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Commitments and Contingencies (Additional Information) (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) claims | Dec. 31, 2017 USD ($) claims | Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items] |  |  |
Number of claims dismissed | claims | 192 | 258 |
Number of claims settled | claims | 25 | 22 |
Claims settlements amount | $ 7.1 | $ 5.0 |
Projection period (years) | 40 years | 10 years |
Asbestos-related claims | $ 70.3 | $ 76.2 |
Recorded third-party environmental recoveries receivable | 63.8 | 69.2 |
Environmental remediation expense (income) | $ 0.7 | $ 3.4 | $ 0.3
Minimum |  |  |
Loss Contingencies [Line Items] |  |  |
Operating lease period | 1 year |  |
Maximum |  |  |
Loss Contingencies [Line Items] |  |  |
Operating lease period | 5 years |  |
Connecticut Voluntary Corrective Action Program |  |  |
Loss Contingencies [Line Items] |  |  |
Environmental remediation expense | $ 0.7 |  |
Estimated total cleanup costs, accrual | $ 1.7 |  |

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