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Earnings Per Share - Schedule of Computations of Basic and Diluted Earnings 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
Numerator:        
Net income $ 9,109 $ 7,148 $ 12,574 $ 13,405
Change in the value of Private Placement Warrants (8,750) (858) (8,040) (1,190)
Net income Attributable to Parent $ 359 $ 6,290 $ 4,534 $ 12,215
Common Stock [Member]        
Denominator:        
Weighted average common shares outstanding-basic 10,814,765 10,794,229 10,804,720 10,676,792
Incremental shares from assumed exercise of Private Placement Warrants, SAR and restricted stock, if applicable 254,160 373,369 316,001 448,324
Weighted average common shares outstanding-diluted 11,068,925 11,167,598 11,120,721 11,125,116
Earnings per share of common stock - basic and diluted        
Earnings per share of common stock - basic $ 0.84 $ 0.66 $ 1.16 $ 1.26
Earnings per share of common stock - diluted $ 0.03 $ 0.56 $ 0.41 $ 1.10