Other Financial Statement Information - Property, Plant and Equipment - Net (Detail) - USD ($) $ in Thousands |
Mar. 31, 2021 |
Dec. 31, 2020 |
---|---|---|
Property, Plant and Equipment [Line Items] | ||
Property, plant and equipment - Gross | $ 326,118 | $ 305,981 |
Less accumulated depreciation | (180,718) | (180,016) |
Property, plant and equipment - Net | 145,400 | 125,965 |
Land and Improvements [Member] | ||
Property, Plant and Equipment [Line Items] | ||
Property, plant and equipment - Gross | 21,507 | 22,132 |
Buildings and Improvements [Member] | ||
Property, Plant and Equipment [Line Items] | ||
Property, plant and equipment - Gross | 99,366 | 97,909 |
Machinery, Equipment and Aircraft [Member] | ||
Property, Plant and Equipment [Line Items] | ||
Property, plant and equipment - Gross | 195,897 | 176,377 |
Construction in Progress [Member] | ||
Property, Plant and Equipment [Line Items] | ||
Property, plant and equipment - Gross | $ 9,348 | $ 9,563 |