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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, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Net (Loss) Income, Basic		$ 22,297	$ (1,860)
Net (Loss) Income, Diluted	[1]	$ 22,297	$ (1,860)
Weighted Average Number of Shares Outstanding, Basic		2,283,011	2,295,177
Weighted Average Number of Shares Outstanding, Options		752,529	749,585
Weighted Average Number of Shares Outstanding, Diluted	[1]	3,035,540	3,044,762
Per Share Amount, Basic		$ 9.77	$ (0.81)
Per Share Amount, Diluted	[1]	$ 7.35	$ (0.81)
[1] The effect of the 767,500 outstanding stock options is antidilutive for the three months ended March 31, 2016 due to a net loss reported for the period.

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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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