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Earnings Per Common Share - Details of Earnings Per Share Calculations (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Net income-continuing operations $ 5,042 $ 494 $ 2,826 $ 2,199 $ 3,485 $ 11,186 $ 13,866 $ 13,657 $ 10,561 $ 42,194 $ 32,611
Net income (loss) from discontinued operations (30) (16) (1) 0 (1) (4) (14) (23) (47) (43) 873
Net income $ 5,012 $ 478 $ 2,825 $ 2,199 $ 3,484 $ 11,182 $ 13,852 $ 13,634 $ 10,514 $ 42,151 $ 33,484
Weighted average common shares outstanding:                      
Basic                 39,719 39,568 39,337
Incremental shares with dilutive effect:                      
Diluted                 39,782 39,736 39,499
Basic income (loss) per share:                      
Continuing operations $ 0.13 $ 0.01 $ 0.07 $ 0.06 $ 0.09 $ 0.28 $ 0.35 $ 0.34 $ 0.27 $ 1.07 $ 0.83
Discontinued operations 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02
Total net income per share 0.13 0.01 0.07 0.06 0.09 0.28 0.35 0.34 0.27 1.07 0.85
Diluted income (loss) per share:                      
Continuing operations 0.13 0.01 0.07 0.06 0.09 0.28 0.35 0.34 0.27 1.06 0.83
Discontinued operations 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02
Total net income per share $ 0.13 $ 0.01 $ 0.07 $ 0.06 $ 0.09 $ 0.28 $ 0.35 $ 0.34 $ 0.27 $ 1.06 $ 0.85
Restricted Stock [Member]                      
Incremental shares with dilutive effect:                      
Restricted stock awards                 63 168 162