Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Real estate segment
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 74,924	$ 58,371
Real estate segment | Brokerage revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	70,143	54,471
Real estate segment | Partner revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	4,781	3,900
Other segment
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	4,969	1,497
Other segment | Redfin Now home sales revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	3,052	0
Other segment | Other services revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 1,917	$ 1,497