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Mortgage Indebtedness - Additional Information (Detail) - USD ($) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
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Jun. 24, 2016 | May 26, 2016 | May 20, 2016 | May 17, 2016 | Sep. 17, 2015 | May 31, 2016 | Apr. 30, 2016 | Mar. 31, 2016 | Feb. 29, 2016 | Jan. 31, 2016 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness, weighted average interest rate |  |  |  |  |  |  |  |  |  |  | 3.60% |  |  | 3.60% |  |  | 3.70% |
Debt outstanding Principal |  |  |  |  |  |  |  |  |  |  | $ 888,382,000 |  |  | $ 888,382,000 |  |  | $ 975,531,000 |
Cash paid for interest |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,894,000 |  | $ 8,615,000 |  |
Secured credit facility borrowing capacity |  |  |  |  |  |  |  |  |  |  | 325,000,000 |  |  | 325,000,000 |  |  | 325,000,000 |
Debt instrument repayment |  |  |  |  |  |  |  |  |  |  |  |  |  | 241,895,000 |  | 19,362,000 |  |
Principal amount outstanding |  |  |  |  |  |  |  |  |  |  | $ 247,335,000 |  |  | $ 247,335,000 |  |  | $ 271,500,000 |
Key Bank Senior Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments Of Lines Of Credit |  |  |  |  |  | $ 77,665,000 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from credit facility |  |  |  |  |  |  |  | $ 45,476,000 |  |  |  |  |  |  |  |  |  |
Key Bank Interim Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Drew Down |  |  |  |  |  |  |  | 8,000,000 |  |  |  |  |  |  |  |  |  |
Repayments Of Lines Of Credit |  |  |  |  |  | 30,000,000 | $ 30,000,000 | 6,000,000 | $ 23,784,000 | $ 23,784,000 |  |  |  |  |  |  |  |
Secured Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness, weighted average interest rate |  |  |  |  |  |  |  |  |  |  | 2.90% | [1],[2] |  | 2.90% | [1],[2] |  | 2.90% | [3]
Debt outstanding Principal |  |  |  |  |  |  |  |  |  |  | $ 247,335,000 | [1],[2] |  | $ 247,335,000 | [1],[2] |  | $ 271,500,000 | [3]
Secured Credit Facility | Key Bank Senior Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured credit facility borrowing capacity |  |  |  |  | $ 325,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Secured credit facility, remaining borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 77,665,000 |  |  | $ 77,665,000 |  |  |  |
Debt instrument, interest rate, effective percentage |  |  |  |  |  |  |  |  |  |  | 0.25% |  |  | 0.25% |  |  |  |
Secured Credit Facility | Key Bank Senior Facility | Limited Partner |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured credit facility, maturity date |  |  |  |  | Sep. 17, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in maximum borrowing capacity |  |  |  |  | $ 450,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Credit Facility | 1-month LIBOR | Key Bank Senior Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.45% |  |  |  |
Senior Interim Term Loan | Key Bank Interim Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured credit facility borrowing capacity |  |  |  |  | $ 120,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Secured credit facility, maturity date |  |  |  |  | Sep. 16, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured credit facility, amended amount | $ 40,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Term Loan Facility | Key Bank Interim Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured credit facility borrowing capacity | $ 40,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured credit facility, maturity date | Sep. 17, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from credit facility | $ 40,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest payment period |  |  |  |  |  |  |  |  |  |  |  |  |  | Monthly |  |  |  |
Principal date | Jun. 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of net proceeds from equity issuances, sales of assets, refinancing of assets | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Periodic principal payment monthly | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument closing costs | 416,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument repayment | $ 33,512,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount outstanding |  |  |  |  |  |  |  |  |  |  | $ 40,000,000 |  |  | $ 40,000,000 |  |  |  |
Senior Term Loan Facility | 1-month LIBOR | Key Bank Interim Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate | 4.00% |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |  |
Senior Term Loan Facility | Base Rate | Key Bank Interim Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sponsor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for interest |  |  |  |  |  |  |  |  |  |  | $ 96,000 |  | $ 241,000 | $ 361,000 |  | $ 479,000 |  |
Mortgages-Fixed Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness, weighted average interest rate |  |  |  |  |  |  |  |  |  |  | 3.80% |  |  | 3.80% |  |  | 3.80% |
Debt outstanding Principal |  |  |  |  |  |  |  |  |  |  | $ 601,047,000 |  |  | $ 601,047,000 |  |  | $ 545,956,000 |
Repayments Of Lines Of Credit |  |  |  |  |  |  |  | $ 43,694,000 |  |  |  |  |  |  |  |  |  |
Repayment of mortgage indebtedness as part of a property disposition |  |  |  |  |  |  |  |  | $ 6,659,000 |  |  |  |  |  |  |  |  |
Mortgages-Fixed Rate | Aston |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt outstanding Principal |  | $ 25,050,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness maturity (in years) |  | 30 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest payment period |  |  |  |  |  |  |  |  |  |  |  |  |  | Monthly |  |  |  |
Principal date |  | Dec. 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  | 3.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  | Jun. 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgages-Fixed Rate | Craig Ranch |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt outstanding Principal |  |  |  | $ 31,250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness maturity (in years) |  |  |  | 30 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest payment period |  |  |  |  |  |  |  |  |  |  |  |  |  | Monthly |  |  |  |
Principal date |  |  |  | May 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  | 3.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  | Jun. 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgages-Fixed Rate | Big Creek |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt outstanding Principal |  |  | $ 49,680,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness maturity (in years) |  |  | 30 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest payment period |  |  |  |  |  |  |  |  |  |  |  |  |  | Monthly |  |  |  |
Principal date |  |  | Jun. 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  | 3.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  | Jun. 30, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgages-Fixed Rate | Key Bank Interim Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments Of Lines Of Credit |  |  |  |  |  | $ 26,704,000 |  |  |  |  |  |  |  |  |  |  |  |
Mortgages-Fixed Rate | Key Bank Interim Facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness maturity (in years) |  |  |  |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |  |
Mortgages-Fixed Rate | Key Bank Interim Facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness maturity (in years) |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |
Mortgages-Floating Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness, weighted average interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.80% |
Debt outstanding Principal |  |  |  |  |  |  |  |  |  |  | 0 |  |  | $ 0 |  |  | $ 38,075,000 |
Repayment of mortgage indebtedness as part of a property disposition |  |  |  |  |  | $ 27,500,000 | $ 10,575,000 |  |  |  |  |  |  |  |  |  |  |
Mortgages-Floating Rate | Mortgages-Floating Rate April 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exit fees pursuant to mortgage indebtedness |  |  |  |  |  |  |  |  |  |  | 211,000 |  |  | 211,000 |  |  |  |
Mortgages-Floating Rate | Mortgages-Floating Rate May 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exit fees pursuant to mortgage indebtedness |  |  |  |  |  |  |  |  |  |  | $ 275,000 |  |  | $ 275,000 |  |  |  |
[1] | As of June 30, 2016, IRT maintained a float-to-fixed interest rate swap with a $ 150,000 notional amount. This swap, which expires on June 17, 2021 and has a fixed rate of 1.145%, has converted $ 150,000 of our floating rate debt to fixed rate debt.
[2] | The secured credit facility total capacity is $325,000, of which $247,335 was outstanding as of June 30, 2016.
[3] | The secured credit facility total capacity was $325,000, of which $271,500 was outstanding as of December 31, 2015.

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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 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 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 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 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + 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 + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + 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 + Details
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- Definition The effective interest rate at the end of 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 + Details
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- 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 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 + Details
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- 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 + Details
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- Definition The cash outflow for incremental, external costs directly pertaining to an early extinguishment of debt, including legal costs and prepayment penalties, and excluding interest and repayment of debt principal. + References No definition available. + Details
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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References No definition available. + Details
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- Definition Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + 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=66902209&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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + 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=66902209&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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