Discontinued Operations and Other Dispositions (Details) - USD ($) $ in Thousands, number in Millions							1 Months Ended		3 Months Ended			9 Months Ended
	Mar. 21, 2017	Mar. 10, 2017	Mar. 03, 2017	Aug. 06, 2016	May 09, 2016	Apr. 12, 2016	Mar. 09, 2017	Feb. 14, 2017	Sep. 30, 2017		Sep. 30, 2016	Sep. 30, 2017		Sep. 30, 2016	Feb. 16, 2017	Dec. 31, 2016	Aug. 05, 2016
Disposal Group Income Statement [Abstract]
Third party and other revenue									$ 302,458		$ 283,809	$ 919,884		$ 888,014
Direct revenue									332,008		402,746	1,050,827		1,220,736
Third party and other cost of revenue									(41,858)		(34,837)	(123,209)		(114,006)
Direct cost of revenue									(283,183)		(358,450)	(900,559)		(1,065,997)
Marketing expense									(101,456)		(84,748)	(288,456)		(261,223)
Selling, general and administrative expense									(214,828)		(234,266)	(677,061)		(755,981)
Restructuring Charges									(11,503)		(1,163)	(18,818)		(28,378)
Other income, net									7,546		(7,917)	8,822		(16,552)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax														200
Gain (Loss) on Disposition of Business									0		2,060	0		11,399
Accounts receivable, net									78,284			78,284				$ 71,272
Prepaid Expense and Other Assets, Current									99,855			99,855				94,441
Property, equipment and software, net									150,023			150,023				169,452
Goodwill									285,436			285,436				274,551
Assets, Noncurrent									17,302			17,302				23,484
Accrued merchant and supplier payable									598,251			598,251				770,992
Accrued Liabilities, Current									324,553			324,553				366,456
Deferred Tax Liabilities, Net, Noncurrent									1,927			1,927				1,714
Other Liabilities, Noncurrent									37,329			37,329				38,298
Discontinued Operations, Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash																28,866
Disposal Group Income Statement [Abstract]
Third party and other revenue									0		26,027	12,602		74,519
Direct revenue									0		7,886	2,962		25,200
Third party and other cost of revenue									0		(5,582)	(2,557)		(16,994)
Direct cost of revenue									0		(7,482)	(3,098)		(24,439)
Marketing expense									0		(3,110)	(1,239)		(8,393)
Selling, general and administrative expense									(500)	[1]	(19,288)	(11,784)	[1]	(55,729)
Restructuring Charges									0		(296)	(778)		(1,610)
Other income, net									0		889	3,852		2,249
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax									(500)		(956)	(40)		(5,197)
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax									(362)		0	(1,630)		0
Discontinued Operation, Tax Effect of Discontinued Operation									0	[2]	(389)	(81)	[2]	(1,168)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent									(862)	[2]	(1,345)	(1,751)	[2]	(6,365)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax									0		$ 0	14,718		0
Accounts receivable, net																15,386
Prepaid Expense and Other Assets, Current																18,994
Property, equipment and software, net																1,554
Goodwill																9,411
Assets, Noncurrent																1,041
Disposal Group, Including Discontinued Operation, Assets									$ 0			0				75,252
Accounts Payable																722
Accrued merchant and supplier payable																29,705
Accrued Liabilities, Current																16,625
Deferred Tax Liabilities, Net, Noncurrent																2,501
Other Liabilities, Noncurrent																426
Disposal Group, Including Discontinued Operation, Liabilities																$ 49,979
Groupon Israel [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Business Disposition, Controlling Stake Sold, Percentage	0.00%
Disposal Group Income Statement [Abstract]
Noncash or Part Noncash Acquisition, Investments Acquired	$ 400
Proceeds from Divestiture of Businesses, Net of Cash Divested												2,000
Professional Fees	100
Net Book Value	700
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax	$ 200
Gain (Loss) on Disposition of Business												1,800
Noncash or Part Noncash Divestiture, Amount of Consideration Received												2,300
Groupon Singapore [Member]
Disposal Group Income Statement [Abstract]
Noncash or Part Noncash Acquisition, Investments Acquired		$ 1,600
Professional Fees		500
Net Book Value		500
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax		$ 1,100
Gain (Loss) on Disposition of Business												500
Noncash or Part Noncash Divestiture, Amount of Consideration Received												1,100
Groupon Hong Kong [Member]
Disposal Group Income Statement [Abstract]
Proceeds from Divestiture of Businesses, Net of Cash Divested												200
Professional Fees			$ 100
Net Book Value			$ 200
Gain (Loss) on Disposition of Business												300
Noncash or Part Noncash Divestiture, Amount of Consideration Received												100
Groupon Latin America [Member]
Disposal Group Income Statement [Abstract]
Proceeds from Divestiture of Businesses, Net of Cash Divested												3,200
Professional Fees							$ 700
Net Book Value															$ 13,600
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax							15,700
Gain (Loss) on Disposition of Business												2,900
Unfavorable Contract Liability							2,100
Indemnification Liability							$ 5,400
Noncash or Part Noncash Divestiture, Amount of Consideration Received												$ 2,500
Groupon Russia [Member]
Disposal Group Income Statement [Abstract]
Professional Fees						$ 400
Net Book Value						1,600
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax														7,700
Gain (Loss) on Disposition of Business						$ 8,900
Breadcrumb [Member]
Disposal Group Income Statement [Abstract]
Noncash or Part Noncash Acquisition, Investments Acquired														8,300
Professional Fees					$ 100
Net Book Value					7,800
Gain (Loss) on Disposition of Business					$ 400
Noncash or Part Noncash Divestiture, Amount of Consideration Received														8,200
Groupon Indonesia [Member]
Disposal Group Income Statement [Abstract]
Noncash or Part Noncash Acquisition, Investments Acquired														2,700
Professional Fees				$ 300
Net Book Value																	$ 100
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax														200
Gain (Loss) on Disposition of Business				$ 2,100
Noncash or Part Noncash Divestiture, Amount of Consideration Received														$ 2,400
Capital Unit, Class B [Member] | Monster LP [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Fair-Value Option Investment, Recapitalization Transaction, Shares Exchanged								61,484,539

[1] (2)Selling, general and administrative expense from discontinued operations for the three and nine months ended September 30, 2017 includes increases to contingent liabilities under indemnification agreements. See Note 7, Commitments and Contingencies, for information about indemnification obligations related to discontinued operations.

[2] The income (loss) from discontinued operations before loss on dispositions and provision for income taxes for the three and nine months ended September 30, 2017 includes the results of each business through its respective disposition date.