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Commitments and Contingencies (Narrative) (Detail) $ in Thousands, T in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended | 156 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017 | Dec. 31, 2016 T | Sep. 30, 2017 | Oct. 20, 2017 USD ($) | Dec. 02, 2014 USD ($)
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Estimated clean up costs |  |  |  |  |  | $ 342,000
Duration of extension of conditional use permit extension | 30 years |  |  |  |  |
Chiquita Canyon, LLC [Member] |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Annual tons of waste accepted at landfill | T |  |  | 3 |  |  |
Duration of permitting and environmental impact review for conditional use permit to authorize continued operation and expansion of landfill |  |  |  | 12 years 6 months |  |
Environmental Remediation Expense [Member] |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Estimated period to implement cleanup remedy |  | 7 years |  |  |  |
Required period of monitoring following the clean-up |  | 10 years |  |  |  |
Subsequent Event [Member] | Scenario, Forecast [Member] |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Estimate of total new fees and other new taxes over the life of the conditional use permit |  |  |  |  | $ 250,000 |

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