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Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Schedule Of Earnings Per Share Basic And Diluted [Line Items]        
Net income (loss) $ 11,117 $ 33,208 $ 17,911 $ 42,031
Weighted average shares outstanding - basic 25,454,579 25,128,280 25,447,398 25,121,171
Net income per share $ 0.44 $ 1.32 $ 0.70 $ 1.67
Weighted average shares outstanding - diluted 25,680,997 25,312,938 25,659,869 25,301,783
Net income per share $ 0.43 $ 1.31 $ 0.70 $ 1.66