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Summary of Information Concerning Indebtedness that Encumbered our Properties (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 0 Months Ended | 9 Months Ended |  | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2014 Belle Creek Apartments | Dec. 31, 2013 Belle Creek Apartments | Sep. 30, 2014 Tresa At Arrowhead | Dec. 31, 2013 Tresa At Arrowhead | Sep. 30, 2014 Centrepoint Apartments | Dec. 31, 2013 Centrepoint Apartments | Sep. 30, 2014 Berkshire Square Apartments | Dec. 31, 2013 Berkshire Square Apartments | Sep. 30, 2014 Copper Mill Apartments | Dec. 31, 2013 Copper Mill Apartments | Sep. 30, 2014 Crestmont Apartments | Dec. 31, 2013 Crestmont Apartments | Sep. 30, 2014 Cumberland Glen Apartments | Dec. 31, 2013 Cumberland Glen Apartments | Sep. 30, 2014 Heritage Trace Apartments | Dec. 31, 2013 Heritage Trace Apartments | Sep. 30, 2014 Runaway Bay Apartments | Dec. 31, 2013 Runaway Bay Apartments | Feb. 07, 2014 Reserve at Eagle Ridge | Sep. 30, 2014 Reserve at Eagle Ridge | Feb. 07, 2014 Reserve at Eagle Ridge | Feb. 28, 2014 OKC Portfolio | Sep. 30, 2014 OKC Portfolio | Mar. 31, 2014 King's Landing | Sep. 30, 2014 King's Landing | Sep. 30, 2014 Crossings | May 27, 2014 Crossings | Sep. 30, 2014 Carrington | Jul. 15, 2014 Carrington | Sep. 30, 2014 Arbors at the Reservoir | Jul. 15, 2014 Arbors at the Reservoir | Sep. 30, 2014 Walnut Hill | Sep. 15, 2014 Walnut Hill | Sep. 30, 2014 Mortgages Debt | Dec. 31, 2013 Mortgages Debt | Sep. 30, 2014 Secured Credit Facility | Dec. 31, 2013 Secured Credit Facility
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Principal |  |  | $ 10,575 |  | $ 10,575 |  | $ 27,500 |  | $ 27,500 |  | $ 17,600 |  | $ 17,600 |  | $ 8,612 |  | $ 8,612 |  | $ 7,223 | $ 7,293 | $ 6,633 | $ 6,698 | $ 6,781 | $ 6,846 | $ 5,405 | $ 5,457 | $ 10,081 | $ 10,222 |  | $ 18,850 |  |  | $ 45,189 |  |  | $ 21,200 |  | $ 15,313 |  | $ 14,235 |  | $ 13,150 |  | $ 18,650 |  | $ 246,997 | $ 100,803 |  |  |  |
Carrying Amount |  |  | 10,575 |  | 10,575 |  | 27,500 |  | 27,500 |  | 17,600 |  | 17,600 |  | 8,612 |  | 8,612 |  | 7,223 | 7,293 | 6,633 | 6,698 | 6,781 | 6,846 | 5,405 | 5,457 | 10,081 | 10,222 |  | 18,850 |  |  | 47,025 |  |  | 21,200 |  | 15,313 |  | 14,235 |  | 13,150 |  | 18,650 |  | 248,833 | 100,803 |  |  |  |
Effective Interest Rate |  |  | 2.40% | [1] | 2.40% | [2] | 2.40% | [1] | 2.40% | [2] | 3.70% | [3] | 3.70% | [3] | 4.40% | [4] | 4.40% | [4] | 5.70% | 5.70% | 5.70% | 5.70% | 5.70% | 5.70% | 5.70% | 5.70% | 3.60% | 3.60% |  | 4.70% |  | 5.60% | 2.80% | [5] | 4.00% | 4.00% | [6] | 3.90% |  | 4.00% |  | 4.00% |  | 3.40% |  | 3.70% | 3.80% |  |  |  |
Maturity Date |  |  | Apr. 28, 2021 |  | Apr. 28, 2021 |  | Apr. 28, 2021 |  | Apr. 28, 2021 |  | Jan. 01, 2019 |  | Jan. 01, 2019 |  | Jan. 01, 2021 |  | Jan. 01, 2021 |  | May 01, 2021 | May 01, 2021 | May 01, 2021 | May 01, 2021 | May 01, 2021 | May 01, 2021 | May 01, 2021 | May 01, 2021 | Nov. 01, 2022 | Nov. 01, 2022 |  | Mar. 01, 2024 |  | Apr. 01, 2016 | Apr. 01, 2016 |  | Jun. 01, 2021 | Jun. 01, 2021 |  | Jun. 01, 2024 |  | Aug. 01, 2024 |  | Aug. 01, 2024 |  | Oct. 01, 2021 |  |  |  |  |  |  |
Outstanding Principal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000 |  | 2,500 |
Effective Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.70% | [7] | 2.90% | [8]
Maturity Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Oct. 25, 2016 |  | Oct. 25, 2016 |
Outstanding Principal | 251,997 | 103,303 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Amount | $ 253,833 | $ 103,303 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,850 |  |  |  |  |  |  |  | $ 15,313 |  | $ 14,235 |  | $ 13,150 |  | $ 18,650 |  |  |  |  |  |
Effective Interest Rate | 3.70% | 3.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Floating rate at 225 basis points over 30-day LIBOR. As of September 30, 2014, 30-day LIBOR was 0.15%. Interest only payments are due monthly. These mortgages are held by RAIT.
[2] | Floating rate at 225 basis points over 30-day LIBOR. As of December 31, 2013, 30-day LIBOR was 0.17%. Interest only payments are due monthly. These mortgages are held by RAIT.
[3] | 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.
[4] | Fixed Rate. Interest only payments are due monthly. Beginning February 1, 2016, principal and interest payments are required based on a 30-year amortization schedule.
[5] | Contractual interest rate is 5.6%. The debt was assumed and recorded at a premium that will be amortized to interest expense over the remaining term. Principal and interest payments are required based on a 30-year amortization schedule.
[6] | Fixed Rate. Interest only payments are due monthly. Beginning June 1, 2017, principal and interest payments are required based on a 30-year amortization schedule.
[7] | Floating rate at 250 basis points over 30-day LIBOR. As of September 30, 2014, 30-day LIBOR was 0.15%. Interest only payments are due monthly. As of September 30, 2014, we were in compliance with all financial covenants contained in the credit facility.
[8] | Floating rate at 275 basis points over 30-day LIBOR. As of December 31, 2013, 30-day LIBOR was 0.17%. Interest only payments are due monthly. As of June 30, 2014, we were in compliance with all financial covenants contained in the credit facility.

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- Definition The average effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The effective interest rate during the reporting period. + 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
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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 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: 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 Reference 4: 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 + Details
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- Definition The carrying amount of the outstanding balance due under the mortgage loan. + References Reference 1: 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=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: 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 Reference 4: 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 + Details
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- Definition Amount of the contractual principal due at the origination of the mortgage loan (face amount). + References Reference 1: 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=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: 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 Reference 4: 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 + Details
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- Definition The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans. + References Reference 1: 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=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: 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 Reference 4: 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 + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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