Fair Value - Carrying Value and Fair Value (Details) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Dec. 31, 2018	Oct. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Deferred financing costs, net	$ 36,332,000			$ 36,332,000	$ 36,421,000
Gain on derivative recorded in other comprehensive income				9,600,000
Estimated amount of existing gains to be reclassified in the next 12 months	1,000,000.0			1,000,000.0
Redemptions of Class A units	0	$ 0	$ (28,258,000)
Treasury Lock | Designated as Hedging Instrument
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative, notional amount						$ 350,000,000.0
Accumulated deficit
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Redemptions of Class A units			$ 32,215,000
Asset-backed securitization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Deferred financing costs, net					31,000,000.0
Term Loan facility | Line of Credit
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Deferred financing costs, net					800,000
Unsecured Senior Notes
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Deferred financing costs, net					4,700,000
Carrying Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization	1,953,280,000			1,953,280,000	1,961,511,000
Unsecured senior notes, net	887,777,000			887,777,000	492,800,000
Revolving credit facility	0			0	250,000,000
Term loan facility	0			0	99,232,000
Total debt	2,841,057,000			2,841,057,000	2,803,543,000
Carrying Value | 2014-SFR 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization	481,749,000			481,749,000	483,790,000
Carrying Value | 2014-SFR 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization	497,106,000			497,106,000	499,108,000
Carrying Value | 2015-SFR 1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization	521,771,000			521,771,000	523,865,000
Carrying Value | 2015-SFR 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization	452,654,000			452,654,000	454,748,000
Carrying Value | 4.25% Senior Notes Due 2028
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unsecured senior notes, net	493,195,000			493,195,000	492,800,000
Carrying Value | 4.90% Senior Notes Due 2029
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unsecured senior notes, net	394,582,000			394,582,000	0
Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization	2,009,790,000			2,009,790,000	2,008,239,000
Unsecured senior notes, net	952,368,000			952,368,000	479,730,000
Revolving credit facility	0			0	250,000,000
Term loan facility	0			0	100,000,000
Total debt	2,962,158,000			2,962,158,000	2,837,969,000
Fair Value | 2014-SFR 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization	493,762,000			493,762,000	494,820,000
Fair Value | 2014-SFR 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization	512,386,000			512,386,000	511,450,000
Fair Value | 2015-SFR 1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization	535,892,000			535,892,000	534,666,000
Fair Value | 2015-SFR 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization	467,750,000			467,750,000	467,303,000
Fair Value | 4.25% Senior Notes Due 2028
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unsecured senior notes, net	517,880,000			517,880,000	479,730,000
Fair Value | 4.90% Senior Notes Due 2029
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unsecured senior notes, net	$ 434,488,000			$ 434,488,000	$ 0