Basis of Presentation (Details)	6 Months Ended
Jun. 30, 2015 item
Basis Of Presentation
Minimum number of products offered	7,000,000
Minimum number of suppliers providing products offered	7,000
Number of distinct brands	5

The minimum number of suppliers providing products offered by the entity.

No definition available.

Name:	w_MinimumNumberOfSuppliers
Namespace Prefix:	w_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration