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Debt - Narrative (Details)
 1 Months Ended 2 Months Ended 12 Months Ended
Feb. 29, 2016
USD ($)
day
Feb. 28, 2018
USD ($)
Sep. 30, 2015
USD ($)
single_family_property
Mar. 31, 2015
USD ($)
property
Dec. 31, 2014
USD ($)
property
Nov. 30, 2014
USD ($)
property
Sep. 30, 2014
USD ($)
property
May 31, 2014
USD ($)
extension_option
floating_rate_component
property
Feb. 23, 2018
USD ($)
property
Dec. 31, 2017
USD ($)
extension_option
single_family_property
property
Dec. 31, 2016
USD ($)
single_family_property
property
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]                        
Loan payoff amount                   $ 477,879,000 $ 381,117,000 $ 19,739,000
Gain (loss) on extinguishment of debt                   (6,555,000) (13,408,000) 0
Single-family properties                   8,064,980,000 7,547,856,000  
Deferred financing costs, net                   38,026,000 51,636,000  
Payments of debt issuance costs                   $ 3,974,000 10,476,000 25,335,000
Percentage portion of principal amount for which monthly payment is required                   0.083%    
Minimum coverage ratio                   1.20    
Proceeds from asset-backed securitizations                   $ 0 0 $ 1,030,559,000
Debt instrument, unamortized discount                   895,000 1,883,000  
Convertible Debt                   111,697,000 108,148,000  
Debt instrument, convertible, carrying amount of equity component                   2,408,000 4,969,000  
Convertible notes payable, noncurrent                   111,700,000    
Total debt                   2,517,216,000 2,981,062,000  
Subsequent Events                        
Debt Instrument [Line Items]                        
Number of properties acquired | property                 550      
Subsequent Events | Designated as Hedging Instrument | Treasury Lock                        
Debt Instrument [Line Items]                        
Derivative interest rate                 4.08%      
Credit Agreement                        
Debt Instrument [Line Items]                        
Debt instrument, accordion feature, higher borrowing capacity option                   $ 1,750,000,000    
American Residential Properties Inc.                        
Debt Instrument [Line Items]                        
Purchase price $ 1,322,461,000                      
Ellington portfolio acquisition                        
Debt Instrument [Line Items]                        
Interest rate         4.06%              
Number of properties acquired | property         914              
Number of properties treated as collateral | property         583              
Minimum debt service coverage ratio         1.47              
Ellington portfolio acquisition | Notes Payable                        
Debt Instrument [Line Items]                        
Purchase price         $ 51,600,000              
Revolving Credit Facility | Credit Agreement                        
Debt Instrument [Line Items]                        
Debt instrument, face amount                     $ 1,000,000,000  
Encumbered Properties                        
Debt Instrument [Line Items]                        
Number of properties | property                   18,334 22,146  
Single-family properties                   $ 2,701,311,000 $ 3,375,208,000  
Single family homes                        
Debt Instrument [Line Items]                        
Number of properties | single_family_property                   51,239 48,422  
Single-family properties                   $ 8,064,980,000 $ 7,547,856,000  
Number of properties sold | property                   923 712  
Secured Debt                        
Debt Instrument [Line Items]                        
Total debt                   $ 2,013,357,000 $ 2,491,234,000  
Secured Debt | Notes Payable                        
Debt Instrument [Line Items]                        
Interest rate                   4.06%    
Total debt                   $ 48,859,000 $ 49,828,000  
Secured Debt | Encumbered Properties                        
Debt Instrument [Line Items]                        
Number of properties | property                   572 572  
Single-family properties                   $ 71,868,000 $ 73,780,000  
Line of Credit | Term loan facility, net                        
Debt Instrument [Line Items]                        
Interest rate                   2.91%    
Deferred financing costs, net                   $ 2,000,000 3,300,000  
Total debt                   200,000,000 325,000,000  
Credit facility maximum borrowing capacity                   $ 200,000,000    
Line of Credit | Term loan facility, net | LIBOR                        
Debt Instrument [Line Items]                        
Basis spread on variable rate                   1.35%    
Line of Credit | Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Interest rate                   2.76%    
Number of debt instrument extension options | extension_option                   2    
Total debt                   $ 140,000,000 0  
Credit facility maximum borrowing capacity                   $ 800,000,000    
Line of credit extension period                   6 months    
Line of Credit | Revolving Credit Facility | LIBOR                        
Debt Instrument [Line Items]                        
Basis spread on variable rate                   1.20%    
Line of Credit | Minimum | Term loan facility, net | LIBOR                        
Debt Instrument [Line Items]                        
Basis spread on variable rate                   0.90%    
Line of Credit | Minimum | Term loan facility, net | Base Rate                        
Debt Instrument [Line Items]                        
Basis spread on variable rate                   0.00%    
Line of Credit | Minimum | Revolving Credit Facility | LIBOR                        
Debt Instrument [Line Items]                        
Basis spread on variable rate                   0.825%    
Line of Credit | Minimum | Revolving Credit Facility | Base Rate                        
Debt Instrument [Line Items]                        
Basis spread on variable rate                   0.00%    
Line of Credit | Maximum | Term loan facility, net | LIBOR                        
Debt Instrument [Line Items]                        
Basis spread on variable rate                   1.75%    
Line of Credit | Maximum | Term loan facility, net | Base Rate                        
Debt Instrument [Line Items]                        
Basis spread on variable rate                   0.75%    
Line of Credit | Maximum | Revolving Credit Facility | LIBOR                        
Debt Instrument [Line Items]                        
Basis spread on variable rate                   1.55%    
Line of Credit | Maximum | Revolving Credit Facility | Base Rate                        
Debt Instrument [Line Items]                        
Basis spread on variable rate                   0.55%    
Line of Credit | Special Purpose Entity                        
Debt Instrument [Line Items]                        
Gain (loss) on extinguishment of debt                     (2,700,000)  
Senior notes | 4.25% Senior Notes Due 2028 | Subsequent Events                        
Debt Instrument [Line Items]                        
Debt instrument, face amount   $ 500,000,000                    
Interest rate   4.25%                    
Proceeds from issuance of unsecured debt   $ 494,000,000                    
Underwriting fees   3,200,000                    
Deferred financing costs, net                 $ 1,500,000      
Unamortized discount on debt   $ 2,800,000                    
Convertible Debt | 3.25% Exchangeable Senior Notes                        
Debt Instrument [Line Items]                        
Debt instrument, face amount $ 115,000,000                      
Interest rate 3.25%                 3.25%    
Conversion ratio                   0.0552716    
Debt Instrument, convertible, threshold percentage of stock price trigger 98.00%                      
Debt instrument, convertible, threshold trading days | day 20                      
Debt instrument, convertible, threshold consecutive trading days | day 5                      
Convertible debt $ 112,300,000                      
Debt instrument, unamortized discount 2,700,000                      
Convertible Debt 105,300,000                      
Debt instrument, convertible, carrying amount of equity component $ 7,000,000                      
Fair value inputs, discount rate 6.70%                      
Total debt                   $ 115,000,000 $ 115,000,000  
Convertible Debt | American Residential Properties Inc. | 3.25% Exchangeable Senior Notes                        
Debt Instrument [Line Items]                        
Conversion ratio 0.0469423                      
Conversion ratio, adjusted 0.0532795                      
Business acquisition, equity interest issued or issuable, number of shares, multiplier 1.135                      
Convertible Debt | Minimum | 3.25% Exchangeable Senior Notes                        
Debt Instrument [Line Items]                        
Debt Instrument, convertible, threshold percentage of stock price trigger 130.00%                      
Debt instrument, convertible, threshold consecutive trading days | day 30                      
2014-SFR 1                        
Debt Instrument [Line Items]                        
Loan payoff amount                   $ 455,400,000    
Number of homes pledged as collateral and released | property                   2 2  
Number of properties sold | property                   2 47  
Total release price                   $ 700,000 $ 14,500,000  
Debt instrument term               2 years        
Interest rate cap agreement strike rate               3.85%        
Period of extension options               12 months        
2014-SFR 1 | Special Purpose Entity | Notes Payable                        
Debt Instrument [Line Items]                        
Number of properties | property               3,852        
Debt instrument, face amount               $ 481,000,000        
Number of floating rate loan components | floating_rate_component               6        
2014-SFR 1 | Encumbered Properties                        
Debt Instrument [Line Items]                        
Number of properties | property                   0 3,803  
Single-family properties                   $ 0 $ 575,421,000  
2014-SFR 1 | Single family homes                        
Debt Instrument [Line Items]                        
LIBOR floor rate               0.25%        
Number of debt instrument extension options | extension_option               3        
Proceeds from asset-backed securitizations               $ 481,000,000        
Debt issuance cost               $ 14,900,000        
2014-SFR 1 | Single family homes | LIBOR                        
Debt Instrument [Line Items]                        
Interest margin on reference rate               1.54%        
2014-SFR 1 | Property disqualified from collateral pool | Single family homes                        
Debt Instrument [Line Items]                        
Number of homes pledged as collateral and released | property                   3,799 2,875  
Release of restricted cash collateral for borrowed securities                   $ (9,400,000) $ (10,100,000)  
2014-SFR 1 | Secured Debt | Special Purpose Entity                        
Debt Instrument [Line Items]                        
Gain (loss) on extinguishment of debt                   $ (6,600,000) $ (10,700,000)  
2014-SFR 2                        
Debt Instrument [Line Items]                        
Number of homes pledged as collateral and released | property                   3 3  
Total release price                   $ 400,000 $ 400,000  
2014-SFR 2 | Encumbered Properties                        
Debt Instrument [Line Items]                        
Number of properties | property                   4,481 4,484  
Single-family properties                   $ 627,988,000 $ 650,175,000  
2014-SFR 2 | Single family homes                        
Debt Instrument [Line Items]                        
Loan payoff amount             $ 25,700,000          
Number of properties | property             4,487          
Debt instrument, face amount             $ 513,300,000          
Weighted-average interest rate             4.42%          
Debt instrument term             10 years          
Proceeds from asset-backed securitizations             $ 487,700,000          
Debt issuance cost             $ 12,900,000          
2014-SFR 3                        
Debt Instrument [Line Items]                        
Number of homes pledged as collateral and released | property                   4    
Total release price                   $ 500,000    
2014-SFR 3 | Encumbered Properties                        
Debt Instrument [Line Items]                        
Number of properties | property                   4,499 4,503  
Single-family properties                   $ 680,788,000 $ 706,262,000  
2014-SFR 3 | Single family homes                        
Debt Instrument [Line Items]                        
Number of properties | property           4,503            
Debt instrument, face amount           $ 528,400,000            
Weighted-average interest rate           4.40%            
Debt instrument term           10 years            
Debt issuance cost           $ 12,900,000            
2015-SFR 1                        
Debt Instrument [Line Items]                        
Number of homes pledged as collateral and released | property                   2 1  
Total release price                   $ 200,000 $ 100,000  
2015-SFR 1 | Special Purpose Entity                        
Debt Instrument [Line Items]                        
Debt instrument, face amount       $ 552,800,000                
Weighted-average interest rate       4.14%                
Debt instrument term       30 years                
2015-SFR 1 | Special Purpose Entity | Notes Payable                        
Debt Instrument [Line Items]                        
Number of properties | property       4,661                
2015-SFR 1 | Encumbered Properties                        
Debt Instrument [Line Items]                        
Number of properties | property                   4,658 4,660  
Single-family properties                   $ 685,055,000 $ 710,778,000  
2015-SFR 1 | Single family homes                        
Debt Instrument [Line Items]                        
Proceeds from asset-backed securitizations       $ 552,800,000                
Debt issuance cost       $ 13,300,000                
2015-SFR 2                        
Debt Instrument [Line Items]                        
Number of homes pledged as collateral and released | property                     1  
Total release price                     $ 100,000  
2015-SFR 2 | Special Purpose Entity                        
Debt Instrument [Line Items]                        
Debt instrument, face amount     $ 477,700,000                  
Weighted-average interest rate     4.36%                  
Debt instrument term     30 years                  
Proceeds from asset-backed securitizations     $ 477,700,000                  
Debt issuance cost     $ 11,300,000                  
2015-SFR 2 | Encumbered Properties                        
Debt Instrument [Line Items]                        
Number of properties | property                   4,124 4,124  
Single-family properties                   $ 635,612,000 $ 658,792,000  
2015-SFR 2 | Single family homes | Special Purpose Entity                        
Debt Instrument [Line Items]                        
Number of properties | single_family_property     4,125