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Debt - Narrative (Details) |  | 1 Months Ended | 2 Months Ended | 12 Months Ended
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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 ($) property | May 31, 2014 USD ($) extension_option floating_rate_component property | Feb. 23, 2018 USD ($) property | Dec. 31, 2017 USD ($) extension_option single_family_property property | Dec. 31, 2016 USD ($) single_family_property property | Dec. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loan payoff amount |  |  |  |  |  |  |  |  |  | $ 477,879,000 | $ 381,117,000 | $ 19,739,000
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  |  | (6,555,000) | (13,408,000) | 0
Single-family properties |  |  |  |  |  |  |  |  |  | 8,064,980,000 | 7,547,856,000 |
Deferred financing costs, net |  |  |  |  |  |  |  |  |  | 38,026,000 | 51,636,000 |
Payments of debt issuance costs |  |  |  |  |  |  |  |  |  | $ 3,974,000 | 10,476,000 | 25,335,000
Percentage portion of principal amount for which monthly payment is required |  |  |  |  |  |  |  |  |  | 0.083% |  |
Minimum coverage ratio |  |  |  |  |  |  |  |  |  | 1.20 |  |
Proceeds from asset-backed securitizations |  |  |  |  |  |  |  |  |  | $ 0 | 0 | $ 1,030,559,000
Debt instrument, unamortized discount |  |  |  |  |  |  |  |  |  | 895,000 | 1,883,000 |
Convertible Debt |  |  |  |  |  |  |  |  |  | 111,697,000 | 108,148,000 |
Debt instrument, convertible, carrying amount of equity component |  |  |  |  |  |  |  |  |  | 2,408,000 | 4,969,000 |
Convertible notes payable, noncurrent |  |  |  |  |  |  |  |  |  | 111,700,000 |  |
Total debt |  |  |  |  |  |  |  |  |  | 2,517,216,000 | 2,981,062,000 |
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  |  |  |  |  |  | 550 |  |  |
Subsequent Events | Designated as Hedging Instrument | Treasury Lock |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative interest rate |  |  |  |  |  |  |  |  | 4.08% |  |  |
Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, accordion feature, higher borrowing capacity option |  |  |  |  |  |  |  |  |  | $ 1,750,000,000 |  |
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 |  |  |  |  |  |  |
Ellington portfolio acquisition | Notes Payable |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  | $ 51,600,000 |  |  |  |  |  |  |
Revolving Credit Facility | Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |
Encumbered Properties |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties | property |  |  |  |  |  |  |  |  |  | 18,334 | 22,146 |
Single-family properties |  |  |  |  |  |  |  |  |  | $ 2,701,311,000 | $ 3,375,208,000 |
Single family homes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties | single_family_property |  |  |  |  |  |  |  |  |  | 51,239 | 48,422 |
Single-family properties |  |  |  |  |  |  |  |  |  | $ 8,064,980,000 | $ 7,547,856,000 |
Number of properties sold | property |  |  |  |  |  |  |  |  |  | 923 | 712 |
Secured Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  |  | $ 2,013,357,000 | $ 2,491,234,000 |
Secured Debt | Notes Payable |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  | 4.06% |  |
Total debt |  |  |  |  |  |  |  |  |  | $ 48,859,000 | $ 49,828,000 |
Secured Debt | Encumbered Properties |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties | property |  |  |  |  |  |  |  |  |  | 572 | 572 |
Single-family properties |  |  |  |  |  |  |  |  |  | $ 71,868,000 | $ 73,780,000 |
Line of Credit | Term loan facility, net |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  | 2.91% |  |
Deferred financing costs, net |  |  |  |  |  |  |  |  |  | $ 2,000,000 | 3,300,000 |
Total debt |  |  |  |  |  |  |  |  |  | 200,000,000 | 325,000,000 |
Credit facility maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 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 | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  | 2.76% |  |
Number of debt instrument extension options | extension_option |  |  |  |  |  |  |  |  |  | 2 |  |
Total debt |  |  |  |  |  |  |  |  |  | $ 140,000,000 | 0 |
Credit facility maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 800,000,000 |  |
Line of credit extension period |  |  |  |  |  |  |  |  |  | 6 months |  |
Line of Credit | Revolving Credit Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  | 1.20% |  |
Line of Credit | Minimum | Term loan facility, net | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  | 0.90% |  |
Line of Credit | Minimum | Term loan facility, net | Base Rate |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  | 0.00% |  |
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 | Term loan facility, net | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  | 1.75% |  |
Line of Credit | Maximum | Term loan facility, net | Base Rate |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  | 0.75% |  |
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) |
Senior notes | 4.25% Senior Notes Due 2028 | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |
Interest rate |  | 4.25% |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of unsecured debt |  | $ 494,000,000 |  |  |  |  |  |  |  |  |  |
Underwriting fees |  | 3,200,000 |  |  |  |  |  |  |  |  |  |
Deferred financing costs, net |  |  |  |  |  |  |  |  | $ 1,500,000 |  |  |
Unamortized discount on debt |  | $ 2,800,000 |  |  |  |  |  |  |  |  |  |
Convertible Debt | 3.25% Exchangeable Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 115,000,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate | 3.25% |  |  |  |  |  |  |  |  | 3.25% |  |
Conversion ratio |  |  |  |  |  |  |  |  |  | 0.0552716 |  |
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 |  |  |  |  |  |  |  |  |  |  |
Convertible Debt | 105,300,000 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible, carrying amount of equity component | $ 7,000,000 |  |  |  |  |  |  |  |  |  |  |
Fair value inputs, discount rate | 6.70% |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  |  | $ 115,000,000 | $ 115,000,000 |
Convertible Debt | American Residential Properties Inc. | 3.25% Exchangeable Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
Convertible Debt | Minimum | 3.25% Exchangeable Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, convertible, threshold percentage of stock price trigger | 130.00% |  |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible, threshold consecutive trading days | day | 30 |  |  |  |  |  |  |  |  |  |  |
2014-SFR 1 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loan payoff amount |  |  |  |  |  |  |  |  |  | $ 455,400,000 |  |
Number of homes pledged as collateral and released | property |  |  |  |  |  |  |  |  |  | 2 | 2 |
Number of properties sold | property |  |  |  |  |  |  |  |  |  | 2 | 47 |
Total release price |  |  |  |  |  |  |  |  |  | $ 700,000 | $ 14,500,000 |
Debt instrument term |  |  |  |  |  |  |  | 2 years |  |  |  |
Interest rate cap agreement strike rate |  |  |  |  |  |  |  | 3.85% |  |  |  |
Period of extension options |  |  |  |  |  |  |  | 12 months |  |  |  |
2014-SFR 1 | Special Purpose Entity | Notes Payable |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |
2014-SFR 1 | Encumbered Properties |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties | property |  |  |  |  |  |  |  |  |  | 0 | 3,803 |
Single-family properties |  |  |  |  |  |  |  |  |  | $ 0 | $ 575,421,000 |
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 1 | Secured Debt | Special Purpose Entity |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  |  | $ (6,600,000) | $ (10,700,000) |
2014-SFR 2 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of homes pledged as collateral and released | property |  |  |  |  |  |  |  |  |  | 3 | 3 |
Total release price |  |  |  |  |  |  |  |  |  | $ 400,000 | $ 400,000 |
2014-SFR 2 | Encumbered Properties |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties | property |  |  |  |  |  |  |  |  |  | 4,481 | 4,484 |
Single-family properties |  |  |  |  |  |  |  |  |  | $ 627,988,000 | $ 650,175,000 |
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 |  |  |  |  |
Weighted-average interest rate |  |  |  |  |  |  | 4.42% |  |  |  |  |
Debt instrument term |  |  |  |  |  |  | 10 years |  |  |  |  |
Proceeds from asset-backed securitizations |  |  |  |  |  |  | $ 487,700,000 |  |  |  |  |
Debt issuance cost |  |  |  |  |  |  | $ 12,900,000 |  |  |  |  |
2014-SFR 3 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of homes pledged as collateral and released | property |  |  |  |  |  |  |  |  |  | 4 |  |
Total release price |  |  |  |  |  |  |  |  |  | $ 500,000 |  |
2014-SFR 3 | Encumbered Properties |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties | property |  |  |  |  |  |  |  |  |  | 4,499 | 4,503 |
Single-family properties |  |  |  |  |  |  |  |  |  | $ 680,788,000 | $ 706,262,000 |
2014-SFR 3 | Single family homes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties | property |  |  |  |  |  | 4,503 |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 528,400,000 |  |  |  |  |  |
Weighted-average interest rate |  |  |  |  |  | 4.40% |  |  |  |  |  |
Debt instrument term |  |  |  |  |  | 10 years |  |  |  |  |  |
Debt issuance cost |  |  |  |  |  | $ 12,900,000 |  |  |  |  |  |
2015-SFR 1 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of homes pledged as collateral and released | property |  |  |  |  |  |  |  |  |  | 2 | 1 |
Total release price |  |  |  |  |  |  |  |  |  | $ 200,000 | $ 100,000 |
2015-SFR 1 | Special Purpose Entity |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 552,800,000 |  |  |  |  |  |  |  |
Weighted-average interest rate |  |  |  | 4.14% |  |  |  |  |  |  |  |
Debt instrument term |  |  |  | 30 years |  |  |  |  |  |  |  |
2015-SFR 1 | Special Purpose Entity | Notes Payable |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties | property |  |  |  | 4,661 |  |  |  |  |  |  |  |
2015-SFR 1 | Encumbered Properties |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties | property |  |  |  |  |  |  |  |  |  | 4,658 | 4,660 |
Single-family properties |  |  |  |  |  |  |  |  |  | $ 685,055,000 | $ 710,778,000 |
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 2 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of homes pledged as collateral and released | property |  |  |  |  |  |  |  |  |  |  | 1 |
Total release price |  |  |  |  |  |  |  |  |  |  | $ 100,000 |
2015-SFR 2 | Special Purpose Entity |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 477,700,000 |  |  |  |  |  |  |  |  |
Weighted-average interest rate |  |  | 4.36% |  |  |  |  |  |  |  |  |
Debt instrument term |  |  | 30 years |  |  |  |  |  |  |  |  |
Proceeds from asset-backed securitizations |  |  | $ 477,700,000 |  |  |  |  |  |  |  |  |
Debt issuance cost |  |  | $ 11,300,000 |  |  |  |  |  |  |  |  |
2015-SFR 2 | Encumbered Properties |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties | property |  |  |  |  |  |  |  |  |  | 4,124 | 4,124 |
Single-family properties |  |  |  |  |  |  |  |  |  | $ 635,612,000 | $ 658,792,000 |
2015-SFR 2 | Single family homes | Special Purpose Entity |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties | single_family_property |  |  | 4,125 |  |  |  |  |  |  |  |  |

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