Notes Payable (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2013
Debt Instrument [Line Items]
Revolving credit facility	$ 75
Credit facility term	3 years
Line of credit facility increasing availability	75.0
Credit facility maximum capacity under accordion feature	150.0
Period of replacement for executive management team member	90 days
Threshold of other defaulted indebtedness that causes default of the credit facility	1.0
Available under facility	$ 57.9
Weighted average interest rate	4.70%
Weighted average remaining life	4 years 1 month 6 days
Minimum [Member]
Debt Instrument [Line Items]
LIBOR margin	2.05%
Maximum [Member]
Debt Instrument [Line Items]
LIBOR margin	2.75%
Maximum debt service coverage ratio	1.50

Line of credit facility increasing availability

No definition available.

Name:	reit_LineOfCreditFacilityIncreasingAvailability
Namespace Prefix:	reit_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line Of Credit Facility Maximum Borrowing Capacity Under Accordion Feature

+ References

No definition available.

+ Details

Name:	reit_LineOfCreditFacilityMaximumBorrowingCapacityUnderAccordionFeature
Namespace Prefix:	reit_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line Of Credit Facility Maximum Debt Service Coverage Ratio

+ References

No definition available.

+ Details

Name:	reit_LineOfCreditFacilityMaximumDebtServiceCoverageRatio
Namespace Prefix:	reit_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Line Of Credit Facility Term

+ References

No definition available.

+ Details

Name:	reit_LineOfCreditFacilityTerm
Namespace Prefix:	reit_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Long-term debt, weighted average remaining life.

+ References

No definition available.

+ Details

Name:	reit_LongTermDebtWeightedAverageRemainingLife
Namespace Prefix:	reit_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Period For Replacement Of Member Of Executive Management Team

+ References

No definition available.

+ Details

Name:	reit_PeriodForReplacementOfMemberOfExecutiveManagementTeam
Namespace Prefix:	reit_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Threshold Of Other Defaulted Indebtedness That Causes Default Of Credit Facility

+ References

No definition available.

+ Details

Name:	reit_ThresholdOfOtherDefaultedIndebtednessThatCausesDefaultOfCreditFacility
Namespace Prefix:	reit_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: 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.

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 210.5-02.19(b),22(b))

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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of long-term debt outstanding by type or by instrument at that time.

+ References

No definition available.

+ Details

Name:	us-gaap_LongtermDebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant