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Fair Value - Carrying Value and Fair Value (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Designated as Hedging Instrument | Treasury Lock
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative, notional amount	$ 400,000
Term of contract	10 years
Derivative, fair value		$ 4,000
Carrying Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization		1,917,833	$ 1,927,607
Unsecured senior notes, net		890,481	889,805
Revolving credit facility		620,000	0
Total debt		3,428,314	2,817,412
Carrying Value | 2014-SFR 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization		472,610	475,144
Carrying Value | 2014-SFR 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization		487,774	490,319
Carrying Value | 2015-SFR 1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization		512,778	515,326
Carrying Value | 2015-SFR 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization		444,671	446,818
Carrying Value | 2028 unsecured senior notes, net
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unsecured senior notes, net		494,773	494,378
Carrying Value | 2029 unsecured senior notes, net
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unsecured senior notes, net		395,708	395,427
Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization		1,968,165	1,983,083
Unsecured senior notes, net		1,027,152	1,057,496
Revolving credit facility		620,000	0
Total debt		3,615,317	3,040,579
Fair Value | 2014-SFR 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization		483,541	488,140
Fair Value | 2014-SFR 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization		500,415	504,364
Fair Value | 2015-SFR 1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization		525,461	529,542
Fair Value | 2015-SFR 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization		458,748	461,037
Fair Value | 2028 unsecured senior notes, net
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unsecured senior notes, net		561,940	575,220
Fair Value | 2029 unsecured senior notes, net
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unsecured senior notes, net		$ 465,212	$ 482,276

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