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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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 110	$ 2,825	$ 683	$ 5,024
Weighted average common shares outstanding:
Basic	39,797	39,710	39,783	39,695
Incremental shares with dilutive effect:
Diluted	39,842	39,769	39,843	39,762
Basic income (loss) per share	$ 0.00	$ 0.07	$ 0.02	$ 0.13
Diluted income (loss) per share	$ 0.00	$ 0.07	$ 0.02	$ 0.13
Restricted Stock [Member]
Incremental shares with dilutive effect:
Restricted stock awards	45	59	60	67

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