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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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