Goodwill and Other Intangible Assets, Net - Components of Other Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total gross definite life intangible assets	$ 334,430	$ 324,974
Accumulated Amortization	124,960	117,287
Net definite life intangible assets	$ 209,470	$ 207,687
Weighted-Average Remaining Life	10 years 1 month 6 days	10 years 9 months 18 days
Total indefinite life intangible assets	$ 81,869	$ 95,537
Total definite and indefinite life intangible assets, gross, excluding goodwill	416,299	420,511
Total definite and indefinite life intangible assets, net, excluding goodwill	291,339	303,224
Trade Names [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total indefinite life intangible assets	79,570	93,083
Licenses [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total indefinite life intangible assets	2,299	2,454
Customer-Related Intangible Assets [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total gross definite life intangible assets	237,239	250,788
Accumulated Amortization	59,127	57,332
Net definite life intangible assets	$ 178,112	$ 193,456
Weighted-Average Remaining Life	10 years 7 months 6 days	11 years 2 months 12 days
Technology [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total gross definite life intangible assets	$ 24,023	$ 24,024
Accumulated Amortization	19,174	16,608
Net definite life intangible assets	$ 4,849	$ 7,416
Weighted-Average Remaining Life	1 year 4 months 24 days	2 years 2 months 12 days
Noncompete Agreements [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total gross definite life intangible assets	$ 30,122	$ 30,378
Accumulated Amortization	28,956	28,198
Net definite life intangible assets	$ 1,166	$ 2,180
Weighted-Average Remaining Life	6 years 2 months 12 days	4 years 2 months 12 days
Patents [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total gross definite life intangible assets	$ 12,289	$ 12,232
Accumulated Amortization	11,995	11,954
Net definite life intangible assets	$ 294	$ 278
Weighted-Average Remaining Life	0 years	1 month 6 days
All Other [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total gross definite life intangible assets	$ 30,757	$ 7,552
Accumulated Amortization	5,708	3,195
Net definite life intangible assets	$ 25,049	$ 4,357
Weighted-Average Remaining Life	8 years 7 months 6 days	9 years 4 months 24 days