Income Tax Benefit (Provision) - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]
Statutory tax rate	39.60%	35.00%	39.60%	35.00%
Tax benefit recognized related to new tax position	$ 411,600		$ 411,600
Establishment/reversal of valuation allowance for deferred tax assets	$ 103,867	$ 49,200	$ 103,867