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Organization and Basis of Presentation - Additional Information (Detail) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Organization And Basis Of Presentation [Line Items] |  |  |
Notes payable to affiliates | $ 15,346,000 |  | $ 14,893,000
Notes payable maturity | 2018 |  |
Credit facilities and project related loans scheduled to mature during the remainder of 2018 | $ 29,391,000 |  |
Reclassification of cash and restricted cash | (748,000) | $ (1,778,000) |
Accounting Standards Update 2016-15 [Member] |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |
Reclassification of cash and restricted cash | 1,200,000 | $ 1,500,000 |
Comstock Asset Management, L.C. [Member] |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |
Fixed annual payment | 1,000,000 |  |
Aggregate deposit | $ 2,500,000 |  |

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