Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail)

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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Numerator (Basic and Diluted):        
Net income $ 13,523 $ 7,275 $ 33,101 $ 16,922
Denominator:        
Weighted average common shares issued and outstanding 36,624   36,613  
Deduct: Unvested RSAs (53)   (42)  
Add: Fully vested DSUs 2,276   2,276  
Weighted Average Common Shares Outstanding 38,847 [1]   38,847 [1]  
Basic earnings per common share $ 0.35 [1]   $ 0.85 [1]  
Weighted Average Common Shares Outstanding from above 38,847 [1]   38,847 [1]  
Add: Dilutive effect of RSUs and RSAs 164   102  
Weighted Average Common Shares Outstanding 39,011 [1]   38,949 [1]  
Diluted earnings per common share $ 0.35 [1]   $ 0.85 [1]  
[1] Earnings per share information has not been presented for periods prior to the IPO on October 31, 2013 as it was not meaningful.