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Amortization Expense for Amortized Intangible Assets (Detail)
$ in Thousands
Mar. 31, 2018
USD ($)
Finite-Lived Intangible Assets [Line Items]  
Amortization Expense, December 31, 2018 (nine months remaining) $ 7,978
Amortization Expense, December 31, 2019 10,513
Amortization Expense, December 31, 2020 9,910
Amortization Expense, December 31, 2021 9,395
Amortization Expense, December 31, 2022 $ 9,395