Goodwill and Other Intangible Assets, Net - Components of Other Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total gross definite life intangible assets	$ 298,213	$ 266,356
Accumulated Amortization	88,367	62,443
Net definite life intangible assets	$ 209,846	$ 203,913
Weighted-Average Remaining Life	11 years	12 years 6 months
Total indefinite life intangible assets	$ 88,933	$ 82,187
Total definite and indefinite life intangible assets, gross, excluding goodwill	387,146	348,543
Total definite and indefinite life intangible assets, net, excluding goodwill	298,779	286,100
Trade Names [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total indefinite life intangible assets	81,004	74,258
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	225,094	193,240
Accumulated Amortization	40,088	24,620
Net definite life intangible assets	$ 185,006	$ 168,620
Weighted-Average Remaining Life	11 years 10 months 24 days	14 years 1 month 6 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	$ 24,025
Accumulated Amortization	13,754	9,741
Net definite life intangible assets	$ 10,269	$ 14,284
Weighted-Average Remaining Life	3 years	4 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	$ 30,131	$ 30,725
Accumulated Amortization	22,131	15,684
Net definite life intangible assets	$ 8,000	$ 15,041
Weighted-Average Remaining Life	2 years 4 months 24 days	2 years
Patents [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total gross definite life intangible assets	$ 9,635	$ 10,629
Accumulated Amortization	9,222	10,049
Net definite life intangible assets	$ 413	$ 580
Weighted-Average Remaining Life	2 years 6 months	3 years 7 months 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	$ 9,330	$ 7,737
Accumulated Amortization	3,172	2,349
Net definite life intangible assets	$ 6,158	$ 5,388
Weighted-Average Remaining Life	7 years 10 months 24 days	14 years 1 month 6 days