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Investment in Unconsolidated and Consolidated Joint Ventures - Additional Information (Details) | 3 Months Ended | 12 Months Ended | 15 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2013 USD ($) ft² member | Dec. 31, 2017 USD ($) a ft² joint_venture | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2017 USD ($) a | Aug. 31, 2016 USD ($) | Sep. 30, 2013 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Investments in unconsolidated joint ventures |  | $ 30,031,000 | $ 33,803,000 |  | $ 30,031,000 |  |
Equity in earnings (losses) |  | 4,227,000 | 7,098,000 | $ 6,324,000 |  |  |
Borrowings |  | 114,272,000 | 97,318,000 |  | $ 114,272,000 |  |
Distribution of earnings from unconsolidated joint ventures |  | $ 7,200,000 | 4,500,000 | $ 7,200,000 |  |  |
Area of land to be developed (up to) (in acres) | a |  | 270,000 |  |  | 270,000 |  |
Promissory Note |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  | $ 4,750,000
Line of Credit |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Construction line of credit |  | $ 52,000,000 |  |  | $ 52,000,000 |  |
Petro Travel Plaza Holdings, LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Unconsolidated joint ventures, voting rights |  | 50.00% |  |  |  |  |
Ownership percentage |  | 60.00% |  |  | 60.00% |  |
Investment in unconsolidated joint ventures |  | $ 17,422,000 |  |  | $ 17,422,000 |  |
Borrowings |  | 15,279,000 | 15,275,000 |  | 15,279,000 |  |
Majestic Realty Co. |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Investments in unconsolidated joint ventures |  |  |  |  |  | $ 24,773,000 |
Investment in unconsolidated joint ventures |  | $ 0 |  |  | 0 |  |
Number of joint venture contracts | joint_venture |  | 2 |  |  |  |  |
Area of building owned and leased | ft² |  | 651,909 |  |  |  |  |
Majestic Realty Co. | Promissory Note |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Face amount |  |  |  |  |  | $ 21,080,000 |
TRC-MRC 2, LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Borrowings |  | $ 21,080,000 | 21,080,000 |  | 21,080,000 |  |
Excess distributions resulting in deficit balance |  | $ 496,000 |  |  | 496,000 |  |
TRCC-East |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Area of building owned and leased | ft² |  | 480,480 |  |  |  |  |
Excess distributions resulting in deficit balance |  | $ 3,000 |  |  | 3,000 |  |
Distribution of earnings from unconsolidated joint ventures |  |  |  |  | 1,952,000 |  |
Number of acres for development | ft² | 326,000 |  |  |  |  |  |
TRC-MRC 1, LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Borrowings |  | 19,433,000 | 0 |  | 19,433,000 |  |
Borrowings under joint venture |  | 25,000,000 |  |  | 25,000,000 |  |
Rockefeller Joint Ventures |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Investment in unconsolidated joint ventures |  | $ 12,609,000 |  |  | $ 12,609,000 |  |
Number of joint venture contracts | joint_venture |  | 3 |  |  |  |  |
Number of acres for development | a |  | 91 |  |  |  |  |
Area of land to be developed (up to) (in acres) | a |  | 500 |  |  | 500 |  |
Rockefeller Joint Ventures | Building Improvements |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Number of joint venture contracts | joint_venture |  | 2 |  |  |  |  |
Five West Parcel, LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Ownership percentage |  | 50.00% |  |  | 50.00% |  |
Area of building owned and leased | ft² |  | 606,000 |  |  |  |  |
Borrowings |  | $ 9,711,000 | 10,251,000 |  | $ 9,711,000 |  |
18-19 West, LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Ownership percentage |  | 50.00% |  |  | 50.00% |  |
Borrowings |  | $ 0 | 0 |  | $ 0 |  |
Number of acres for development | a |  | 61.5 |  |  |  |  |
TRCC/Rock Outlet Center, LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Investments in unconsolidated joint ventures | $ 87,000,000 |  |  |  |  |  |
Borrowings |  | $ 48,769,000 | 50,712,000 |  | 48,769,000 |  |
Construction loan percent of costs | 60.00% |  |  |  |  |  |
Equity contributions | 40.00% |  |  |  |  |  |
Number of members | member | 2 |  |  |  |  |  |
Centennial Founders, LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Borrowings |  | 0 | $ 0 |  | 0 |  |
Reduction of noncontrolling interest in joint venture |  | $ 11,039,000 |  |  | $ 11,039,000 |  |
Consolidated joint venture, ownership interest |  | 89.28% |  |  | 89.28% |  |

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