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Summary of Each Mortgage (Parenthetical) (Detail)	6 Months Ended
	Jun. 30, 2013
Belle Creek Apartments
Mortgage Loans on Real Estate [Line Items]
Floating rate	2.25%
30-day LIBOR rate	0.19%
Debt number of days of LIBOR against interest rate basis	30-day LIBOR
Centrepoint Apartments
Mortgage Loans on Real Estate [Line Items]
Interest payment period	Monthly
Principal date	Feb. 01, 2015
Amortization schedule	30-year amortization schedule
Copper Mill Apartments
Mortgage Loans on Real Estate [Line Items]
Interest payment period	Monthly
Principal date	May 01, 2013
Amortization schedule	30-year amortization schedule
Crestmont Apartments
Mortgage Loans on Real Estate [Line Items]
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]
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]
Interest payment period	Monthly
Principal date	May 01, 2013
Amortization schedule	30-year amortization schedule
Runaway Bay Apartments
Mortgage Loans on Real Estate [Line Items]
Interest payment period	Monthly
Principal date	Dec. 01, 2013
Amortization schedule	30-year amortization schedule
Tresa At Arrowhead
Mortgage Loans on Real Estate [Line Items]
Floating rate	2.25%
30-day LIBOR rate	0.19%
Debt number of days of LIBOR against interest rate basis	30-day LIBOR

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	ck0001466085_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Debt number of days of LIBOR against interest rate basis.

+ References

No definition available.

+ Details

Name:	ck0001466085_DebtNumberOfDaysOfLiborAgainstInterestRateBasis
Namespace Prefix:	ck0001466085_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Frequency of periodic payment for mortgage loans on real.

+ References

No definition available.

+ Details

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Namespace Prefix:	ck0001466085_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The 30-day LIBOR rate as of period end used for floating rate instruments.

+ References

No definition available.

+ Details

Name:	ck0001466085_LiborRate
Namespace Prefix:	ck0001466085_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Mortgage loans on real estate period of amortization schedule.

+ References

No definition available.

+ Details

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Namespace Prefix:	ck0001466085_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration