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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.