amortization Period	10 years 10 months 24 days	7 years 8 months 12 days
Shopping Center Acquired [Member] \| Below-Market Leases [Member]
Business Acquisition [Line Items]
Weighted Average Amortization Period	18 years 4 months 24 days	19 years 1 month 6 days

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

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Business combination recognized identifiable assets acquired and liabilities assumed 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount after amortization of 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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472

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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 long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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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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