Income Tax (Provision) Benefit - Additional Information (Detail) (USD $)	3 Months Ended			9 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Statutory tax rate	39.60%		39.60%	39.60%	39.60%
Tax provision, current	$ 0		$ 0	$ 0	$ 0
Tax benefit recognized related to new tax position		(411,600,000)
Establishment/reversal of valuation allowance for deferred tax assets	(103,900,000)	103,900,000
Cumulative net operating losses for tax purposes	272,300,000			272,300,000
Deferred tax asset	$ 107,812,000			$ 107,812,000