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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Net income - continuing operations $ 2,826 $ 13,866 $ 5,025 $ 27,523
Net income (loss) - discontinued operations (1) (14) (1) (37)
Net income $ 2,825 $ 13,852 $ 5,024 $ 27,486
Weighted average common shares outstanding        
Basic 39,710 39,580 39,695 39,554
Incremental shares with dilutive effect:        
Diluted 39,769 39,738 39,762 39,699
Basic income (loss) per share        
Continuing operations $ 0.07 $ 0.35 $ 0.13 $ 0.69
Discontinued operations 0.00 0.00 0.00 0.00
Total net income per share 0.07 0.35 0.13 0.69
Diluted income (loss) per share        
Continuing operations 0.07 0.35 0.13 0.69
Discontinued operations 0.00 0.00 0.00 0.00
Total net income per share $ 0.07 $ 0.35 $ 0.13 $ 0.69
Restricted Stock [Member]        
Incremental shares with dilutive effect:        
Restricted stock awards 59 158 67 145