Annual report pursuant to Section 13 and 15(d)

Goodwill and Other Intangible Assets - Estimated Amortization of Intangible Assets (Detail)

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Goodwill and Other Intangible Assets - Estimated Amortization of Intangible Assets (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2018 $ 52,059
2019 47,118
2020 37,998
2021 31,941
2022 $ 23,164