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Goodwill and Other Intangible Assets, Net - Components of Other Intangible Assets (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]    
Total gross definite life intangible assets $ 319,340 $ 298,213
Accumulated Amortization 95,872 88,367
Net definite life intangible assets $ 223,468 $ 209,846
Weighted-Average Remaining Life 11 years 2 months 12 days 11 years
Total indefinite life intangible assets $ 95,633 $ 88,933
Total definite and indefinite life intangible assets, gross, excluding goodwill 414,973 387,146
Total definite and indefinite life intangible assets, net, excluding goodwill 319,101 298,779
Trade Names [Member]    
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]    
Total indefinite life intangible assets 87,704 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 244,157 225,094
Accumulated Amortization 42,437 40,088
Net definite life intangible assets $ 201,720 $ 185,006
Weighted-Average Remaining Life 12 years 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 $ 24,023 $ 24,023
Accumulated Amortization 14,040 13,754
Net definite life intangible assets $ 9,983 $ 10,269
Weighted-Average Remaining Life 2 years 10 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 $ 30,178 $ 30,131
Accumulated Amortization 23,462 22,131
Net definite life intangible assets $ 6,716 $ 8,000
Weighted-Average Remaining Life 2 years 4 months 24 days 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 8,961 9,222
Net definite life intangible assets $ 342 $ 413
Weighted-Average Remaining Life 2 years 6 months 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 $ 11,679 $ 9,330
Accumulated Amortization 6,972 3,172
Net definite life intangible assets $ 4,707 $ 6,158
Weighted-Average Remaining Life 10 years 7 years 10 months 24 days