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Calculations of Basic and Diluted Loss per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share Disclosure [Line Items]
Net income (loss) - basic and diluted	$ 5,104	$ (1,586)	$ 1,272	$ (7,717)
Weighted-average shares outstanding - basic	13,912	13,619	13,824	13,460
Effect of dilutive securities:
Stock options and restricted stock	395		418
Weighted-average shares outstanding - diluted	14,307	13,619	14,242	13,460
Basic income (loss) per common share	$ 0.37	$ (0.12)	$ 0.09	$ (0.57)
Diluted income (loss) per common share	$ 0.36	$ (0.12)	$ 0.09	$ (0.57)

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

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.