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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share [Abstract]        
Net (Loss) Income, Basic $ (2,012) $ 4,924 $ 20,648 $ 5,589
Net (Loss) Income, Diluted $ (2,012) $ 4,924 $ 20,648 $ 5,589
Weighted Average Number of Shares Outstanding, Basic 1,642,933 2,293,964 2,223,399 2,294,444
Weighted Average Number of Shares Outstanding, Options   753,594 [1] 750,731 751,357
Weighted Average Number of Shares Outstanding, Diluted 1,642,933 3,047,558 2,974,130 3,045,801
Per Share Amount, Basic $ (1.22) $ 2.15 $ 9.29 $ 2.44
Per Share Amount, Diluted $ (1.22) $ 1.62 $ 6.94 $ 1.83
[1] The effect of the 767,500 outstanding stock options is antidilutive from the three months ended September 30, 2017 due to net loss reported for the period.