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Intangibles - Intangible Assets Other Than Goodwill and Trade Names (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Finite Lived Intangible Assets [Line Items] |  |
Intangible assets, net of accumulated amortization | $ 557,972 | $ 601,013
Patents And Other |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible assets, net of accumulated amortization | 15,192 | 17,554
Intangible assets, accumulated amortization | 42,928 | 43,021
Customer Relationships |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible assets, net of accumulated amortization | 542,780 | 583,459
Intangible assets, accumulated amortization | $ 151,007 | $ 126,824

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