Goodwill and Other Intangible Assets, Net - Components of Other Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total gross definite life intangible assets	$ 321,392	$ 298,213
Accumulated Amortization	108,478	88,367
Net definite life intangible assets	$ 212,914	$ 209,846
Weighted-Average Remaining Life	10 years 9 months 18 days	11 years
Total indefinite life intangible assets	$ 95,586	$ 88,933
Total definite and indefinite life intangible assets, gross, excluding goodwill	416,978	387,146
Total definite and indefinite life intangible assets, net, excluding goodwill	308,500	298,779
Trade Names [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total indefinite life intangible assets	87,657	81,004
Licenses [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total indefinite life intangible assets	7,929	7,929
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	241,509	225,094
Accumulated Amortization	52,379	40,088
Net definite life intangible assets	$ 189,130	$ 185,006
Weighted-Average Remaining Life	11 years 6 months	11 years 10 months 24 days
Technology [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total gross definite life intangible assets	$ 24,022	$ 24,023
Accumulated Amortization	15,750	13,754
Net definite life intangible assets	$ 8,272	$ 10,269
Weighted-Average Remaining Life	2 years 4 months 24 days	3 years
Noncompete Agreements [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total gross definite life intangible assets	$ 29,616	$ 30,131
Accumulated Amortization	26,055	22,131
Net definite life intangible assets	$ 3,561	$ 8,000
Weighted-Average Remaining Life	3 years	2 years 4 months 24 days
Patents [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total gross definite life intangible assets	$ 9,303	$ 9,635
Accumulated Amortization	9,088	9,222
Net definite life intangible assets	$ 215	$ 413
Weighted-Average Remaining Life	2 years 8 months 12 days	2 years 6 months
All Other [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total gross definite life intangible assets	$ 16,942	$ 9,330
Accumulated Amortization	5,206	3,172
Net definite life intangible assets	$ 11,736	$ 6,158
Weighted-Average Remaining Life	8 years 4 months 24 days	7 years 10 months 24 days