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Debt - Narrative (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 29, 2016 | Feb. 28, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) property | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) property | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Payments on asset-backed securitizations |  |  |  |  |  |  | $ 15,669,000 | $ 472,470,000 |
Gain (loss) on early extinguishment of debt |  |  | $ 0 |  | $ 0 |  | (1,447,000) | (6,555,000) |
Deferred financing costs, net |  |  | 37,876,000 |  |  |  | 37,876,000 |  | $ 38,026,000
Asset Backed Securitizations May 2014 Securitization |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Payments on asset-backed securitizations |  |  |  |  |  | $ 455,400,000 |  |  |
Asset Backed Securitizations May 2014 Securitization | Property disqualified from collateral pool | Single Family Homes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Number of properties released | property |  |  |  |  |  | 3,799 |  |  |
Increase (decrease) in cash collateral for borrowed securities |  |  |  |  |  | $ (9,400,000) |  |  |
Secured Debt | Asset Backed Securitizations May 2014 Securitization | Special Purpose Entity |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Gain (loss) on early extinguishment of debt |  |  |  |  |  |  |  | (6,555,000) |
Secured Note Payable | Secured Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Payments on asset-backed securitizations |  |  |  | $ 48,400,000 |  |  |  |  |
Gain (loss) on early extinguishment of debt |  |  |  | $ (500,000) |  |  |  |  |
Number of properties released | property |  |  |  | 572 |  |  |  |  |
Increase (decrease) in cash collateral for borrowed securities |  |  |  | $ (2,100,000) |  |  |  |  |
Term loan facility, net |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Payments on credit facility |  |  |  |  |  |  | 100,000,000 | $ 100,000,000 |
Term loan facility, net | Line of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Payments on credit facility |  |  |  | 100,000,000 |  |  |  |  |
Write off of unamortized deferred financing costs |  |  |  | $ 900,000 |  |  |  |  |
Deferred financing costs, net |  |  | $ 800,000 |  |  |  | $ 800,000 |  | $ 2,000,000
Effective interest rate |  |  | 3.61% |  |  |  | 3.61% |  |
4.25% Senior Notes Due 2028 | Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument face amount |  | $ 500,000,000 |  |  |  |  |  |  |
Interest Rate |  | 4.25% | 4.25% |  |  |  | 4.25% |  |
Net proceeds from debt issuance |  | $ 494,000,000 |  |  |  |  |  |  |
Underwriting fees |  | 3,200,000 |  |  |  |  |  |  |
Unamortized discount |  | 2,800,000 |  |  |  |  |  |  |
Deferred financing costs, net |  | $ 1,900,000 |  |  |  |  |  |  |
Effective interest rate |  |  | 4.08% |  |  |  | 4.08% |  |
3.25% Exchangeable Senior Notes | Convertible Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest Rate |  |  | 3.25% |  |  |  | 3.25% |  |
Convertible debt conversion ratio |  |  |  |  |  |  | 0.0556688 |  |
3.25% Exchangeable Senior Notes | Convertible Debt | American Residential Properties Inc. |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Convertible debt conversion ratio | 0.0469423 |  |  |  |  |  |  |  |
Convertible debt conversion ratio adjustment | 0.0532795 |  |  |  |  |  |  |  |
Equity interest issued, number of shares, multiplier |  |  | 1.135 |  |  |  | 1.135 |  |

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