Components of Basic and Diluted Loss Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Net loss available to common shareholders		$ (19,509)	$ (160,694)	$ (78,396)	$ (56,114)
Weighted average outstanding shares of common stock, basic		46,943,705	48,481,722	46,956,041	49,213,712
Weighted average common stock and equivalents		46,943,705	48,481,722	46,956,041	49,213,712
Loss per share, basic	[1]	$ (0.42)	$ (3.31)	$ (1.67)	$ (1.14)
Loss per share, diluted	[2]	$ (0.42)	$ (3.31)	$ (1.67)	$ (1.14)
Antidilutive incremental options and restricted stock awards and units		455,663	158,575	385,073	231,171

[1] The company calculates “Loss per share, basic” by dividing “Net loss available to common shareholders” by “Weighted average outstanding share 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”.