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Significant Accounting Policies (Details 2) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2016 USD ($) nonperforming_loan reportable_segment | Dec. 31, 2015 USD ($) nonperforming_loan | Dec. 31, 2014 USD ($)
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 | 120,655,000 |
Nonperforming Loans |  |  |  |  |  |
Total investment |  |  |  | $ 200,000 | $ 34,600,000 |
Nonperforming loans | nonperforming_loan |  |  |  | 3 | 265 |
Allowance for Doubtful Accounts |  |  |  |  |  |
Allowance for doubtful accounts |  |  |  | $ 5,700,000 | $ 3,000,000 |
Revenue and Expense Recognition |  |  |  |  |  |
Revenue recognition period of operating lease |  |  |  | 1 year |  |
Segment Reporting |  |  |  |  |  |
Number of reportable segments | reportable_segment |  |  |  | 1 |  |
Value of in-place leases |  |  |  |  |  |
Intangible Assets |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  | 1 year |  |
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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