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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

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