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Other Financial Statement Information - Additional Information (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 02, 2016 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Inventory [Line Items] |  |  |  |  |  |
Cost of inventories for certain materials using LIFO method |  | $ 32.4 |  | $ 32.4 |  | $ 32.0
Expense (benefit) charge to earnings from LIFO inventory changes |  | $ 1.3 |  | 1.8 | $ 0.2 |
Accrued estimate for losses |  |  |  | $ 2.2 |  | $ 2.2
Name of plaintiff |  |  |  | Altalink, L.P. |  |
Complaint filling date |  |  |  | November 2016 |  |
Estimated damages from defendants | $ 56.0 |  |  |  |  |
Maximum [Member] |  |  |  |  |  |
Inventory [Line Items] |  |  |  |  |  |
Expense (benefit) charge to earnings from LIFO inventory changes |  |  | $ 0.1 |  |  |

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