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Debt (Detail) - USD ($)
May 09, 2017
Mar. 31, 2017
Dec. 31, 2016
Long-term debt:      
Outstanding debt   $ 25,847,000 $ 25,847,000
Revolving credit facility      
Long-term debt:      
Outstanding debt   $ 25,800,000  
Weighted average interest rate   2.44%  
Revolving credit facility | Subsequent Event      
Long-term debt:      
Credit facility, increase in aggregate principal amount of commitments available $ 75,000,000