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Amortization Expense for Amortized Intangible Assets (Detail)
$ in Thousands
Sep. 30, 2017
USD ($)
Finite-Lived Intangible Assets [Line Items]  
Amortization Expense, December 31, 2017 (three months remaining) $ 2,625
Amortization Expense, December 31, 2018 10,308
Amortization Expense, December 31, 2019 10,214
Amortization Expense, December 31, 2020 9,619
Amortization Expense, December 31, 2021 $ 9,046