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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
	Mar. 31, 2017	Mar. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 573	$ 2,199
Weighted average common shares outstanding:
Basic	39,760	39,681
Incremental shares with dilutive effect:
Diluted	39,770	39,755
Basic income per share	$ 0.01	$ 0.06
Diluted income per share	$ 0.01	$ 0.06
Restricted Stock [Member]
Incremental shares with dilutive effect:
Restricted stock awards	10	74

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