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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, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Net income from continuing operations	$ 11,186	$ 11,209	$ 38,710	$ 21,628
Income (loss) from discontinued operations	(4)	(46)	(42)	(68)
Net income	$ 11,182	$ 11,163	$ 38,668	$ 21,560
Basic income (loss) per share
Continuing	$ 0.28	$ 0.28	$ 0.97	$ 0.55
Discontinued	0.00	0.00	0.00	0.00
Total	0.28	0.28	0.97	0.55
Diluted income (loss) per share
Continuing	0.28	0.28	0.97	0.55
Discontinued	0.00	0.00	0.00	0.00
Total	$ 0.28	$ 0.28	$ 0.97	$ 0.55
Weighted average common shares outstanding:
Basic	39,580	39,358	39,563	39,330
Diluted	39,733	39,541	39,711	39,467

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