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v3.21.2

Contingencies - Additional Information (Detail) $ in Millions | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Apr. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) site | Dec. 31, 2020 USD ($)
Site Contingency [Line Items] |  |  |
Number of non-owned sites company is named potentially responsible party | site |  | 13 |
Number of non-owned sites the Company is identified as a de minimis party | site |  | 12 |
Number of non-owned sites company is in agreement on amount of de minimis settlement | site |  | 8 |
Number of non-owned sites company is continuing to investigate | site |  | 4 |
Total environmental reserves |  | $ 33.8 | $ 32.4
Payments for environmental liabilities |  | (3.1) |
Loss contingency accrual, payments | $ 6.8 |  |
HCC Industries |  |  |
Site Contingency [Line Items] |  |  |
Environmental expense |  | 4.5 |
Reserves related to an owned site acquired |  | $ 6.3 | $ 7.4

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