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Debt Securitization Transactions (Details)
1 Months Ended 3 Months Ended
May 09, 2017
USD ($)
Apr. 28, 2017
USD ($)
Mar. 09, 2017
USD ($)
Feb. 06, 2017
USD ($)
May 05, 2017
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Jun. 30, 2015
USD ($)
loan
Apr. 30, 2015
USD ($)
loan
Jan. 31, 2015
USD ($)
loan
Nov. 30, 2014
USD ($)
loan
Aug. 31, 2014
USD ($)
loan
May 30, 2014
USD ($)
loan
Nov. 30, 2013
USD ($)
loan
Subsequent Event                              
Debt Instrument [Line Items]                              
Repayments of long-term debt         $ 2,865,000                    
Subsequent Event | IH1 2014-1                              
Debt Instrument [Line Items]                              
Repayments of long-term debt   $ 420,000,000                          
Subsequent Event | IH1 2014-3                              
Debt Instrument [Line Items]                              
Repayments of long-term debt $ 510,000,000                            
Secured Debt                              
Debt Instrument [Line Items]                              
Repayments of long-term debt           $ 1,030,471,000 $ 29,598,000                
Secured Debt | IH1 2013-1                              
Debt Instrument [Line Items]                              
Debt instrument, number of loans | loan                             6
Debt instrument, face amount                             $ 479,137,000
Debt instrument, number of loans sold at par | loan                             6
Secured Debt | IH1 2014-1                              
Debt Instrument [Line Items]                              
Debt instrument, number of loans | loan                           6  
Debt instrument, face amount                           $ 993,738,000  
Debt instrument, number of loans sold at par | loan                           6  
Repayments of long-term debt     $ 260,000,000 $ 291,500,000                      
Secured Debt | IH1 2014-2                              
Debt Instrument [Line Items]                              
Debt instrument, face amount                         $ 719,935,000    
Debt instrument, number of loans sold at par | loan                         7    
Debt instrument, number of loans bearing variable interest rate | loan                         6    
Debt instrument, number of loans bearing fixed interest rate | loan                         1    
Debt instrument, unamortized discount                         $ 3,970,000    
Secured Debt | IH1 2014-3                              
Debt Instrument [Line Items]                              
Debt instrument, face amount                       $ 769,322,000      
Debt instrument, number of loans sold at par | loan                       7      
Debt instrument, number of loans bearing variable interest rate | loan                       6      
Debt instrument, number of loans bearing fixed interest rate | loan                       1      
Debt instrument, unamortized discount                       $ 7,235,000      
Secured Debt | IH2 2015-1                              
Debt Instrument [Line Items]                              
Debt instrument, number of loans | loan                     7        
Debt instrument, face amount                     $ 540,854,000        
Debt instrument, number of loans sold at par | loan                     6        
Debt instrument, unamortized discount           $ 0   $ 55,000     $ 622,000        
Secured Debt | IH2 2015-2                              
Debt Instrument [Line Items]                              
Debt instrument, number of loans | loan                   7          
Debt instrument, face amount                   $ 636,686,000          
Secured Debt | IH2 2015-3                              
Debt Instrument [Line Items]                              
Debt instrument, number of loans | loan                 7            
Debt instrument, face amount                 $ 1,193,950,000            
Secured Debt | Subsequent Event                              
Debt Instrument [Line Items]                              
Repayments of long-term debt         $ 2,865,000                    
Secured Debt | Subsequent Event | IH1 2014-3                              
Debt Instrument [Line Items]                              
Repayments of long-term debt $ 510,000,000                            
Secured Debt | Class G Certificates                              
Debt Instrument [Line Items]                              
Debt instrument, loan principal as a percentage of mortgage pool           5.00%                  
Debt instrument, interest rate, stated percentage           0.0005%