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Common Stock and Earnings Per Share - Details of Earnings Per Share Calculations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income - continuing operations	$ 494	$ 11,186	$ 5,520	$ 38,710
Net income (loss) - discontinued operations	(16)	(4)	(17)	(42)
Net income	$ 478	$ 11,182	$ 5,503	$ 38,668
Weighted average common shares outstanding
Basic	39,736	39,580	39,709	39,563
Incremental shares with dilutive effect:
Diluted	39,834	39,733	39,786	39,711
Basic income (loss) per share
Continuing operations	$ 0.01	$ 0.28	$ 0.14	$ 0.97
Discontinued operations	0.00	0.00	0.00	0.00
Total net income per share	0.01	0.28	0.14	0.97
Diluted income (loss) per share
Continuing operations	0.01	0.28	0.14	0.97
Discontinued operations	0.00	0.00	0.00	0.00
Total net income per share	$ 0.01	$ 0.28	$ 0.14	$ 0.97
Restricted Stock [Member]
Incremental shares with dilutive effect:
Restricted stock awards	98	153	77	148

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