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Goodwill and Other Intangible Assets, Net - Components of Other Intangible Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Intangible Assets by Major Class [Line Items] |  |
Definite-lived intangibles, gross amount | $ 464,228 | $ 472,268
Intangibles, gross amount | 496,368 | 504,408
Definite-lived intangibles, accumulated amortization | (112,920) | (87,320)
Trade names [Member] |  |
Intangible Assets by Major Class [Line Items] |  |
Indefinite-lived intangibles, gross amount | 32,140 | 32,140
Customer relationships [Member] |  |
Intangible Assets by Major Class [Line Items] |  |
Definite-lived intangibles, gross amount | 423,513 | 430,730
Definite-lived intangibles, accumulated amortization | (94,889) | (74,469)
Other definite-lived intangibles [Member] |  |
Intangible Assets by Major Class [Line Items] |  |
Definite-lived intangibles, gross amount | 40,715 | 41,538
Definite-lived intangibles, accumulated amortization | $ (18,031) | $ (12,851)

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