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Debt - Narrative (Details) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Jun. 30, 2017 USD ($) | Sep. 30, 2015 USD ($) singleFamilyProperty | Mar. 31, 2015 USD ($) property | Dec. 31, 2014 USD ($) property | Sep. 30, 2014 USD ($) property | Dec. 31, 2020 USD ($) debtInstrumentExtensionOptions singleFamilyProperty | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) property
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Loan payoff amount |  |  |  |  |  |  |  | $ 22,501,000 | $ 21,517,000 | $ 20,847,000
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  | $ 0 | (659,000) | (1,447,000)
Minimum coverage ratio |  |  |  |  |  |  |  | 1.20 |  |
Proceeds from unsecured senior notes, net of discount |  |  |  |  |  |  |  | $ 0 | 397,944,000 | 497,210,000
Deferred financing costs, net |  |  |  |  |  |  |  | 27,422,000 | 33,353,000 |
Debt outstanding |  |  |  |  |  |  |  | 2,848,492,000 | 2,870,993,000 |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Payments on credit facility |  |  |  |  |  |  |  | $ 130,000,000 | 250,000,000 | 295,000,000
Designated as Hedging Instrument | Treasury Lock |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative interest rate |  | 4.08% |  |  |  |  |  |  |  |
Single Family Homes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of properties | singleFamilyProperty |  |  |  |  |  |  |  | 53,584 |  |
Asset Backed Securitizations September 2014 Securitization | Single Family Homes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Loan payoff amount |  |  |  |  |  |  | $ 25,700,000 |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 513,300,000 |  |  |
Debt instrument term |  |  |  |  |  |  | 10 years |  |  |
Weighted-average interest rate |  |  |  |  |  |  | 4.42% |  |  |
Number of properties | property |  |  |  |  |  |  | 4,487 |  |  |
Proceeds from asset-backed securitizations |  |  |  |  |  |  | $ 487,700,000 |  |  |
Debt issuance cost |  |  |  |  |  |  | $ 12,900,000 |  |  |
Asset Backed Securitizations November 2014 Securitization | Single Family Homes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 528,400,000 |  |  |  |
Debt instrument term |  |  |  |  |  | 10 years |  |  |  |
Weighted-average interest rate |  |  |  |  |  | 4.40% |  |  |  |
Number of properties | property |  |  |  |  |  | 4,503 |  |  |  |
Proceeds from asset-backed securitizations |  |  |  |  |  | $ 528,400,000 |  |  |  |
Debt issuance cost |  |  |  |  |  | $ 12,900,000 |  |  |  |
Asset Backed Securitizations March 2015 Securitization | Single Family Homes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 552,800,000 |  |  |  |  |
Debt instrument term |  |  |  |  | 30 years |  |  |  |  |
Weighted-average interest rate |  |  |  |  | 4.14% |  |  |  |  |
Number of properties | property |  |  |  |  | 4,661 |  |  |  |  |
Proceeds from asset-backed securitizations |  |  |  |  | $ 552,800,000 |  |  |  |  |
Debt issuance cost |  |  |  |  | $ 13,300,000 |  |  |  |  |
Asset Backed Securitizations September 2015 Securitization | Single Family Homes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 477,700,000 |  |  |  |  |  |
Debt instrument term |  |  |  | 30 years |  |  |  |  |  |
Weighted-average interest rate |  |  |  | 4.36% |  |  |  |  |  |
Number of properties | singleFamilyProperty |  |  |  | 4,125 |  |  |  |  |  |
Proceeds from asset-backed securitizations |  |  |  | $ 477,700,000 |  |  |  |  |  |
Debt issuance cost |  |  |  | $ 11,300,000 |  |  |  |  |  |
Term loan facility, net |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Payments on credit facility |  |  |  |  |  |  |  | $ 0 | 100,000,000 | 100,000,000
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 |  |  | $ 1,000,000,000.0 |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt outstanding |  |  |  |  |  |  |  | $ 1,948,492,000 | 1,970,993,000 |
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
Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 1.34% |  |
Credit facility maximum borrowing capacity |  |  | $ 800,000,000.0 |  |  |  |  |  |  |
Commitment fee |  |  |  |  |  |  |  | 0.25% |  |
Number of debt instrument extension options | debtInstrumentExtensionOptions |  |  |  |  |  |  |  | 2 |  |
Line of credit extension period |  |  |  |  |  |  |  | 6 months |  |
Debt outstanding |  |  |  |  |  |  |  | $ 0 | 0 |
Line of Credit | Revolving Credit Facility | LIBOR |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  | 1.20% |  |
Line of Credit | Revolving Credit Facility | Minimum | LIBOR |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 0.825% |  |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | Minimum | Base Rate |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 0.00% |  |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | Maximum | LIBOR |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.55% |  |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | Maximum | Base Rate |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 0.55% |  |  |  |  |  |  |
Line of Credit | Term loan facility, net |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Payments on credit facility |  |  |  |  |  |  |  |  | 100,000,000.0 | 100,000,000.0
Write off of deferred debt issuance costs |  |  |  |  |  |  |  |  | 700,000 | $ 900,000
Line of Credit | Term Loan Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 200,000,000.0 |  |  |  |  |  |  |
Senior notes | 4.25% Senior Notes Due 2028 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 500,000,000.0 |  |  |  |  |  |  |  |
Interest rate |  | 4.25% |  |  |  |  |  | 4.25% |  |
Proceeds from unsecured senior notes, net of discount |  | $ 494,000,000.0 |  |  |  |  |  |  |  |
Underwriting fees |  | 3,200,000 |  |  |  |  |  |  |  |
Unamortized discount on debt |  | 2,800,000 |  |  |  |  |  |  |  |
Deferred financing costs, net |  | $ 1,900,000 |  |  |  |  |  |  |  |
Redeemable percentage of debt |  | 100.00% |  |  |  |  |  |  |  |
Debt outstanding |  |  |  |  |  |  |  | $ 500,000,000 | 500,000,000 |
Senior notes | 4.90 Percent Senior Notes Due 2029 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 400,000,000.0 |  |  |  |  |  |  |  |  |
Interest rate | 4.90% |  |  |  |  |  |  | 4.90% |  |
Proceeds from unsecured senior notes, net of discount | $ 395,300,000 |  |  |  |  |  |  |  |  |
Underwriting fees | 2,600,000 |  |  |  |  |  |  |  |  |
Unamortized discount on debt | 2,100,000 |  |  |  |  |  |  |  |  |
Deferred financing costs, net | $ 1,000,000.0 |  |  |  |  |  |  |  |  |
Redeemable percentage of debt | 100.00% |  |  |  |  |  |  |  |  |
Debt outstanding |  |  |  |  |  |  |  | $ 400,000,000 | $ 400,000,000 |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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