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Earnings per Share - Computation of Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net (Loss) Income, Basic	$ 14,529	$ 41,998
Net (Loss) Income, Diluted	$ 14,529	$ 41,998
Weighted Average Number of Shares Outstanding, Basic	2,089,055	2,211,985
Weighted Average Number of Shares Outstanding, Options	755,141	750,803
Weighted Average Number of Shares Outstanding, Diluted	2,844,196	2,962,788
Per Share Amount, Basic	$ 6.96	$ 18.99
Per Share Amount, Diluted	$ 5.11	$ 14.18

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