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v3.20.4

Segment Reporting - Reconciliation of Segment Information to Consolidated Financial Statements (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |
Operating income |  | $ 171,522 | $ 127,260 | $ 149,265
Business restructuring | [1] | (1,212) | (2,744) | (2,588)
Interest expense, net |  | (5,409) | (5,932) | (10,771)
Other, net |  | 4,954 | 4,571 | (725)
Consolidated income before income taxes |  | 171,067 | 125,899 | 137,769
Assets |  | 1,752,336 | 1,579,367 | 1,514,614
Capital expenditures |  | 125,792 | 105,572 | 86,647
Depreciation and amortization |  | 81,860 | 78,701 | 81,115
Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income |  | 251,281 | 208,762 | 211,552
Assets |  | 1,472,738 | 1,331,929 | 1,285,200
Capital expenditures |  | 121,163 | 103,354 | 84,398
Depreciation and amortization |  | 77,988 | 76,056 | 78,917
Segment Reconciling Items [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Unallocated corporate expenses | [2] | (78,547) | (78,758) | (59,699)
Unallocated corporate assets |  | 279,598 | 247,438 | 229,414
Unallocated corporate expenditures |  | 4,629 | 2,218 | 2,249
Unallocated corporate depreciation expenses |  | $ 3,872 | $ 2,645 | $ 2,198
[1] | See Note 22 regarding business restructuring costs.
[2] | Unallocated corporate expenses primarily comprise corporate administrative expenses (e.g., corporate finance, legal, human resources, information systems, deferred compensation and environmental remediation) that are not included in segment operating income and not used to evaluate segment performance.

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