Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Contingencies And Commitments [Line Items]
Agreements entered into with general contractors for the construction or redevelopment of shopping centers	$ 52.2
Outstanding letters of credit	31.3
Affiliate debt guarantee	$ 4.9
Long-term ground leases expiration period	various dates through 2070
Period space in shopping centers leased	One month to 30 years
Coventry II Joint Ventures [Member]
Contingencies And Commitments [Line Items]
Number of existing retail properties	10

Agreements entered into with general contractors for the construction or redevelopment of shopping centers.

No definition available.

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- Details

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- Definition

Long term ground leases expiration period.

+ References

No definition available.

+ Details

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- Definition

Existing or proposed retail properties that were acquired through various unconsolidated joint ventures.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Period space in shopping centers leased.

+ References

No definition available.

+ Details

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- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (b)(1)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Details

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