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Goodwill and Intangible Assets Estimated Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets    
2018 $ 35,112  
2019 57,590  
2020 42,732  
2021 36,042  
2022 35,266  
Thereafter 154,687  
Intangible assets, net $ 361,429 $ 182,430