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Real Estate and Intangible Assets - Project Completions (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended | 14 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) a | Dec. 31, 2017 USD ($) a | Sep. 30, 2018 USD ($) | Jun. 07, 2018 a | Aug. 31, 2017 a
Real Estate Properties [Line Items] |  |  |  |  |  |
Total Acres | a |  | 73,205 | 63,014 |  |  |
Payments to develop real estate assets |  | $ 22,605 | $ 5,211 |  |  |
Gain (loss) on dispositions of real estate assets, net |  | $ 5,532 | $ (21) |  |  |
Florida |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Total Acres | a |  | 17,184 | 11,006 |  | 26 |
Colorado |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Payments for capital improvements |  | $ 1,400 |  |  |  |
Additional annualized straight-line rental income |  | $ 104 |  |  |  |
Total Acres | a |  | 31,448 | 31,450 |  |  |
Gain (loss) on dispositions of real estate assets, net |  | $ 433 |  |  |  |
2017 New Real Estate Activity |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Total Acres | a |  |  | 12,641 |  |  |
2017 New Real Estate Activity | Florida |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Payments for capital improvements | $ 748 |  |  |  |  |
Additional annualized straight-line rental income |  | 75 |  |  |  |
2017 New Real Estate Activity | Parrot Avenue | Okeechobee, FL |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Additional annualized straight-line rental income |  | 138 |  |  |  |
Total Acres | a |  |  | 1,910 |  |  | 1,884
Payments to develop real estate assets |  | 2,500 |  | $ 2,500 |  |
Diversified Financial Services, LLC | Colorado |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  | $ 1,295 |  |  |  |

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