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Estimated Future Amortization Expense of Other Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]    
2017 $ 3,759  
2018 3,759  
2019 3,734  
2020 3,518  
2021 3,518  
Thereafter 3,867  
Total estimated future amortization expense $ 22,155 $ 26,008