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
Mar. 31, 2014
Mar. 31, 2013
Numerator (Basic and Diluted):    
Net income $ 6,782 $ 1,638
Denominator:    
Common shares issued and outstanding 36,601  
Deduct: Unvested RSAs (30)  
Add: Fully vested DSUs 2,276  
Weighted Average Common Shares Outstanding 38,847 [1]  
Basic earnings per common share $ 0.17 [1]  
Weighted Average Common Shares Outstanding 38,847 [1]  
Add: Dilutive effect of RSUs and RSAs 60  
Weighted Average Common Shares Outstanding 38,907 [1]  
Diluted earnings per common share $ 0.17 [1]  
[1] Earnings per share information has not been presented for periods prior to the IPO on October 31, 2013. See Note 10 - "Earning Per Share."