Fair Value of Financial Instruments Quantitative Information About Significant Unobservable Inputs (Parenthetical) (Detail) (Other assets, Equity Warrant Asset, Public Portfolio)	12 Months Ended
	Dec. 31, 2013
Other assets | Equity Warrant Asset, Public Portfolio
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted average contractual remaining term	6 years 3 months 18 days
Estimated remaining life	2 years 9 months 29 days