Goodwill and Other Intangible Assets (Intangible Assets) (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 247,711	$ 243,589
Accumulated Amortization	134,530	89,074
Net Carrying Amount	113,181	154,515
Indefinite-lived other intangible asset	4,845	4,432
Total other intangible assets	252,556	248,021
Total other intangible assets, net carrying amount	118,026	158,947
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	150,863	149,317
Accumulated Amortization	72,014	39,018
Net Carrying Amount	78,849	110,299
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	83,469	80,938
Accumulated Amortization	53,540	45,190
Net Carrying Amount	29,929	35,748
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	12,039	11,994
Accumulated Amortization	8,149	4,361
Net Carrying Amount	3,890	7,633
Covenants not to compete
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,340	1,340
Accumulated Amortization	827	505
Net Carrying Amount	$ 513	$ 835