Quarterly report pursuant to Section 13 or 15(d)

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

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Goodwill and Other Intangible Assets - Estimated Future Aggregate Amortization Expense of Intangible Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2018 $ 20,880  
2019 38,683  
2020 37,265  
2021 34,932  
2022 31,403  
Thereafter 95,657  
Intangible Assets, Net $ 258,820 $ 263,179