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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, 2018
Dec. 31, 2017
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]    
Total gross definite life intangible assets $ 297,379 $ 292,525
Accumulated Amortization 82,220 73,481
Net definite life intangible assets $ 215,159 $ 219,044
Weighted-Average Remaining Life 11 years 9 months 18 days 11 years 10 months 24 days
Total indefinite life intangible assets $ 92,024 $ 91,977
Total definite and indefinite life intangible assets, gross, excluding goodwill 389,403 384,502
Total definite and indefinite life intangible assets, net, excluding goodwill 307,183 311,021
Trade Names [Member]    
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]    
Total indefinite life intangible assets 84,095 84,048
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 208,070 203,743
Accumulated Amortization 32,281 27,820
Net definite life intangible assets $ 175,789 $ 175,923
Weighted-Average Remaining Life 13 years 4 months 24 days 13 years 8 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 $ 24,026 $ 24,025
Accumulated Amortization 10,607 9,741
Net definite life intangible assets $ 13,419 $ 14,284
Weighted-Average Remaining Life 3 years 10 months 24 days 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 $ 34,730 $ 34,333
Accumulated Amortization 18,581 16,180
Net definite life intangible assets $ 16,149 $ 18,153
Weighted-Average Remaining Life 2 years 6 months 2 years 8 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 $ 10,630 $ 10,629
Accumulated Amortization 10,296 10,049
Net definite life intangible assets $ 334 $ 580
Weighted-Average Remaining Life 5 years 2 months 12 days 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 $ 19,923 $ 19,795
Accumulated Amortization 10,455 9,691
Net definite life intangible assets $ 9,468 $ 10,104
Weighted-Average Remaining Life 8 years 8 months 12 days 9 years 2 months 12 days