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Computation of Basic and Diluted Earnings per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Numerator:    
Net income $ 9,957 $ 5,628
Less: Income allocated to participating securities (113) (73)
Net income available to common stockholders $ 9,844 $ 5,555
Denominator:    
Weighted average shares - basic 64,710 64,297
Performance-based restricted stock awards      
Weighted average shares - diluted 64,710 64,297
Basic net income per share:    
Net income $ 0.15 $ 0.09
Diluted net income per share:    
Net income $ 0.15 $ 0.09