Income (Loss) Per Share of Class A and Class B Common Stock Basic and Diluted Earnings Per Share (Details) - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Basic net income (loss) per share
Allocation of net loss - continuing operations		$ (51,731,000)	$ (15,267,000)	$ (97,327,000)	$ (32,006,000)
Less: Allocation of net income attributable to noncontrolling interests		3,173,000	2,828,000	6,696,000	6,646,000
Net loss from discontinued operations		0	127,179,000	0	133,463,000
Net loss attributable to Groupon, Inc.		$ (54,904,000)	$ 109,084,000	$ (104,023,000)	$ 94,811,000
Basic, weighted average number of shares outstanding		576,903,004	671,630,169	579,827,341	674,006,553
Continuing operations		$ (0.10)	$ (0.03)	$ (0.18)	$ (0.06)
Discontinued operations		0.00	0.19	0.00	0.20
Basic, net (loss) earnings per share		$ (0.10)	$ 0.16	$ (0.18)	$ 0.14
Diluted net income (loss) per share
Basic, weighted average number of shares outstanding		576,903,004	671,630,169	579,827,341	674,006,553
Diluted, weighted average number of shares outstanding		576,903,004	671,630,169	579,827,341	674,006,553
Continuing operations		$ (0.10)	$ (0.03)	$ (0.18)	$ (0.06)
Discontinued operations		0.00	0.19	0.00	0.20
Diluted, net (loss) earnings per share		$ (0.10)	$ 0.16	$ (0.18)	$ 0.14
Common Class A [Member]
Basic net income (loss) per share
Allocation of net loss - continuing operations		$ (51,516,000)	$ (15,211,000)	$ (96,924,000)	$ (31,892,000)
Less: Allocation of net income attributable to noncontrolling interests		3,160,000	2,818,000	6,668,000	6,622,000
Allocation of net loss attributable to common stockholders - continuing operations		(54,676,000)	(18,029,000)	(103,592,000)	(38,514,000)
Net loss from discontinued operations		0	126,725,000	0	132,986,000
Net loss attributable to Groupon, Inc.		$ (54,676,000)	$ 108,696,000	$ (103,592,000)	$ 94,472,000
Basic, weighted average number of shares outstanding		574,503,028	669,230,193	577,427,365	671,606,577
Continuing operations		$ (0.10)	$ (0.03)		$ (0.06)
Discontinued operations		0.00	0.19		0.20
Basic, net (loss) earnings per share		$ (0.10)	$ 0.16		$ 0.14
Diluted net income (loss) per share
Allocation of net income attributable to common stockholders		$ (54,676,000)	$ 108,696,000	$ (103,592,000)	$ 94,472,000
Basic, weighted average number of shares outstanding		574,503,028	669,230,193	577,427,365	671,606,577
Conversion of Class B	[1]	0	0	0	0
Employee stock options	[1]	0	0	0	0
Dilutive Securities, Effect on Basic Earnings Per Share, Options and Restrictive Stock Units	[1]	$ 0	$ 0	$ 0	$ 0
Diluted, weighted average number of shares outstanding	[1]	574,503,028	669,230,193	577,427,365	671,606,577
Continuing operations		$ (0.10)	$ (0.03)		$ (0.06)
Discontinued operations		0.00	0.19		0.20
Diluted, net (loss) earnings per share		$ (0.10)	$ 0.16		$ 0.14
Common Class B [Member]
Basic net income (loss) per share
Allocation of net loss - continuing operations		$ (215,000)	$ (56,000)	$ (403,000)	$ (114,000)
Less: Allocation of net income attributable to noncontrolling interests		13,000	10,000	28,000	24,000
Allocation of net loss attributable to common stockholders - continuing operations		(228,000)	(66,000)	(431,000)	(138,000)
Net loss from discontinued operations		0	454,000	0	477,000
Net loss attributable to Groupon, Inc.		$ (228,000)	$ 388,000	$ (431,000)	$ 339,000
Basic, weighted average number of shares outstanding		2,399,976	2,399,976	2,399,976	2,399,976
Continuing operations		$ (0.10)	$ (0.03)	$ (0.18)	$ (0.06)
Discontinued operations		0.00	0.19	0.00	0.20
Basic, net (loss) earnings per share		$ (0.10)	$ 0.16	$ (0.18)	$ 0.14
Diluted net income (loss) per share
Allocation of net income attributable to common stockholders		$ (228,000)	$ 388,000	$ (431,000)	$ 339,000
Basic, weighted average number of shares outstanding		2,399,976	2,399,976	2,399,976	2,399,976
Conversion of Class B	[1]	0	0	0	0
Employee stock options	[1]	0	0	0	0
Dilutive Securities, Effect on Basic Earnings Per Share, Options and Restrictive Stock Units	[1]	$ 0	$ 0	$ 0	$ 0
Diluted, weighted average number of shares outstanding	[1]	2,399,976	2,399,976	2,399,976	2,399,976
Continuing operations		$ (0.10)	$ (0.03)	$ (0.18)	$ (0.06)
Discontinued operations		0.00	0.19	0.00	0.20
Diluted, net (loss) earnings per share		$ (0.10)	$ 0.16	$ (0.18)	$ 0.14
Continuing Operations [Member] | Common Class A [Member]
Diluted net income (loss) per share
Allocation of net loss attributable to common stockholders for basic computation		$ (54,676,000)	$ (18,029,000)	$ (103,592,000)	$ (38,514,000)
Reallocation of net income attributable to common stockholders as a result of conversion of Class B	[1]	0	0	0	0
Interest on Convertible Debt, Net of Tax		0		0
Allocation of net income attributable to common stockholders		(54,676,000)	(18,029,000)	(103,592,000)	(38,514,000)
Continuing Operations [Member] | Common Class B [Member]
Diluted net income (loss) per share
Allocation of net loss attributable to common stockholders for basic computation		(228,000)	(66,000)	(431,000)	(138,000)
Reallocation of net income attributable to common stockholders as a result of conversion of Class B	[1]	0	0	0	0
Interest on Convertible Debt, Net of Tax			0		0
Allocation of net income attributable to common stockholders		(228,000)	(66,000)	(431,000)	(138,000)
Discontinued Operations [Member] | Common Class A [Member]
Diluted net income (loss) per share
Allocation of net loss attributable to common stockholders for basic computation		0	126,725,000	0	132,986,000
Reallocation of net income attributable to common stockholders as a result of conversion of Class B	[1]	0	0	0	0
Allocation of net income attributable to common stockholders		0	126,725,000	0	132,986,000
Discontinued Operations [Member] | Common Class B [Member]
Diluted net income (loss) per share
Allocation of net loss attributable to common stockholders for basic computation		0	454,000	0	477,000
Reallocation of net income attributable to common stockholders as a result of conversion of Class B	[1]	0	0	0	0
Allocation of net income attributable to common stockholders		0	454,000	0	477,000
Convertible Debt [Member] | Common Class A [Member]
Diluted net income (loss) per share
Dilutive Securities, Effect on Basic Earnings Per Share	[1]	0	0	0	0
Convertible Debt [Member] | Common Class B [Member]
Diluted net income (loss) per share
Dilutive Securities, Effect on Basic Earnings Per Share	[1]	0	0	0	0
Warrant [Member] | Common Class A [Member]
Diluted net income (loss) per share
Dilutive Securities, Effect on Basic Earnings Per Share	[1]	0	0	0	0
Warrant [Member] | Common Class B [Member]
Diluted net income (loss) per share
Dilutive Securities, Effect on Basic Earnings Per Share	[1]	$ 0	$ 0	$ 0	$ 0

[1] The impact of the conversion of Class B common stock into Class A common stock, outstanding equity awards and outstanding convertible senior notes and warrants have not been reflected in the diluted income (loss) per share calculation for the three and six months ended June 30, 2016 and 2015 because the effect on net income (loss) per share from continuing operations would be antidilutive.