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Commitments and Contingencies (Additional Information) (Detail) | 12 Months Ended
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Dec. 31, 2015 USD ($) claims LegalMatter | Dec. 31, 2014 USD ($) claims | Dec. 31, 2013 USD ($) claims
Loss Contingencies [Line Items] |  |  |
Number of pending claims | claims | 488 | 440 | 362
Estimated total cleanup costs, accrual | $ 400,000 |  |
Number of claims dismissed | claims | 231 | 104 |
Number of claims settled | claims | 6 | 13 |
Claims settlements amount | $ 1,600,000 | $ 3,200,000 |
Asbestos forecast claim period | 10 years |  |
Asbestos-related liabilities, estimated liability | $ 56,600,000 | 56,500,000 |
Asbestos-related liabilities, estimated insurance recovery | 53,400,000 | 53,000,000 |
Environmental remediation expense (income) | $ 300,000 | (800,000) | $ 500,000
Superfund Sites Proceedings |  |  |
Loss Contingencies [Line Items] |  |  |
Number of pending claims | LegalMatter | 1 |  |
Estimated total cleanup costs, cost sharing percentage | 2.00% |  |
Loss contingency, minimum possible loss | $ 18,800,000 |  |
Loss contingency, maximum possible loss | 29,600,000 |  |
PCB Contamination Proceedings |  |  |
Loss Contingencies [Line Items] |  |  |
PCB contamination of the building and pond, liability recording during the period | 700,000 |  |
Remediation and monitoring costs incurred since inception related to the PCB soil and building contamination | 2,500,000 |  |
PCB Contamination Proceedings | Building |  |  |
Loss Contingencies [Line Items] |  |  |
Remediation and monitoring costs incurred since inception related to the PCB soil and building contamination |  | $ 500,000 |
PCB Contamination Proceedings | Pond |  |  |
Loss Contingencies [Line Items] |  |  |
Estimated total cleanup costs, accrual | 200,000 |  |
Connecticut Voluntary Corrective Action Program (VCAP) |  |  |
Loss Contingencies [Line Items] |  |  |
Estimated total cleanup costs, accrual | 3,200,000 |  |
CT DEEP |  |  |
Loss Contingencies [Line Items] |  |  |
Estimated total cleanup costs, accrual | $ 0 |  |

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