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Debt - Narrative (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Jun. 30, 2017
USD ($)
Sep. 30, 2015
USD ($)
singleFamilyProperty
Mar. 31, 2015
USD ($)
property
Dec. 31, 2014
USD ($)
property
Sep. 30, 2014
USD ($)
property
Dec. 31, 2020
USD ($)
debtInstrumentExtensionOptions
singleFamilyProperty
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
property
Debt Instrument [Line Items]                    
Loan payoff amount               $ 22,501,000 $ 21,517,000 $ 20,847,000
Gain (loss) on extinguishment of debt               $ 0 (659,000) (1,447,000)
Minimum coverage ratio               1.20    
Proceeds from unsecured senior notes, net of discount               $ 0 397,944,000 497,210,000
Deferred financing costs, net               27,422,000 33,353,000  
Debt outstanding               2,848,492,000 2,870,993,000  
Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Payments on credit facility               $ 130,000,000 250,000,000 295,000,000
Designated as Hedging Instrument | Treasury Lock                    
Debt Instrument [Line Items]                    
Derivative interest rate   4.08%                
Single Family Homes                    
Debt Instrument [Line Items]                    
Number of properties | singleFamilyProperty               53,584    
Asset Backed Securitizations September 2014 Securitization | Single Family Homes                    
Debt Instrument [Line Items]                    
Loan payoff amount             $ 25,700,000      
Debt instrument, face amount             $ 513,300,000      
Debt instrument term             10 years      
Weighted-average interest rate             4.42%      
Number of properties | property             4,487      
Proceeds from asset-backed securitizations             $ 487,700,000      
Debt issuance cost             $ 12,900,000      
Asset Backed Securitizations November 2014 Securitization | Single Family Homes                    
Debt Instrument [Line Items]                    
Debt instrument, face amount           $ 528,400,000        
Debt instrument term           10 years        
Weighted-average interest rate           4.40%        
Number of properties | property           4,503        
Proceeds from asset-backed securitizations           $ 528,400,000        
Debt issuance cost           $ 12,900,000        
Asset Backed Securitizations March 2015 Securitization | Single Family Homes                    
Debt Instrument [Line Items]                    
Debt instrument, face amount         $ 552,800,000          
Debt instrument term         30 years          
Weighted-average interest rate         4.14%          
Number of properties | property         4,661          
Proceeds from asset-backed securitizations         $ 552,800,000          
Debt issuance cost         $ 13,300,000          
Asset Backed Securitizations September 2015 Securitization | Single Family Homes                    
Debt Instrument [Line Items]                    
Debt instrument, face amount       $ 477,700,000            
Debt instrument term       30 years            
Weighted-average interest rate       4.36%            
Number of properties | singleFamilyProperty       4,125            
Proceeds from asset-backed securitizations       $ 477,700,000            
Debt issuance cost       $ 11,300,000            
Term loan facility, net                    
Debt Instrument [Line Items]                    
Payments on credit facility               $ 0 100,000,000 100,000,000
Credit Agreement                    
Debt Instrument [Line Items]                    
Debt instrument, accordion feature, higher borrowing capacity option               1,750,000,000    
Credit Agreement | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Debt instrument, face amount     $ 1,000,000,000.0              
Secured Debt                    
Debt Instrument [Line Items]                    
Debt outstanding               $ 1,948,492,000 1,970,993,000  
Secured Debt | Notes Payable                    
Debt Instrument [Line Items]                    
Loan payoff amount                   48,400,000
Gain (loss) on extinguishment of debt                   $ (500,000)
Number of homes pledged as collateral and released | property                   572
Release of restricted cash collateral for borrowed securities                   $ 2,100,000
Line of Credit | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Interest rate               1.34%    
Credit facility maximum borrowing capacity     $ 800,000,000.0              
Commitment fee               0.25%    
Number of debt instrument extension options | debtInstrumentExtensionOptions               2    
Line of credit extension period               6 months    
Debt outstanding               $ 0 0  
Line of Credit | Revolving Credit Facility | LIBOR                    
Debt Instrument [Line Items]                    
Basis spread on variable rate               1.20%    
Line of Credit | Revolving Credit Facility | Minimum | LIBOR                    
Debt Instrument [Line Items]                    
Basis spread on variable rate     0.825%              
Line of Credit | Revolving Credit Facility | Minimum | Base Rate                    
Debt Instrument [Line Items]                    
Basis spread on variable rate     0.00%              
Line of Credit | Revolving Credit Facility | Maximum | LIBOR                    
Debt Instrument [Line Items]                    
Basis spread on variable rate     1.55%              
Line of Credit | Revolving Credit Facility | Maximum | Base Rate                    
Debt Instrument [Line Items]                    
Basis spread on variable rate     0.55%              
Line of Credit | Term loan facility, net                    
Debt Instrument [Line Items]                    
Payments on credit facility                 100,000,000.0 100,000,000.0
Write off of deferred debt issuance costs                 700,000 $ 900,000
Line of Credit | Term Loan Facility                    
Debt Instrument [Line Items]                    
Debt instrument, face amount     $ 200,000,000.0              
Senior notes | 4.25% Senior Notes Due 2028                    
Debt Instrument [Line Items]                    
Debt instrument, face amount   $ 500,000,000.0                
Interest rate   4.25%           4.25%    
Proceeds from unsecured senior notes, net of discount   $ 494,000,000.0                
Underwriting fees   3,200,000                
Unamortized discount on debt   2,800,000                
Deferred financing costs, net   $ 1,900,000                
Redeemable percentage of debt   100.00%                
Debt outstanding               $ 500,000,000 500,000,000  
Senior notes | 4.90 Percent Senior Notes Due 2029                    
Debt Instrument [Line Items]                    
Debt instrument, face amount $ 400,000,000.0                  
Interest rate 4.90%             4.90%    
Proceeds from unsecured senior notes, net of discount $ 395,300,000                  
Underwriting fees 2,600,000                  
Unamortized discount on debt 2,100,000                  
Deferred financing costs, net $ 1,000,000.0                  
Redeemable percentage of debt 100.00%                  
Debt outstanding               $ 400,000,000 $ 400,000,000