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Goodwill and Intangible Assets - Estimated Annual Amortization Expense of our Intangible Assets (Detail)
$ in Thousands
Sep. 30, 2016
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2016 $ 3,612
2017 2,804
2018 2,240
2019 1,712
2020 1,057
2021 $ 565