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Earnings Per Share - Computation of Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share [Abstract]        
Net Income, Basic $ (655) $ 10,799 $ (2,575) $ 16,841
Net Income, Diluted $ (655) $ 10,799 $ (2,575) $ 16,841
Weighted Average Number of Shares Outstanding, Basic 2,311,873 2,356,766 2,314,704 2,367,602
Weighted Average Number of Shares Outstanding, Options   754,847   753,464
Weighted Average Number of Shares Outstanding, Diluted 2,311,873 3,111,613 2,314,704 3,121,066
Per Share Amount, Basic $ (0.28) $ 4.58 $ (1.11) $ 7.11
Per Share Amount, Diluted $ (0.28) $ 3.47 $ (1.11) $ 5.40