Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net loss from continuing operations	$ (5,403)	$ (48,768)	$ (26,272)	$ (92,307)
Other comprehensive (loss) income, net of tax:
Reclassification of amount included in net income (loss) from continuing operations		(1,800)		(300)
Net change in unrealized gain (loss) - Foreign Currency Translation			(22,225)
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	0	0	583	0
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), Net of Tax	0	19	2	46
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	0	(19)	585	(46)
Net change in unrealized gain (loss), net, on AFS	(952)	(52)	(713)	(168)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	(1,341)	0	(1,341)	0
Other comprehensive income (loss)			(23,694)
Comprehensive loss	(15,216)	(60,793)	(50,855)	(109,241)
Net loss from discontinued operations	(1,376)	(2,963)	(889)	(5,020)
Comprehensive income attributable to noncontrolling interests	(2,547)	(3,173)	(6,579)	(6,696)
Comprehensive loss attributable to Groupon Inc.	(17,763)	(63,966)	(57,434)	(115,937)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Other comprehensive (loss) income, net of tax:
Net change in unrealized gain (loss), net, on AFS	(2,293)	(52)	(2,054)	(168)
Other comprehensive income (loss)			585
Continuing Operations [Member]
Other comprehensive (loss) income, net of tax:
Net unrealized gain (losses) during the period	(6,144)	(272)	(5,527)	(4,068)
Reclassification of amount included in net income (loss) from continuing operations	0	(9,459)	(187)	(7,997)
Net change in unrealized gain (loss) - Foreign Currency Translation	(6,144)	(9,731)	(5,714)	(12,065)
Other comprehensive income (loss)	(8,437)	(9,764)	(7,183)	(12,187)
Comprehensive loss	(13,840)	(58,532)	(33,455)	(104,494)
Discontinued Operations, Disposed of by Sale [Member]
Other comprehensive (loss) income, net of tax:
Net unrealized gain (losses) during the period	0	702	(1,793)	273
Reclassification of amount included in net income (loss) from continuing operations	0	0	(14,718)	0
Net change in unrealized gain (loss) - Foreign Currency Translation	0	702	(16,511)	273
Other comprehensive income (loss)	$ (1,376)	$ (2,261)	$ (17,400)	$ (4,747)