Schedule of Volume of Activity Futures Contracts (Details) (Eurodollar Future)	3 Months Ended
	Mar. 31, 2014 Contract
Eurodollar Future
Derivatives Fair Value [Line Items]
Number of contracts, Beginning balance	95,327
New positions opened	77,821
Early settlements	(56,817)
Settlements at maturity	(2,006)
Number of contracts, Ending balance	114,325