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Commitments and Contingencies (Additional Information) (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) claims claim | Dec. 31, 2018 USD ($) claims | Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items] |  |  |
Number of claims dismissed | 373 | 192 |
Number of claims settled | claims | 31 | 25 |
Claims settlements amount | $ 5.0 | $ 7.1 |
Legal fees | 0.7 | 1.2 |
Environmental remediation expense (income) | $ 1.7 | $ 0.7 | $ 3.4
Projection period (years) | 10 years | 40 years |
Connecticut Voluntary Corrective Action Program |  |  |
Loss Contingencies [Line Items] |  |  |
Environmental remediation expense | $ 1.4 |  |
Estimated total cleanup costs, accrual | $ 1.5 |  |

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