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Commitments and Contingencies - Additional Information (Detail) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) a Well | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Jul. 05, 2016 a
Loss Contingencies [Line Items] |  |  |  |
Estimated cost | $ |  | $ 10,125,475 | $ 3,044,851 |
Espinosa Road [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Area of nonfarmable land | a |  |  |  | 4.5
Bear Mountain [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Expended or accrued for capital improvements | $ |  | $ 7,900,000 |  |
Scenario, Forecast [Member] | Bear Mountain [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Removal area of old grape vineyards | a | 274 |  |  |
Number of new drilling wells | Well | 3 |  |  |
Area of new almond trees (over) | a | 800 |  |  |
Estimated cost | $ | $ 8,000,000 |  |  |

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