Summary of Each Mortgage (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]
Outstanding Principal	$ 92,413
Current Interest Rate	3.80%
Crestmont Apartments
Mortgage Loans on Real Estate [Line Items]
Outstanding Principal	6,750
Current Interest Rate	5.70%
Maturity Date	May 01, 2021
Interest Terms	Fixed rate. Interest only payments are due monthly. Beginning May 1, 2013, principal and interest payments are required based on a 30-year amortization schedule
Interest payment period	Monthly
Principal date	May 01, 2013
Amortization schedule	30-year amortization schedule
Cumberland Glen Apartments
Mortgage Loans on Real Estate [Line Items]
Outstanding Principal	6,900
Current Interest Rate	5.70%
Maturity Date	May 01, 2021
Interest Terms	Fixed rate. Interest only payments are due monthly. Beginning May 1, 2013, principal and interest payments are required based on a 30-year amortization schedule
Interest payment period	Monthly
Principal date	May 01, 2013
Amortization schedule	30-year amortization schedule
Copper Mill Apartments
Mortgage Loans on Real Estate [Line Items]
Outstanding Principal	7,350
Current Interest Rate	5.70%
Maturity Date	May 01, 2021
Interest Terms	Fixed rate. Interest only payments are due monthly. Beginning May 1, 2013, principal and interest payments are required based on a 30-year amortization schedule
Interest payment period	Monthly
Principal date	May 01, 2013
Amortization schedule	30-year amortization schedule
Heritage Trace Apartments
Mortgage Loans on Real Estate [Line Items]
Outstanding Principal	5,500
Current Interest Rate	5.70%
Maturity Date	May 01, 2021
Interest Terms	Fixed rate. Interest only payments are due monthly. Beginning May 1, 2013, principal and interest payments are required based on a 30-year amortization schedule
Interest payment period	Monthly
Principal date	May 01, 2013
Amortization schedule	30-year amortization schedule
Belle Creek Apartments
Mortgage Loans on Real Estate [Line Items]
Outstanding Principal	10,575
Current Interest Rate	2.50%
Maturity Date	Apr. 28, 2021
Interest Terms	Fixed rate of interest at 2.5% for the first two years with a floating rate thereafter at 225 basis points over 30-day LIBOR. Interest only
Fixed rate of interest	2.50%
Debt Instrument Basis Spread On Variable Rate	2.25%
Debt number of days of LIBOR against interest rate basis	30-day LIBOR
Tresa At Arrowhead
Mortgage Loans on Real Estate [Line Items]
Outstanding Principal	27,500
Current Interest Rate	2.50%
Maturity Date	Apr. 28, 2021
Interest Terms	Fixed rate of interest at 2.5% for the first two years with a floating rate thereafter at 225 basis points over 30-day LIBOR. Interest only
Fixed rate of interest	2.50%
Debt Instrument Basis Spread On Variable Rate	2.25%
Debt number of days of LIBOR against interest rate basis	30-day LIBOR
Runaway Bay Apartments
Mortgage Loans on Real Estate [Line Items]
Outstanding Principal	10,238
Current Interest Rate	3.60%
Maturity Date	Nov. 01, 2022
Interest Terms	Fixed Rate. Interest only payments are due monthly. Beginning December 1, 2013, principal and interest payments are required based on a 30-year amortization schedule
Interest payment period	Monthly
Principal date	Dec. 01, 2013
Amortization schedule	30-year amortization schdule
Centrepoint Apartments
Mortgage Loans on Real Estate [Line Items]
Outstanding Principal	$ 17,600
Current Interest Rate	3.70%
Maturity Date	Jan. 01, 2019
Interest Terms	Fixed rate. Interest only payments are due monthly. Beginning February 1, 2015, principal and interest payments are required based on a 30-year amortization schedule
Interest payment period	Monthly
Principal date	Feb. 01, 2015
Amortization schedule	30-year amortization schedule

Date the debt agreement requires a change in payment type from interest only to principal and interest.

No definition available.

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt number of days of LIBOR against interest rate basis.

+ References

No definition available.

+ Details

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- Definition

Debt weighted average interest rate for the first two years.

+ References

No definition available.

+ Details

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- Definition

Frequency of periodic payment for mortgage loans on real.

+ References

No definition available.

+ Details

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- Definition

Mortgage loans on real estate period of amortization schedule.

+ References

No definition available.

+ Details

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- Definition

The percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Stated maturity date of the mortgage loan receivable on real estate, in CCYY-MM-DD format.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 948

-SubTopic 310

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-29)

-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule IV)

-URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 29

-Article 12

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule IV

-Article 5

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- Definition

The carrying amount of the outstanding balance due under the mortgage loan.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans.

+ References

+ Details

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