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Summary of Each Mortgage (Parenthetical) (Detail) | 6 Months Ended
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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
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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
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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
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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