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Intangible Assets and Goodwill - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Goodwill [Line Items]      
Goodwill $ 10,200,000   $ 10,100,000
Pretax impairment charge recorded during the period for intangible assets related to our credit hedge funds 0    
Intangible asset amortization expense, excluding impairment losses $ 2,500,000 $ 10,400,000