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Earnings Per Common Share - Reconciliation of Weighted-Average Common Shares Outstanding Used in Calculation of Basic EPS to Diluted EPS (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Numerator:      
Net income $ 10,281 $ 5,502 $ 29,353
Less: Net income allocated to participating securities (102) (78)  
Numerator for basic and diluted earnings available to common stockholders $ 10,179 $ 5,424  
Denominator:      
Weighted-average basic common shares outstanding (in shares) 66,951 48,101  
Weighted-average diluted common shares outstanding (in shares) 66,951 48,101  
Earnings per common share, basic (in usd per share) $ 0.15 $ 0.11  
Earnings per common share, diluted (in usd per share) $ 0.15 $ 0.11