Subsequent Events - Additional Information (Detail) (USD $) In Millions, unless otherwise specified		3 Months Ended	9 Months Ended
	Aug. 31, 2009	Sep. 30, 2012 Interest And Penalties	Sep. 30, 2012 Interest And Penalties	Jul. 31, 2012 Notes Payable
Subsequent Event
Tax penalties and interest waived		$ 7.8	$ 7.8
Promissory note entered into with Dell, principal amount				$ 13.3
Promissory note entered into with Dell, interest rate	7.03%			2.50%