Property Held for Development

No definition available.

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- Definition

Percentage Of Ownership Interests

+ References

No definition available.

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- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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- Definition

Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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- Definition

The number of general partner units outstanding.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 5

-Subparagraph (SAB TOPIC 4.F)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 4

-Section F

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- Definition

Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 272

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

+ Details

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- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

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- Definition

The number of units in a real estate property owned as of the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

The amount of a reclassification adjustment made to prior period financial statement amounts.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Consolidation and Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) ft² in Thousands, $ in Millions	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2015 USD ($) ft² Property apartmentunits States Communities shares	Sep. 30, 2015 USD ($) ft² Property apartmentunits States Communities shares	Sep. 30, 2014 shares	Dec. 31, 2014 USD ($)
Real Estate Properties [Line Items]
General Partners' Capital Account, Units Outstanding \| shares	75,379,381	75,379,381	75,242,266
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest		94.70%	94.70%
Number of owned or owned interests of apartment communities	253	253
Number of apartments included in a community \| apartmentunits	79,024	79,024
Number of states in which apartment units are located \| States	15	15
Percentage Of Ownership Interests	100.00%	100.00%
Maximum [Member]
Real Estate Properties [Line Items]
Percentage Of Ownership Interests	100.00%	100.00%
Development Properties [Member]
Real Estate Properties [Line Items]
Number of owned or owned interests of apartment communities \| Communities	4	4
Number of apartments included in a community	232	232
Number of units under development community	806	806
Development Properties [Member] \| Expected Costs [Member]
Real Estate Properties [Line Items]
Development and capital improvements in progress \| $	$ 119.5	$ 119.5
Development Properties [Member] \| Costs Incurred to Date [Member]
Real Estate Properties [Line Items]
Development and capital improvements in progress \| $	$ 65.5	$ 65.5
Retail
Real Estate Properties [Line Items]
Number of owned or owned interests of apartment communities	5	5
Square Footage of Real Estate Property \| ft²	163	163
Commercial Real Estate [Member]
Real Estate Properties [Line Items]
Number of owned or owned interests of apartment communities	1	1
Square Footage of Real Estate Property \| ft²	196	196
Partially Owned Properties [Member]
Real Estate Properties [Line Items]
Number of owned or owned interests of apartment communities	1	1
Square Footage of Real Estate Property \| ft²	30	30
Building Repairs and Maintenance Expenses [Member]
Real Estate Properties [Line Items]
Prior Period Reclassification Adjustment \| $	$ 0.3	$ 1.0
Utilities Expenses [Member]
Real Estate Properties [Line Items]
Prior Period Reclassification Adjustment \| $	$ 8.6	25.4
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Real Estate Properties [Line Items]
Prior Period Reclassification Adjustment \| $		$ 34.1		$ 36.5