Acquisitions - Schedule of Acquisition Cost of Shopping Centers (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Less: Below-market leases	$ (127,513)	$ (147,941)
Shopping Center Acquired [Member]
Business Acquisition [Line Items]
Land	23,588	27,093
Buildings	35,659	99,034
Tenant improvements	8,565	4,385
Other assets	419	146
Assets acquired	82,216	153,489
Less: Below-market leases	(1,872)	(6,967)
Less: Other liabilities assumed	(581)	(547)
Net assets acquired	79,763	145,975
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	$ 7,051	$ 14,021
Weighted Average Amortization Period	16 years	5 years 1 month 6 days
Shopping Center Acquired [Member] \| Tenant Relationships [Member]
Business Acquisition [Line Items]
Intangible assets acquired	$ 6,934	$ 8,810
Weighted Average Amortization Period	16 years 3 months 19 days	11 years 1 month 6 days
Shopping Center Acquired [Member] \| Below-Market Leases [Member]
Business Acquisition [Line Items]
Weighted Average Amortization Period	20 years	15 years 4 months 24 days

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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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-Publisher FASB
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
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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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