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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

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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