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Fair Value - Carrying Value and Fair Value (Details) - USD ($)	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Oct. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Deferred financing costs, net	$ 37,876,000	$ 38,026,000
Gain on derivative recorded in other comprehensive income	9,600,000
Treasury Lock | Designated as Hedging Instrument
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative, notional amount			$ 350,000,000
Revolving Credit Facility
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Deferred financing costs, net	$ 7,400,000	8,800,000
Line of Credit | Revolving Credit Facility | LIBOR | Minimum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt instrument, basis spread on variable rate	0.825%
Line of Credit | Revolving Credit Facility | LIBOR | Maximum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt instrument, basis spread on variable rate	1.55%
Line of Credit | Revolving Credit Facility | Base Rate | Minimum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt instrument, basis spread on variable rate	0.00%
Line of Credit | Revolving Credit Facility | Base Rate | Maximum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt instrument, basis spread on variable rate	0.55%
Significant Other Observable Inputs (Level 2) | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative asset	$ 0	75,000
Asset-backed securitization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Deferred financing costs, net	32,300,000	36,000,000
Term Loan facility | Line of Credit
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Deferred financing costs, net	$ 800,000	2,000,000
Term Loan facility | Line of Credit | LIBOR | Minimum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt instrument, basis spread on variable rate	0.90%
Term Loan facility | Line of Credit | LIBOR | Maximum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt instrument, basis spread on variable rate	1.75%
Term Loan facility | Line of Credit | Base Rate | Minimum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt instrument, basis spread on variable rate	0.00%
Term Loan facility | Line of Credit | Base Rate | Maximum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt instrument, basis spread on variable rate	0.75%
Unsecured Senior Notes
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Deferred financing costs, net	$ 4,800,000	0
Carrying Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization	1,997,688,000	2,013,357,000
Unsecured senior notes, net	497,384,000	0
Exchangeable senior notes, net	114,507,000	111,697,000
Secured note payable	0	48,859,000
Revolving credit facility	0	140,000,000
Term loan facility	100,000,000	200,000,000
Total debt	2,709,579,000	2,513,913,000
Carrying Value | 2014-SFR 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization	492,478,000	496,326,000
Carrying Value | 2014-SFR 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization	508,080,000	512,041,000
Carrying Value | 2015-SFR 1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization	533,578,000	537,723,000
Carrying Value | 2015-SFR 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization	463,552,000	467,267,000
Fair Value | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization	2,024,287,000	2,046,406,000
Unsecured senior notes, net	477,805,000	0
Exchangeable senior notes, net	144,135,000	147,462,000
Secured note payable	0	49,027,000
Revolving credit facility	0	140,000,000
Term loan facility	100,000,000	200,000,000
Total debt	2,746,227,000	2,582,895,000
Fair Value | 2014-SFR 2 | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization	498,510,000	504,730,000
Fair Value | 2014-SFR 3 | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization	516,519,000	521,252,000
Fair Value | 2015-SFR 1 | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization	538,414,000	544,592,000
Fair Value | 2015-SFR 2 | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securitization	$ 470,844,000	$ 475,832,000

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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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-Publisher FASB
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-SubTopic 10
-Section 50
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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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The effective portion of gain reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time.

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