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Amortization Expense for Amortized Intangible Assets (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Finite-Lived Intangible Assets [Line Items]  
Amortization Expense, December 31, 2018 $ 10,633
Amortization Expense, December 31, 2019 10,578
Amortization Expense, December 31, 2020 9,894
Amortization Expense, December 31, 2021 9,376
Amortization Expense, December 31, 2022 $ 9,374