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Summary of Significant Accounting Policies - Summary of Earnings (Loss) per Basic and Diluted Weighted Average Common Shares Outstanding (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Earnings Per Share [Abstract]                      
Net income (loss) $ (17,006) $ 1,016 $ 5,561 $ 9,506 $ 4,510 $ 3,396 $ 3,604 $ 4,734 $ (923) $ 16,244 $ 12,660
Basic weighted-average common shares outstanding                 9,445 9,377 9,333
Effect of potentially dilutive common shares                   68 51
Diluted weighted-average common shares outstanding                 9,445 9,445 9,384
Earnings (loss) per common share:                      
Earnings (loss) per basic common share $ (1.80) $ 0.11 $ 0.59 $ 1.01 $ 0.48 $ 0.36 $ 0.38 $ 0.51 $ (0.10) $ 1.73 $ 1.36
Earnings (loss) per diluted common share $ (1.80) $ 0.11 $ 0.59 $ 1.00 $ 0.48 $ 0.36 $ 0.38 $ 0.50 $ (0.10) $ 1.72 $ 1.35
Antidilutive shares excluded from net earnings per diluted common share calculation                 93 92 58