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Computation of Earnings Per Share - Calculation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Numerator                      
Net income $ 3,045 $ 206 $ 3,680 $ (256) $ 2,488 $ 2,555 $ 5,080 $ 2,738 $ 6,675 $ 12,861 $ 20,587
Determination of shares                      
Weighted-average common shares outstanding                 5,350 5,377 5,361
Dilutive effect - share-based awards                 16 5 106
Diluted weighted-average common shares outstanding                 5,366 5,382 5,467
Earnings per common share                      
Basic $ 0.58 $ 0.04 $ 0.68 $ (0.05) $ 0.46 $ 0.48 $ 0.94 $ 0.51 $ 1.25 $ 2.39 $ 3.84
Diluted $ 0.58 $ 0.04 $ 0.68 $ (0.05) $ 0.46 $ 0.48 $ 0.94 $ 0.50 $ 1.24 $ 2.39 $ 3.77