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Commitments and Contingencies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 USD ($) a well | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Estimated cost |  | $ 9,797,438 | $ 3,246,646 | $ 2,619,084
Rental revenue |  | 17,305,469 | $ 11,888,091 | $ 7,170,318
Bear Mountain |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Expended or accrued for capital improvements |  | 8,000,000 |  |
Rental revenue |  | $ 5,000,000 |  |
Bear Mountain | Forecast |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Removal area of old grape vineyards | a | 274 |  |  |
Number of new drilling wells | well | 3 |  |  |
Area of new almond trees | a | 800 |  |  |
Estimated cost | $ 8,100,000 |  |  |

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