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Regulatory Requirements - Narrative (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Brokers and Dealers [Abstract]    
Capital requirement based on outstanding UPB of owned and subserviced portfolio $ 553.7 $ 827.6
Number of days from fiscal year end that servicer is obliged to provide audited financial statements 90 days 90 days