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Components of Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Schedule Of Earnings Per Share Basic And Diluted [Line Items]    
Net income (loss) available to common shareholders $ (15,052) $ 43,673
Weighted average outstanding shares of common stock, basic 46,981,747 49,580,038
Dilutive effect of options and restricted stock awards and units   282,986
Weighted average common stock and equivalents 46,981,747 49,863,024
Earnings (loss) per share, basic [1] $ (0.32) $ 0.88
Earnings (loss) per share, diluted [2] $ (0.32) $ 0.88
Antidilutive incremental options and restricted stock awards and units 268,227  
[1] The company calculates "earnings per share, basic" by dividing "net income available to common shareholders" by "Weighted average outstanding share of common stock, basic".
[2] The company calculates "Earnings per share, diluted" by dividing "net income available to common shareholders" by "Weighted average common stock and equivalents".