Investments - Summary of Selected Financial Information for JCP Funds (Details) - JCP Funds [Member] - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Schedule of Equity Method Investments [Line Items]
Total assets	$ 73,261			$ 84,417
Total liabilities	66			75
Total partners' capital	73,195			84,342
Net increase (decrease) in net assets resulting from operations	$ (65,700)	$ (2,947)	$ (8,690)	$ (1,751)	$ (24,239)	$ 8,416