Subsequent Events - Additional Information (Detail) (USD $)	1 Months Ended
	Dec. 20, 2012	Nov. 12, 2012	Oct. 11, 2012	Feb. 28, 2013 Fiscal Year 2013	Jan. 31, 2013 Fiscal Year 2013 Asset Sale Agreement
Subsequent Event [Line Items]
Asset Sale for a total purchase price in cash					$ 18,750,000
Indemnification liability for breaches of representation and warranties					2,812,500
Indemnification obligations expiration period					12 months
Cash distribution per share	$ 0.50	$ 2.00	$ 10.00	$ 1.81
Cash distribution aggregate amount	$ 14,400,000	$ 57,800,000	$ 288,800,000	$ 52,300,000