Components of Basic and Diluted Loss Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net loss available to common shareholders		$ (524,434)	$ (89,097)
Weighted average outstanding shares of common stock, basic		47,121,304	47,067,715
Weighted average shares of common stock and equivalents		47,121,304	47,067,715
Loss per share, basic	[1]	$ (11.13)	$ (1.89)
Loss per share, diluted	[2]	$ (11.13)	$ (1.89)
Antidilutive incremental options and restricted stock awards and units		183	475,873

[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 shares of common stock and equivalents”.