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Components of Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Schedule Of Earnings Per Share Basic And Diluted [Line Items]        
Net income (loss) available to common shareholders $ (43,835) $ 60,907 $ (58,887) $ 104,580
Weighted average outstanding shares of common stock, basic 46,942,950 49,582,086 46,962,242 49,581,707
Dilutive effect of options and restricted stock awards and units   230,841   219,607
Weighted average common stock and equivalents 46,942,950 49,812,927 46,962,242 49,801,314
Earnings (loss) per share, basic [1] $ (0.93) $ 1.23 $ (1.25) $ 2.11
Earnings (loss) per share, diluted [2] $ (0.93) $ 1.22 $ (1.25) $ 2.10
Antidilutive incremental options and restricted stock awards and units 317,518 27,138 306,727 27,138
[1] The company calculates "Earnings (loss) per share, basic" by dividing "Net income (loss) available to common shareholders" by "Weighted average outstanding share of common stock, basic".
[2] The company calculates "Earnings (loss) per share, diluted" by dividing "Net income (loss) available to common shareholders" by "Weighted average common stock and equivalents".