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Business Combination - Narrative (Details) - USD ($)
12 Months Ended
Aug. 31, 2016
Dec. 31, 2016
Business Acquisition [Line Items]    
Proceeds from sale of mortgaged based securities $ 1,100,000,000  
Apollo Residential Mortgage, Inc. Merger [Member]    
Business Acquisition [Line Items]    
Transaction-related expenses   $ 11,350,000
Loans Payable [Member]    
Business Acquisition [Line Items]    
Repayments of debt 804,000,000  
Loans Payable [Member] | Athene Loan Agreement [Member]    
Business Acquisition [Line Items]    
Principal amount 175,000,000  
Repayments of debt $ 175,000,000