Cover Document	9 Months Ended
	Sep. 30, 2013	Nov. 05, 2013 Common Class A [Member]	Nov. 05, 2013 Common Class B [Member]
Entity Registrant Name	Groupon, Inc.
Entity Central Index Key	0001490281
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3
Amendment Flag	false
Common Stock, Shares, Outstanding		665,719,847	2,399,976