Quantitative Information About Significant Unobservable Inputs (Parenthetical) (Detail) (Other assets, Equity Warrant Asset)	6 Months Ended	9 Months Ended
	Jun. 30, 2012	Sep. 30, 2012 Year
Other assets | Equity Warrant Asset
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Marketability discount	15.00%	22.50%
Weighted average contractual remaining term		6.6
Estimated remaining life		3.0
Remaining life assumption	40.00%	45.00%