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Indebtedness - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  |  | 1 Months Ended |  | 1 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 27, 2013 Berkshire Square Apartments | Dec. 31, 2013 Berkshire Square Apartments | Dec. 31, 2013 Mortgages Debt | Dec. 31, 2012 Mortgages Debt | Dec. 31, 2013 Fixed Rate Mortgage Debt | Dec. 31, 2013 Sponsor | Dec. 31, 2012 Sponsor | Dec. 31, 2013 Third Parties | Dec. 31, 2012 Third Parties | Oct. 25, 2013 Secured revolving credit facility | Dec. 31, 2013 Secured revolving credit facility | Oct. 25, 2013 Secured revolving credit facility LIBOR
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate on mortgage indebtedness |  |  |  |  | 4.40% | [1] | 3.80% |  |  |  |  |  |  |  |  |
Debt | $ 103,303,000 |  |  |  |  |  |  |  |  | $ 38,100,000 | $ 38,200,000 | $ 65,200,000 | $ 54,300,000 |  |  |
Interest paid | 3,545,000 | 3,219,000 | 1,712,000 |  |  |  |  |  |  | 722,000 | 724,000 |  |  |  |  |
Revolving credit facility borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |
Debt instrument basis spread on LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.75%
Debt instrument, term |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |
Debt outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,500,000 |
Loan agreement amount |  |  |  | 8,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Repayments of secured credit facility |  |  |  | 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Loan fixed interest rate |  |  |  | 4.42% |  |  |  |  |  |  |  |  |  |  |  |
Loan maturity date |  |  |  | Jan. 01, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Loan amount due upon maturity |  |  |  | 7,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Federal Home Loan Mortgage Corporation's defined yield maintenance prepayment premium minimum percentage |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |
Loan non prepaid or defeased period |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |
Fair value of indebtedness |  |  |  |  |  |  | $ 101,272,000 | $ 95,827,000 | $ 63,324,000 |  |  |  |  |  |  |
[1] | 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.

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- 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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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: 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 Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 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 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: 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 fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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