The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.14(d))

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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- Definition

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

+ References

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- Definition

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

+ References

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- Definition

The cash inflow from the sale of formerly productive land held for sale, anything permanently fixed to it, including buildings, structures on it, and so forth.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585

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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.

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Real Estate Activity (Dispositions) - Additional Information (Detail) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	May. 31, 2014 USD ($)	Jun. 30, 2015 USD ($) Apartment Property	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) Apartment Property	Jun. 30, 2014 USD ($)	Mar. 31, 2014 Apartment
Real Estate Properties [Line Items]
Number of real estate properties \| Property		59		59
Number of units in real estate property		23,365		23,365
Gains on sales of real estate assets, net \| $		$ (298)	$ 36,092	$ 1,475	$ 36,902
Apartment Communities Sold [Member] \| New York [Member]
Real Estate Properties [Line Items]
Number of real estate properties						2
Number of units in real estate property						337
Apartment Communities Sold [Member] \| Houston, Texas [Member]
Real Estate Properties [Line Items]
Number of real estate properties						1
Number of units in real estate property						308
Apartment community sold approximately for gross proceeds \| $	$ 71,750
Gains on sales of real estate assets, net \| $	$ 36,092			(298)
For-Sale Condominium Homes [Member] \| Austin Condominium Project [Member]
Real Estate Properties [Line Items]
Gains on sales of real estate assets, net \| $				$ 1,773
For-Sale Condominium Homes [Member] \| Atlanta Condominium Project [Member]
Real Estate Properties [Line Items]
Gains on sales of real estate assets, net \| $					$ 810
Assets Held-for-Sale [Member]
Real Estate Properties [Line Items]
Number of units in real estate property						645
Assets Held-for-Sale [Member] \| Apartment Communities Sold [Member]
Real Estate Properties [Line Items]
Number of real estate properties						3