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Long-term Debt (Narrative) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Maturities of Long-term Debt [Abstract]      
Long-term debt outstanding $ 13,467 $ 13,581 $ 40,305
Long-Term Debt, Aggregate Principal Amounts Due, 2017   1,229  
Long-Term Debt, Aggregate Principal Amounts Due, 2018   223  
Long-Term Debt, Aggregate Principal Amounts Due, 2019   10,235  
Long-Term Debt, Aggregate Principal Amounts Due, 2020   246  
Long-Term Debt, Aggregate Principal Amounts Due, 2021   258  
Long-Term Debt, Aggregate Principal Amounts Due, Thereafter   $ 1,390