Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share - Computation of Basic and Diluted Earnings per Share Subsequent to IPO (Detail)

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Earnings Per Share - Computation of Basic and Diluted Earnings per Share Subsequent to IPO (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Numerator (Basic and Diluted):        
Net income $ 12,796 $ 8,009 $ 19,578 $ 9,647
Denominator:        
Weighted average common shares issued and outstanding 36,615   36,608  
Deduct: Unvested RSAs (44)   (37)  
Add: Fully vested DSUs 2,276   2,276  
Weighted Average Common Shares Outstanding 38,847 [1]   38,847 [1]  
Basic earnings per common share $ 0.33 [1]   $ 0.50 [1]  
Weighted Average Common Shares Outstanding from above 38,847 [1]   38,847 [1]  
Add: Dilutive effect of RSUs and RSAs 79   70  
Weighted Average Common Shares Outstanding 38,926 [1]   38,917 [1]  
Diluted earnings per common share $ 0.33 [1]   $ 0.50 [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.