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Components of Basic and Diluted Loss Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share [Abstract]        
Net loss available to common shareholders $ (297,676) $ (19,509) $ (565,263) $ (78,396)
Weighted average outstanding shares of common stock, basic 47,068,079 46,943,705 47,067,887 46,956,041
Weighted average common stock and equivalents 47,068,079 46,943,705 47,067,887 46,956,041
Loss per share, basic [1] $ (6.32) $ (0.42) $ (12.01) $ (1.67)
Loss per share, diluted [2] $ (6.32) $ (0.42) $ (12.01) $ (1.67)
Antidilutive incremental options and restricted stock awards and units 193,238 455,663 338,039 385,073
[1] The company calculates “Loss per share, basic” by dividing “Net loss available to common shareholders” by “Weighted average outstanding shares of common stock, basic”.
[2] The company calculates “Loss per share, diluted” by dividing “Net loss available to common shareholders” by “Weighted average common stock and equivalents”. As a result of the net losses incurred, the company has excluded the antidilutive effect of incremental share equivalents related to options, restricted stock awards and restricted stock units from the “Loss per share, diluted” calculation for the quarters and nine month periods ended December 31, 2016 and 2015.