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Other Financial Statement Information - Additional Information (Detail) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Nov. 02, 2016 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Inventory Disclosure [Abstract] |  |  |  |
Cost of inventories for certain materials using LIFO method |  | $ 32.0 | $ 32.0 |
Inventory reserves for slow-moving and obsolete inventory |  | 9.9 | 8.9 |
Depreciation of property and equipment |  | 12.2 | 12.3 | $ 12.1
Financing leases of machinery, equipment and aircraft |  | 0.3 | $ 0.3 |
Accrued estimate for losses |  | $ 2.2 |  |
Name of plaintiff |  | Altalink, L.P. |  |
Complaint filling date |  | November 2016 |  |
Estimated damages from defendants | $ 56.0 |  |  |

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