Fair Value of Financial Instruments - Quantitative Information About Significant Unobservable Inputs (Additional Information) (Detail) (Other assets, Equity warrant assets)	3 Months Ended
	Mar. 31, 2015
Other assets | Equity warrant assets
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted average contractual remaining term	2 years 7 months 10 days
Estimated remaining life	5 years 9 months 18 days