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Commitments and Contingencies (Narrative) (Detail) T in Millions |  |  | 7 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Aug. 10, 2018 USD ($) | Mar. 06, 2018 USD ($) | Jul. 25, 2017 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2018 T | Dec. 31, 2014 USD ($)
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Estimated clean up costs |  |  |  |  |  | $ 342,000,000
Bridge and Thoroughfare Fee [Member] |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Loss contingency amount sought |  | $ 83,000 | $ 11,600,000 |  |  |
Noncompliance fee |  | $ 750 |  |  |  |
Fee paid | $ 11,600,000 |  |  |  |  |
Chiquita Canyon, LLC [Member] |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Annual tons of waste accepted at landfill | T |  |  |  |  | 2 |
Estimate of total new fees and other new taxes over the life of the conditional use permit |  |  |  | $ 300,000,000 |  |
Environmental Remediation Expense [Member] |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Estimated period to implement clean-up |  |  |  | seven years |  |
Required period of monitoring following the clean-up |  |  |  | 10 years |  |
Penalties [Member] | Bridge and Thoroughfare Fee [Member] |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Fee paid | 83,000 |  |  |  |  |
Fees [Member] | Bridge and Thoroughfare Fee [Member] |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Fee paid | $ 750 |  |  |  |  |

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