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Debt - Narrative (Details)			1 Months Ended							3 Months Ended		12 Months Ended
	Nov. 15, 2018 USD ($)	Feb. 29, 2016 USD ($) day	Feb. 28, 2018 USD ($)	Sep. 30, 2015 USD ($) single_family_property	Mar. 31, 2015 USD ($) property	Dec. 31, 2014 USD ($) property	Nov. 30, 2014 USD ($) property	Sep. 30, 2014 USD ($) property	May 31, 2014 USD ($) floating_rate_component property extension_option	Jun. 30, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) single_family_property property extension_option	Dec. 31, 2017 USD ($) single_family_property property	Dec. 31, 2016 USD ($) property	Jun. 30, 2017 USD ($)
Debt Instrument [Line Items]
Loan payoff amount												$ 20,847,000	$ 477,879,000	$ 381,117,000
Gain (loss) on extinguishment of debt												(1,447,000)	(6,555,000)	(13,408,000)
Single-family properties												8,020,597,000	8,029,177,000
Proceeds from unsecured senior notes, net of discount												497,210,000	0	0
Deferred financing costs, net												$ 36,421,000	38,026,000
Minimum coverage ratio												1.20
Debt instrument, unamortized discount												$ 2,546,000	895,000
Exchangeable senior notes, net												0	111,697,000
Debt instrument, convertible, carrying amount of equity component												0	2,408,000
Payments on secured note payable												49,427,000	969,000	924,000
Total debt												2,842,510,000	2,517,216,000
Designated as Hedging Instrument | Treasury Lock
Debt Instrument [Line Items]
Derivative interest rate			4.08%
Revolving Credit Facility
Debt Instrument [Line Items]
Payments on credit facility												295,000,000	112,000,000	$ 951,000,000
Deferred financing costs, net												$ 6,900,000	$ 8,800,000
American Residential Properties Inc.
Debt Instrument [Line Items]
Purchase price		$ 1,322,461,000
Ellington Portfolio Acquisition
Debt Instrument [Line Items]
Interest rate						4.06%
Number of properties acquired | property						914
Number of properties treated as collateral | property						583
Minimum debt service coverage ratio						1.47
Single family homes
Debt Instrument [Line Items]
Number of properties | single_family_property												52,783	51,239
Encumbered Properties
Debt Instrument [Line Items]
Number of properties | property												18,009	18,334
Single-family properties												$ 2,548,384,000	$ 2,701,311,000
2014-SFR 1
Debt Instrument [Line Items]
Loan payoff amount													$ 455,400,000
Debt instrument term									2 years
Interest rate cap agreement strike rate									3.85%
Period of extension options									12 months
2014-SFR 1 | Single family homes
Debt Instrument [Line Items]
LIBOR floor rate									0.25%
Number of debt instrument extension options | extension_option									3
Proceeds from asset-backed securitizations									$ 481,000,000
Debt issuance cost									$ 14,900,000
2014-SFR 1 | Single family homes | LIBOR
Debt Instrument [Line Items]
Interest margin on reference rate									1.54%
2014-SFR 1 | Property disqualified from collateral pool | Single family homes
Debt Instrument [Line Items]
Number of homes pledged as collateral and released | property													3,799	2,875
Release of restricted cash collateral for borrowed securities											$ (9,400,000)			$ (10,100,000)
2014-SFR 2
Debt Instrument [Line Items]
Number of homes pledged as collateral and released | property												0	3
Collateral, number of properties substituted | property												65	0
Total release price												$ 0	$ 400,000
2014-SFR 2 | Single family homes
Debt Instrument [Line Items]
Loan payoff amount								$ 25,700,000
Number of properties | property								4,487
Debt instrument, face amount								$ 513,300,000
Debt instrument term								10 years
Proceeds from asset-backed securitizations								$ 487,700,000
Debt issuance cost								$ 12,900,000
Weighted-average interest rate								4.42%
2014-SFR 2 | Encumbered Properties
Debt Instrument [Line Items]
Number of properties | property												4,546	4,481
Single-family properties												$ 611,279,000	$ 627,988,000
2014-SFR 3
Debt Instrument [Line Items]
Number of homes pledged as collateral and released | property												0	4
Collateral, number of properties substituted | property												89	0
Total release price												$ 0	$ 500,000
2014-SFR 3 | Single family homes
Debt Instrument [Line Items]
Number of properties | property							4,503
Debt instrument, face amount							$ 528,400,000
Debt instrument term							10 years
Debt issuance cost							$ 12,900,000
Weighted-average interest rate							4.40%
2014-SFR 3 | Encumbered Properties
Debt Instrument [Line Items]
Number of properties | property												4,588	4,499
Single-family properties												$ 662,068,000	$ 680,788,000
2015-SFR 1
Debt Instrument [Line Items]
Number of homes pledged as collateral and released | property												0	2
Collateral, number of properties substituted | property												39	0
Total release price												$ 0	$ 200,000
2015-SFR 1 | Special Purpose Entity
Debt Instrument [Line Items]
Debt instrument, face amount					$ 552,800,000
Debt instrument term					30 years
Weighted-average interest rate					4.14%
2015-SFR 1 | Single family homes
Debt Instrument [Line Items]
Proceeds from asset-backed securitizations					$ 552,800,000
Debt issuance cost					$ 13,300,000
2015-SFR 1 | Encumbered Properties
Debt Instrument [Line Items]
Number of properties | property												4,697	4,658
Single-family properties												$ 662,202,000	$ 685,055,000
2015-SFR 2
Debt Instrument [Line Items]
Number of homes pledged as collateral and released | property												1
Collateral, number of properties substituted | property												55
Total release price												$ 100,000
2015-SFR 2 | Special Purpose Entity
Debt Instrument [Line Items]
Debt instrument, face amount				$ 477,700,000
Debt instrument term				30 years
Proceeds from asset-backed securitizations				$ 477,700,000
Debt issuance cost				$ 11,300,000
Weighted-average interest rate				4.36%
2015-SFR 2 | Single family homes | Special Purpose Entity
Debt Instrument [Line Items]
Number of properties | single_family_property				4,125
2015-SFR 2 | Encumbered Properties
Debt Instrument [Line Items]
Number of properties | property												4,178	4,124
Single-family properties												$ 612,835,000	$ 635,612,000
Notes Payable | Ellington Portfolio Acquisition
Debt Instrument [Line Items]
Purchase price						$ 51,600,000
Notes Payable | 2014-SFR 1 | Special Purpose Entity
Debt Instrument [Line Items]
Number of properties | property									3,852
Debt instrument, face amount									$ 481,000,000
Number of floating rate loan components | floating_rate_component									6
Notes Payable | 2015-SFR 1 | Special Purpose Entity
Debt Instrument [Line Items]
Number of properties | property					4,661
Term loan facility, net
Debt Instrument [Line Items]
Payments on credit facility												100,000,000	100,000,000	0
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
Secured Debt
Debt Instrument [Line Items]
Total debt												$ 1,992,510,000	$ 2,013,357,000
Secured Debt | Encumbered Properties
Debt Instrument [Line Items]
Number of properties | property												0	572
Single-family properties												$ 0	$ 71,868,000
Secured Debt | 2014-SFR 1 | Special Purpose Entity
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt											$ (6,600,000)			(10,700,000)
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)
Payments on secured note payable										$ 48,400,000
Total debt												$ 0	48,859,000
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Number of debt instrument extension options | extension_option												2
Credit facility maximum borrowing capacity												$ 200,000,000.0			$ 800,000,000
Line of credit extension period												6 months
Total debt												$ 250,000,000	140,000,000
Line of Credit | Revolving Credit Facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate												1.20%
Line of Credit | Minimum | Revolving Credit Facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate												0.825%
Line of Credit | Minimum | Revolving Credit Facility | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate												0.00%
Line of Credit | Maximum | Revolving Credit Facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate												1.55%
Line of Credit | Maximum | Revolving Credit Facility | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate												0.55%
Line of Credit | Special Purpose Entity
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt														$ (2,700,000)
Line of Credit | Term loan facility, net
Debt Instrument [Line Items]
Payments on credit facility												$ 100,000,000
Write off of deferred debt issuance costs												900,000
Deferred financing costs, net												800,000	2,000,000
Total debt												$ 100,000,000	200,000,000
Line of Credit | Term loan facility, net | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate												1.35%
Line of Credit | Term loan facility, net | Minimum | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate												0.90%
Line of Credit | Term loan facility, net | Minimum | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate												0.00%
Line of Credit | Term loan facility, net | Maximum | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate												1.75%
Line of Credit | Term loan facility, net | Maximum | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate												0.75%
Senior notes | 4.25% Senior Notes Due 2028
Debt Instrument [Line Items]
Debt instrument, face amount			$ 500,000,000
Interest rate			4.25%									4.25%
Proceeds from unsecured senior notes, net of discount			$ 494,000,000
Underwriting fees			3,200,000
Unamortized discount on debt			2,800,000
Deferred financing costs, net			$ 1,900,000
Total debt												$ 500,000,000	0
Convertible Debt
Debt Instrument [Line Items]
Settlement of exchangeable senior notes, aggregate payment	$ 135,100,000
Measurement period for exchange values	40 days
Measurement period prior to maturity	42 days
Fair value of liability component immediately prior to extinguishment	$ 115,000,000
Settlement consideration allocated to reacquisition of equity component	$ 20,100,000
Convertible Debt | 3.25% Exchangeable Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount		$ 115,000,000
Interest rate		3.25%
Conversion ratio												0.0556688
Debt Instrument, convertible, threshold percentage of stock price trigger		98.00%
Debt instrument, convertible, threshold trading days | day		20
Debt instrument, convertible, threshold consecutive trading days | day		5
Convertible debt		$ 112,300,000
Debt instrument, unamortized discount		2,700,000
Exchangeable senior notes, net		105,300,000
Debt instrument, convertible, carrying amount of equity component		$ 7,000,000
Total debt												$ 0	$ 115,000,000
Convertible Debt | 3.25% Exchangeable Senior Notes | Discount Rate
Debt Instrument [Line Items]
Fair value inputs, discount rate		0.067
Convertible Debt | 3.25% Exchangeable Senior Notes | Minimum
Debt Instrument [Line Items]
Debt Instrument, convertible, threshold percentage of stock price trigger		130.00%
Debt instrument, convertible, threshold consecutive trading days | day		30
Convertible Debt | 3.25% Exchangeable Senior Notes | American Residential Properties Inc.
Debt Instrument [Line Items]
Conversion ratio		0.0469423
Conversion ratio, adjusted		0.0532795
Business acquisition, equity interest issued or issuable, number of shares, multiplier		1.135

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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