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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, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net (Loss) Income, Basic	$ 41,998	$ 3,444
Net (Loss) Income, Diluted	$ 41,998	$ 3,444
Weighted Average Number of Shares Outstanding, Basic	2,211,985	2,293,688
Weighted Average Number of Shares Outstanding, Options	750,803	751,563
Weighted Average Number of Shares Outstanding, Diluted	2,962,788	3,045,251
Per Share Amount, Basic	$ 18.99	$ 1.50
Per Share Amount, Diluted	$ 14.18	$ 1.13

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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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