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Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Numerator:        
Net income (loss) $ (15,170) $ 6,721 $ (22,197) $ 40,984
Less: preferred stock distributions 42   42  
Net income (loss) available to common shareholders $ (15,212) $ 6,721 $ (22,239) $ 40,984
Denominator:        
Weighted average shares for basic earnings per share 14,304,426 14,202,859 14,276,594 14,181,530
Weighted average shares for diluted earnings per share 14,304,426 14,327,757 14,276,594 14,328,861
Basic [1] $ (1.06) $ 0.47 $ (1.56) $ 2.89
Diluted [1] $ (1.06) $ 0.47 $ (1.56) $ 2.86
Restricted Stock        
Denominator:        
Non-vested restricted stock, units and options   23,059   19,201
Restricted Stock Units        
Denominator:        
Non-vested restricted stock, units and options   0   2,954
Stock Options        
Denominator:        
Non-vested restricted stock, units and options   101,839   125,176
[1] For the quarter and nine months ended September 30, 2020, weighted average shares outstanding – basic was used to calculate diluted earnings per share due to a net loss for the period.