Acquisitions - Dispositions (Details) - HomeSmart $ in Millions |
3 Months Ended | 12 Months Ended | |
|---|---|---|---|
|
Mar. 31, 2016
USD ($)
|
Dec. 31, 2016
USD ($)
|
May 13, 2016
Store
|
|
| Disposal Group, Held-for-sale, Not Discontinued Operations | |||
| Business Acquisition [Line Items] | |||
| Disposal group, number of stores | Store | 82 | ||
| Disposal Group, Disposed of by Sale, Not Discontinued Operations | |||
| Business Acquisition [Line Items] | |||
| Disposal group, number of stores | Store | 82 | ||
| Charge related to write down of disposal group | $ | $ 4.6 | ||
| Disposal Group, Disposed of by Sale, Not Discontinued Operations | Other operating expense (income) | |||
| Business Acquisition [Line Items] | |||
| Charge related to write down of disposal group | $ | $ 4.3 |