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Commitments and Contingencies (Additional Information) (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) claims legal_matter | Dec. 31, 2016 USD ($) claims | Dec. 31, 2015 USD ($) claims | Dec. 31, 2014 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Estimated total cleanup costs, accrual | $ 0.4 |  |  |
Number of pending claims | claims | 687 | 605 | 489 |
Number of claims dismissed | claims | 258 | 155 |  |
Number of claims settled | claims | 22 | 17 |  |
Claims settlements amount | $ 5.0 | $ 4.4 |  |
Asbestos-related liabilities, estimated liability | $ 76.2 | $ 52.0 |  |
Projection period (years) | 40 years | 10 years |  |
Environmental remediation expense (income) | $ 3.4 |  | $ 0.3 | $ 0.3
Connecticut Voluntary Corrective Action Program (VCAP) |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Estimated total cleanup costs, accrual | 1.7 |  | $ 3.2 |
Decrease in loss contingency accrual | $ 0.9 |  |  |
Superfund Sites Proceedings |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of pending claims | legal_matter | 1 |  |  |
Estimated total cleanup costs, cost sharing percentage | 2.00% |  |  |
Superfund Sites Proceedings | Minimum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss contingency, not accrued, best estimate | $ 18.8 |  |  |
Superfund Sites Proceedings | Maximum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss contingency, not accrued, best estimate | 29.6 |  |  |
PCB Contamination Proceedings |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
PCB contamination of the building and pond, liability recording during the period | 0.7 |  |  |
Remediation and monitoring costs incurred since inception related to the PCB soil and building contamination | 2.3 |  |  |
PCB Contamination Proceedings | Building |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Remediation and monitoring costs incurred since inception related to the PCB soil and building contamination |  |  |  | $ 0.5
PCB Contamination Proceedings | Pond |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Estimated total cleanup costs, accrual | $ 0.2 |  |  |

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