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Intangibles - Intangible Assets Other Than Goodwill and Trade Names (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
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Finite Lived Intangible Assets [Line Items] |  |
Intangible assets, net of accumulated amortization | $ 563,388 | $ 543,428
Patents And Other |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible assets, net of accumulated amortization | 13,071 | 15,360
Intangible assets, accumulated amortization | 43,280 | 42,538
Customer Relationships |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible assets, net of accumulated amortization | 550,317 | 528,068
Intangible assets, accumulated amortization | $ 95,984 | $ 87,334

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