XML 25 R8.htm IDEA: XBRL DOCUMENT

Basis of Presentation	12 Months Ended
Basis of Presentation	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation Wayfair Inc. (the "Company") is one of the world's largest online destinations for the home. Through its e-commerce business model, the Company offers visually inspired browsing, compelling merchandising, easy product discovery and attractive prices for over fourteen million products from over 11,000 suppliers.