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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
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net (Loss) Income, Basic	$ 3,286	$ 22,297
Net (Loss) Income, Diluted	$ 3,286	$ 22,297
Weighted Average Number of Shares Outstanding, Basic	2,142,396	2,283,011
Weighted Average Number of Shares Outstanding, Options	751,326	752,529
Weighted Average Number of Shares Outstanding, Diluted	2,893,722	3,035,540
Per Share Amount, Basic	$ 1.53	$ 9.77
Per Share Amount, Diluted	$ 1.14	$ 7.35

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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