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Significant Accounting Policies (Details 2) | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) reportable_segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Intangible Assets |  |  |
Impairment of intangible assets | $ 0 | $ 0 | $ 0
Goodwill |  |  |
Goodwill impairments | 0 | 0 | $ 0
Goodwill written off, sale of single-family properties |  | 400,000 |
Goodwill | 120,279,000 | 120,279,000 |
Allowance for Doubtful Accounts |  |  |
Allowance for doubtful accounts | $ 10,400,000 | $ 5,700,000 |
Revenue and Expense Recognition |  |  |
Revenue recognition period of operating lease | 1 year |  |
Segment Reporting |  |  |
Number of reportable segments | reportable_segment | 1 |  |
Trademark |  |  |
Intangible Assets |  |  |
Finite-lived intangible asset, useful life | 4 years 8 months 12 days |  |
Database |  |  |
Intangible Assets |  |  |
Finite-lived intangible asset, useful life | 7 years |  |

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