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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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net (Loss) Income, Basic	$ 361	$ 2,525	$ 22,659	$ 665
Net (Loss) Income, Diluted	$ 361	$ 2,525	$ 22,659	$ 665
Weighted Average Number of Shares Outstanding, Basic	2,199,750	2,294,195	2,241,310	2,294,686
Weighted Average Number of Shares Outstanding, Options	749,491	750,205	751,019	749,909
Weighted Average Number of Shares Outstanding, Diluted	2,949,261	3,044,400	2,992,329	3,044,595
Per Share Amount, Basic	$ 0.16	$ 1.10	$ 10.11	$ 0.29
Per Share Amount, Diluted	$ 0.12	$ 0.83	$ 7.57	$ 0.22

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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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