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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Net income-continuing operations $ 3,485 $ 11,186 $ 13,866 $ 13,657 $ 10,983 $ 11,209 $ 6,893 $ 3,526 $ 42,194 $ 32,611 $ 10,967
Net income (loss) from discontinued operations (1) (4) (14) (23) 941 (46) (7) (16) (43) 873 180
Net income $ 3,484 $ 11,182 $ 13,852 $ 13,634 $ 11,924 $ 11,163 $ 6,886 $ 3,510 $ 42,151 $ 33,484 $ 11,147
Weighted average common shares outstanding:                      
Basic                 39,568 39,337 38,873
Incremental shares with dilutive effect:                      
Diluted                 39,736 39,499 39,158
Basic income (loss) per share:                      
Continuing operations $ 0.09 $ 0.28 $ 0.35 $ 0.34 $ 0.28 $ 0.28 $ 0.18 $ 0.09 $ 1.07 $ 0.83 $ 0.28
Discontinued operations 0.00 0.00 0.00 0.00 0.02 0.00 0.00 0.00 0.00 0.02 0.00
Total net income per share 0.09 0.28 0.35 0.34 0.30 0.28 0.18 0.09 1.07 0.85 0.28
Diluted income (loss) per share:                      
Continuing operations 0.09 0.28 0.35 0.34 0.28 0.28 0.17 0.09 1.06 0.83 0.28
Discontinued Operations 0.00 0.00 0.00 0.00 0.02 0.00 0.00 0.00 0.00 0.02 0.00
Total Net income per share $ 0.09 $ 0.28 $ 0.35 $ 0.34 $ 0.30 $ 0.28 $ 0.17 $ 0.09 $ 1.06 $ 0.85 $ 0.28
Employee Stock Option [Member]                      
Incremental shares with dilutive effect:                      
Stock options                 0 0 152
Restricted Stock [Member]                      
Incremental shares with dilutive effect:                      
Stock options                 168 162 133