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Summary of Information Concerning Indebtedness that Encumbered our Properties (Detail) - USD ($) $ in Thousands |  |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 13, 2015 | Jan. 27, 2015 | Jun. 30, 2015 | Dec. 31, 2014
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness, outstanding principal |  |  |  | $ 456,283 |  | $ 398,977 |
Mortgage indebtedness, carrying amount |  |  |  | 457,202 |  | 400,509 |
Indebtedness, outstanding principal |  |  |  | 456,283 |  | 417,369 |
Indebtedness, carrying amount |  |  |  | $ 457,202 |  | $ 418,901 |
Weighted Average |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness, effective interest rate |  |  |  | 3.60% |  | 3.60% |
Indebtedness, effective interest rate |  |  |  | 3.60% |  | 3.60% |
Centrepoint Apartments |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness, outstanding principal |  |  |  | $ 17,441 |  | $ 17,600 |
Mortgage indebtedness, carrying amount |  |  |  | $ 17,441 |  | $ 17,600 |
Mortgage indebtedness, effective interest rate | [1] |  |  | 3.70% |  | 3.70% |
Mortgage indebtedness, maturity date |  |  |  | Jan. 01, 2019 |  | Jan. 01, 2019 |
Berkshire Square Apartments |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness, outstanding principal |  |  |  | $ 8,612 |  | $ 8,612 |
Mortgage indebtedness, carrying amount |  |  |  | $ 8,612 |  | $ 8,612 |
Mortgage indebtedness, effective interest rate | [2] |  |  | 4.40% |  | 4.40% |
Mortgage indebtedness, maturity date |  |  |  | Jan. 01, 2021 |  | Jan. 01, 2021 |
OKC Portfolio |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness, outstanding principal |  |  |  | $ 44,408 |  | $ 44,939 |
Mortgage indebtedness, carrying amount |  |  |  | $ 45,327 |  | $ 46,471 |
Mortgage indebtedness, effective interest rate | [3] |  |  | 2.80% |  | 2.80% |
Mortgage indebtedness, maturity date |  |  |  | Apr. 01, 2016 |  | Apr. 01, 2016 |
King's Landing |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness, outstanding principal |  |  |  | $ 21,200 |  | $ 21,200 |
Mortgage indebtedness, carrying amount |  |  |  | $ 21,200 |  | $ 21,200 |
Mortgage indebtedness, effective interest rate | [4] |  |  | 4.00% |  | 4.00% |
Mortgage indebtedness, maturity date |  |  |  | Jun. 01, 2022 |  | Jun. 01, 2022 |
Belle Creek Apartments |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness, outstanding principal |  |  |  | $ 10,575 |  | $ 10,575 |
Mortgage indebtedness, carrying amount |  |  |  | $ 10,575 |  | $ 10,575 |
Mortgage indebtedness, effective interest rate |  |  |  | 2.40% | [5] | 2.40% | [6]
Mortgage indebtedness, maturity date |  |  |  | Apr. 28, 2021 |  | Apr. 28, 2021 |
Tresa At Arrowhead |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness, outstanding principal |  |  |  | $ 27,500 |  | $ 27,500 |
Mortgage indebtedness, carrying amount |  |  |  | $ 27,500 |  | $ 27,500 |
Mortgage indebtedness, effective interest rate |  |  |  | 2.40% | [5] | 2.40% | [6]
Mortgage indebtedness, maturity date |  |  |  | Apr. 28, 2021 |  | Apr. 28, 2021 |
Copper Mill Apartments |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness, outstanding principal |  |  |  | $ 7,150 |  | $ 7,200 |
Mortgage indebtedness, carrying amount |  |  |  | $ 7,150 |  | $ 7,200 |
Mortgage indebtedness, effective interest rate |  |  |  | 5.70% |  | 5.70% |
Mortgage indebtedness, maturity date |  |  |  | May 01, 2021 |  | May 01, 2021 |
Crestmont Apartments |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness, outstanding principal |  |  |  | $ 6,566 |  | $ 6,612 |
Mortgage indebtedness, carrying amount |  |  |  | $ 6,566 |  | $ 6,612 |
Mortgage indebtedness, effective interest rate |  |  |  | 5.70% |  | 5.70% |
Mortgage indebtedness, maturity date |  |  |  | May 01, 2021 |  | May 01, 2021 |
Cumberland Glen Apartments |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness, outstanding principal |  |  |  | $ 6,712 |  | $ 6,759 |
Mortgage indebtedness, carrying amount |  |  |  | $ 6,712 |  | $ 6,759 |
Mortgage indebtedness, effective interest rate |  |  |  | 5.70% |  | 5.70% |
Mortgage indebtedness, maturity date |  |  |  | May 01, 2021 |  | May 01, 2021 |
Heritage Trace Apartments |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness, outstanding principal |  |  |  | $ 5,350 |  | $ 5,388 |
Mortgage indebtedness, carrying amount |  |  |  | $ 5,350 |  | $ 5,388 |
Mortgage indebtedness, effective interest rate |  |  |  | 5.70% |  | 5.70% |
Mortgage indebtedness, maturity date |  |  |  | May 01, 2021 |  | May 01, 2021 |
Runaway Bay Apartments |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness, outstanding principal |  |  |  | $ 9,935 |  | $ 10,033 |
Mortgage indebtedness, carrying amount |  |  |  | $ 9,935 |  | $ 10,033 |
Mortgage indebtedness, effective interest rate |  |  |  | 3.60% |  | 3.60% |
Mortgage indebtedness, maturity date |  |  |  | Nov. 01, 2022 |  | Nov. 01, 2022 |
Reserve at Eagle Ridge |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness, outstanding principal |  |  |  | $ 18,850 |  | $ 18,850 |
Mortgage indebtedness, carrying amount |  |  |  | $ 18,850 |  | $ 18,850 |
Mortgage indebtedness, effective interest rate |  |  |  | 4.70% |  | 4.70% |
Mortgage indebtedness, maturity date |  |  |  | Mar. 01, 2024 |  | Mar. 01, 2024 |
Crossings |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness, outstanding principal |  |  |  | $ 15,313 |  | $ 15,313 |
Mortgage indebtedness, carrying amount |  |  |  | $ 15,313 |  | $ 15,313 |
Mortgage indebtedness, effective interest rate |  |  |  | 3.90% |  | 3.90% |
Mortgage indebtedness, maturity date |  |  |  | Jun. 01, 2024 |  | Jun. 01, 2024 |
Carrington Park |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness, outstanding principal |  |  |  | $ 14,235 |  | $ 14,235 |
Mortgage indebtedness, carrying amount |  |  |  | $ 14,235 |  | $ 14,235 |
Mortgage indebtedness, effective interest rate |  |  |  | 4.00% |  | 4.00% |
Mortgage indebtedness, maturity date |  |  |  | Aug. 01, 2024 |  | Aug. 01, 2024 |
Arbors at the Reservoir |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness, outstanding principal |  |  |  | $ 13,150 |  | $ 13,150 |
Mortgage indebtedness, carrying amount |  |  |  | $ 13,150 |  | $ 13,150 |
Mortgage indebtedness, effective interest rate |  |  |  | 4.00% |  | 4.00% |
Mortgage indebtedness, maturity date |  |  |  | Aug. 01, 2024 |  | Aug. 01, 2024 |
Walnut Hill |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness, outstanding principal |  |  |  | $ 18,650 |  | $ 18,650 |
Mortgage indebtedness, carrying amount |  |  |  | $ 18,650 |  | $ 18,650 |
Mortgage indebtedness, effective interest rate |  |  |  | 3.40% |  | 3.40% |
Mortgage indebtedness, maturity date |  |  |  | Oct. 01, 2021 |  | Oct. 01, 2021 |
Lenoxplace |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness, outstanding principal |  |  |  | $ 15,991 |  | $ 15,991 |
Mortgage indebtedness, carrying amount |  |  |  | $ 15,991 |  | $ 15,991 |
Mortgage indebtedness, effective interest rate |  |  |  | 3.70% |  | 3.70% |
Mortgage indebtedness, maturity date |  |  |  | Nov. 01, 2021 |  | Nov. 01, 2021 |
Bennington Pond |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness, outstanding principal |  |  |  | $ 11,375 |  | $ 11,375 |
Mortgage indebtedness, carrying amount |  |  |  | $ 11,375 |  | $ 11,375 |
Mortgage indebtedness, effective interest rate |  |  |  | 3.70% |  | 3.70% |
Mortgage indebtedness, maturity date |  |  |  | Dec. 01, 2024 |  | Dec. 01, 2024 |
Stonebridge Crossing |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness, outstanding principal |  |  |  | $ 19,370 |  | $ 19,370 |
Mortgage indebtedness, carrying amount |  |  |  | $ 19,370 |  | $ 19,370 |
Mortgage indebtedness, effective interest rate |  |  |  | 3.40% |  | 3.40% |
Mortgage indebtedness, maturity date |  |  |  | Jan. 01, 2022 |  | Jan. 01, 2022 |
Prospect Park |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness, outstanding principal |  |  |  | $ 9,230 |  | $ 9,230 |
Mortgage indebtedness, carrying amount |  |  |  | $ 9,230 |  | $ 9,230 |
Mortgage indebtedness, effective interest rate |  |  |  | 3.60% |  | 3.60% |
Mortgage indebtedness, maturity date |  |  |  | Jan. 01, 2025 |  | Jan. 01, 2025 |
Brookside |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness, outstanding principal |  |  |  | $ 13,455 |  | $ 13,455 |
Mortgage indebtedness, carrying amount |  |  |  | $ 13,455 |  | $ 13,455 |
Mortgage indebtedness, effective interest rate |  |  |  | 3.60% |  | 3.60% |
Mortgage indebtedness, maturity date |  |  |  | Jan. 01, 2025 |  | Jan. 01, 2025 |
Jamestown |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness, outstanding principal |  |  |  | $ 22,880 |  | $ 22,880 |
Mortgage indebtedness, carrying amount |  |  |  | $ 22,880 |  | $ 22,880 |
Mortgage indebtedness, effective interest rate |  |  |  | 3.60% |  | 3.60% |
Mortgage indebtedness, maturity date |  |  |  | Jan. 01, 2025 |  | Jan. 01, 2025 |
Meadows |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness, outstanding principal |  |  |  | $ 24,245 |  | $ 24,245 |
Mortgage indebtedness, carrying amount |  |  |  | $ 24,245 |  | $ 24,245 |
Mortgage indebtedness, effective interest rate |  |  |  | 3.60% |  | 3.60% |
Mortgage indebtedness, maturity date |  |  |  | Jan. 01, 2025 |  | Jan. 01, 2025 |
Oxmoor |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness, outstanding principal |  |  |  | $ 35,815 |  | $ 35,815 |
Mortgage indebtedness, carrying amount |  |  |  | $ 35,815 |  | $ 35,815 |
Mortgage indebtedness, effective interest rate |  |  |  | 3.60% |  | 3.60% |
Mortgage indebtedness, maturity date |  |  |  | Jan. 01, 2025 |  | Jan. 01, 2025 |
Iron Rock Ranch |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness, outstanding principal |  |  |  | $ 22,900 |  |  |
Mortgage indebtedness, carrying amount |  |  | $ 22,900 | $ 22,900 |  |  |
Mortgage indebtedness, effective interest rate |  |  | 3.40% | 3.40% |  |  |
Mortgage indebtedness, maturity date |  |  | Feb. 01, 2025 | Feb. 01, 2025 |  |  |
Stonebridge At The Ranch |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness, outstanding principal |  |  |  | $ 20,527 |  |  |
Mortgage indebtedness, carrying amount |  | $ 20,527 |  | $ 20,527 |  |  |
Mortgage indebtedness, effective interest rate |  | 3.20% |  | 3.20% |  |  |
Mortgage indebtedness, maturity date |  | May 01, 2025 |  | May 01, 2025 |  |  |
Total mortgage debt/Weighted- Average |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness, outstanding principal |  |  |  | $ 441,435 |  |  |
Mortgage indebtedness, carrying amount |  |  |  | $ 442,354 |  |  |
Mortgage indebtedness, effective interest rate |  |  |  | 3.60% |  |  |
Secured Credit Facility |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Secured credit facility, outstanding principal |  |  |  | $ 14,848 |  | $ 18,392 |
Secured credit facility, carrying amount |  |  |  | $ 14,848 |  | $ 18,392 |
Secured credit facility, effective interest rate |  |  |  | 2.70% | [7] | 2.70% | [8]
Secured credit facility, maturity date |  |  |  | Oct. 25, 2016 |  | Oct. 25, 2016 |
[1] | 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.
[2] | 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.
[3] | 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.
[4] | 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.
[5] | Floating rate at 225 basis points over the 30-day London Interbank Offered Rate, or LIBOR. As of June 30, 2015, 30-day LIBOR was 0.19%. Interest only payments are due monthly. These mortgages are held by RAIT.
[6] | Floating rate at 225 basis points over 30-day LIBOR. As of December 31, 2014, 30-day LIBOR was 0.17%. Interest only payments are due monthly. These mortgages are held by RAIT.
[7] | Floating rate at 250 basis points over 30-day LIBOR. As of June 30, 2015 30-day LIBOR was 0.19%. Interest only payments are due monthly. As of June 30, 2015 we were in compliance with all financial covenants contained in the secured credit facility.
[8] | Floating rate at 250 basis points over 30-day LIBOR. As of December 31, 2014, 30-day LIBOR was 0.17%. Interest only payments are due monthly.

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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 + 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 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 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 + 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 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 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 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=27047687&loc=d3e5864-122674 + 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 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=27047687&loc=d3e5864-122674 + Details
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