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Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Expected Amortization Expense [Line Items]    
2017 $ 8,780  
2018 6,137  
2019 3,144  
2020 3,053  
2021 3,053  
Thereafter 8,944  
Amortized Intangible Assets, Net Amount $ 33,111 $ 42,185