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Fair Value - Carrying Value and Fair Value (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Oct. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Deferred financing costs, net   $ 38,026   $ 51,636
Scenario, Forecast        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative gain (loss) $ 9,600      
Designated as Hedging Instrument | Treasury Lock        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative, notional amount     $ 350,000  
Treasury lock     $ 100  
Credit facility | LIBOR | Line of Credit        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Basis spread on variable rate   1.20%    
Credit facility | LIBOR | Minimum | Line of Credit        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Basis spread on variable rate   0.825%    
Credit facility | LIBOR | Maximum | Line of Credit        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Basis spread on variable rate   1.55%    
Credit facility | Base Rate | Minimum | Line of Credit        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Basis spread on variable rate   0.00%    
Credit facility | Base Rate | Maximum | Line of Credit        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Basis spread on variable rate   0.55%    
Asset-backed securitization        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Deferred financing costs, net   $ 36,000   48,400
Term loan facility, net | Line of Credit        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Deferred financing costs, net   $ 2,000   3,300
Term loan facility, net | LIBOR | Line of Credit        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Basis spread on variable rate   1.35%    
Term loan facility, net | LIBOR | Minimum | Line of Credit        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Basis spread on variable rate   0.90%    
Term loan facility, net | LIBOR | Maximum | Line of Credit        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Basis spread on variable rate   1.75%    
Term loan facility, net | Base Rate | Minimum | Line of Credit        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Basis spread on variable rate   0.00%    
Term loan facility, net | Base Rate | Maximum | Line of Credit        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Basis spread on variable rate   0.75%    
Carrying Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset-backed securitization   $ 2,013,357   2,491,234
Convertible debt   111,697   108,148
Secured notes payable   48,859   49,828
Revolving credit facilities   140,000   0
Term loan facility   200,000   325,000
Total debt   2,513,913   2,974,210
Carrying Value | 2014-SFR 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset-backed securitization   0   456,074
Carrying Value | 2014-SFR 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset-backed securitization   496,326   501,810
Carrying Value | 2014-SFR 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset-backed securitization   512,041   517,827
Carrying Value | 2015-SFR 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset-backed securitization   537,723   543,480
Carrying Value | 2015-SFR 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset-backed securitization   467,267   472,043
Fair Value | Significant Unobservable Inputs (Level 3)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset-backed securitization   2,046,406   2,544,423
Convertible debt   147,462   142,808
Secured notes payable   49,027   50,053
Revolving credit facilities   140,000   0
Term loan facility   200,000   325,000
Total debt   2,582,895   3,062,284
Fair Value | 2014-SFR 1 | Significant Unobservable Inputs (Level 3)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset-backed securitization   0   465,343
Fair Value | 2014-SFR 2 | Significant Unobservable Inputs (Level 3)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset-backed securitization   504,730   510,941
Fair Value | 2014-SFR 3 | Significant Unobservable Inputs (Level 3)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset-backed securitization   521,252   530,549
Fair Value | 2015-SFR 1 | Significant Unobservable Inputs (Level 3)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset-backed securitization   544,592   553,689
Fair Value | 2015-SFR 2 | Significant Unobservable Inputs (Level 3)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset-backed securitization   $ 475,832   $ 483,901