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Organization and Significant Accounting Policies - Estimated Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]    
2016 $ 1,700  
2017 1,374  
2018 1,269  
2019 1,016  
2020 564  
Thereafter 1,221  
Net Carrying Amount $ 7,144 $ 10,464