Cover Document (USD $)	12 Months Ended
	Dec. 31, 2012	Jun. 30, 2012	Feb. 25, 2013 Common Class A [Member]	Feb. 25, 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-K
Document Period End Date	Dec. 31, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY
Amendment Flag	false
Common Stock, Shares, Outstanding			656,063,487	2,399,976
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float		$ 3,699,527,694