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Significant Accounting Policies (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) single_family_property | Dec. 31, 2017 USD ($) single_family_property | Dec. 31, 2016 USD ($)
Property Subject to or Available for Operating Lease |  |  |
Single-family properties under development and development land | $ 153,651,000 | $ 51,938,000 |
Deferred tax assets and liabilities | 0 |  |
Single-family Properties Held for Sale and Discontinued Operations [Abstract] |  |  |
Loss on impairment of single-family properties | 5,858,000 | 4,680,000 | $ 4,970,000
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |  |
Impairment of long-lived assets held-for-use | $ 0 | $ 0 | 0
Leasing Costs |  |  |
Lease amortization period | 1 year |  |
Building and Building Improvements | Maximum |  |  |
Depreciation and Amortization |  |  |
Estimated useful life of asset | 30 years |  |
Building and Building Improvements | Minimum |  |  |
Depreciation and Amortization |  |  |
Estimated useful life of asset | 3 years |  |
Single family homes |  |  |
Single-family Properties Held for Sale and Discontinued Operations [Abstract] |  |  |
Number of properties | single_family_property | 52,783 | 51,239 |
Single-family properties identified for future sale | Single family homes |  |  |
Single-family Properties Held for Sale and Discontinued Operations [Abstract] |  |  |
Number of properties | single_family_property | 1,945 | 310 |
Loss on impairment of single-family properties | $ 5,900,000 | $ 4,700,000 | $ 5,000,000
Value of in-place leases |  |  |
Investments in Real Estate |  |  |
Finite-lived intangible asset, useful life | 1 year |  |
U.S. Federal Tax Authority |  |  |
Property Subject to or Available for Operating Lease |  |  |
Net operating loss carryforward | $ 275,000,000 |  |

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