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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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net (Loss) Income, Basic	$ 4,353	$ (2,012)	$ 7,115	$ 20,648
Net (Loss) Income, Diluted	$ 4,353	$ (2,012)	$ 7,115	$ 20,648
Weighted Average Number of Shares Outstanding, Basic	2,069,231	2,187,894	2,102,853	2,223,399
Weighted Average Number of Shares Outstanding, Options	756,366		754,558	750,731
Weighted Average Number of Shares Outstanding, Diluted	2,825,597	2,187,894	2,857,411	2,974,130
Per Share Amount, Basic	$ 2.10	$ (0.92)	$ 3.38	$ 9.29
Per Share Amount, Diluted	$ 1.54	$ (0.92)	$ 2.49	$ 6.94

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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