Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenue:
Third party and other revenue	$ 1,879,729	$ 1,589,604	$ 312,941
Direct revenue	454,743	20,826	0
Total revenue	2,334,472	1,610,430	312,941
Cost of revenue:
Third party and other revenue	297,739	243,789	42,896
Direct revenue	421,201	15,090	0
Total cost of revenue	718,940	258,879	42,896
Gross Profit	1,615,532	1,351,551	270,045
Operating expenses:
Marketing	336,854	768,472	290,569
Selling, general and administrative	1,179,080	821,002	196,637
Acquisition-related expense (benefit), net	897	(4,537)	203,183
Total operating expenses	1,516,831	1,584,937	690,389
Income (loss) from operations	98,701	(233,386)	(420,344)
Interest and other income, net	6,166	5,973	284
Loss on equity method investees	(9,925)	(26,652)	0
Income (loss) before provision (benefit) for income taxes	94,942	(254,065)	(420,060)
Provision (benefit) for income taxes	145,973	43,697	(6,674)
Net income (loss)	(51,031)	(297,762)	(413,386)
Net loss (income) attributable to noncontrolling interests	(3,742)	18,335	23,746
Net (loss) income attributable to Groupon, Inc.	(54,773)	(279,427)	(389,640)
Dividends, Preferred Stock	0	0	(1,362)
Redemption of preferred stock in excess of carrying value	0	(34,327)	(52,893)
Adjustment of redeemable noncontrolling interests to redemption value	(12,604)	(59,740)	(12,425)
Net loss attributable to common stockholders	$ (67,377)	$ (373,494)	$ (456,320)
Net loss per share
Earnings Per Share, Basic	$ (0.10)	$ (1.03)	$ (1.33)
Earnings Per Share, Diluted	$ (0.10)	$ (1.03)	$ (1.33)
Weighted average number of shares outstanding
Weighted Average Number of Shares Outstanding, Basic	650,214,119	362,261,324	342,698,772
Weighted Average Number of Shares Outstanding, Diluted	650,214,119	362,261,324	342,698,772