Groupon (GRPN) 10-Q 7 May 14 2014 Q1 Quarterly report Financial data

Cover_Document

Cover Document	3 Months Ended
	Mar. 31, 2014	2-May-14	2-May-14
		Common Class A [Member]	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-Q	'	'
Document Period End Date	31-Mar-14	'	'
Document Fiscal Year Focus	'2014	'	'
Document Fiscal Period Focus	'Q1	'	'
Amendment Flag	'false	'	'
Common Stock, Shares, Outstanding	'	679,794,637	2,399,976

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$1,038,824	$1,240,472
Accounts receivable, net	125,527	83,673
Deferred income taxes	29,897	27,938
Prepaid expense and other current assets	234,102	210,415
Total current assets	1,428,350	1,562,498
Property, equipment and software, net	159,649	134,423
Goodwill	447,370	220,827
Intangible assets, net	140,738	28,443
Investments	24,450	20,652
Deferred income taxes, non-current	44,559	35,941
Other non-current assets	35,490	39,226
Total Assets	2,280,606	2,042,010
Current liabilities:	'	'
Accounts payable	45,524	27,573
Accrued merchant and supplier payables	816,329	752,943
Accrued expenses	253,015	226,986
Deferred income taxes	48,368	47,558
Other current liabilities	134,315	132,718
Total current liabilities	1,297,551	1,187,778
Deferred income taxes, non-current	12,331	10,853
Other non-current liabilities	147,197	131,697
Total Liabilities	1,457,079	1,330,328
Commitments and contingencies	'	'
Stockholders' Equity	'	'
Additional paid-in capital	1,768,271	1,584,211
Treasury Stock, Value	-76,048	-46,587
Accumulated Deficit	-886,665	-848,870
Accumulated other comprehensive income	20,020	24,830
Total Groupon, Inc. Stockholders' Equity	825,647	713,651
Noncontrolling interests	-2,120	-1,969
Total Equity	823,527	711,682
Total Liabilities and Equity	2,280,606	2,042,010
Common Class A [Member]	'	'
Stockholders' Equity	'	'
Common Stock, Value, Issued	69	67
Common Class B [Member]	'	'
Stockholders' Equity	'	'
Common Stock, Value, Issued	0	0
Common Stock [Member]	'	'
Stockholders' Equity	'	'
Common Stock, Value, Issued	$0	$0

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets Parenthetical (USD $)	Mar. 31, 2014	Dec. 31, 2013
Common Stock [Member]	'	'
Condensed Consolidated Balance Sheet Parenthetical [Line Items]	'	'
Common Stock, Par Value	$0.00	$0.00
Common Stock, Shares Authorized	2,010,000,000	2,010,000,000
Common Stock, Shares, Issued	0	0
Common Stock, Shares, Outstanding	0	0
Common Class A [Member]	'	'
Condensed Consolidated Balance Sheet Parenthetical [Line Items]	'	'
Common Stock, Par Value	$0.00	$0.00
Common Stock, Shares Authorized	2,000,000,000	2,000,000,000
Common Stock, Shares, Issued	687,288,634	670,149,976
Common Stock, Shares, Outstanding	679,780,134	665,717,176
Common Class B [Member]	'	'
Condensed Consolidated Balance Sheet Parenthetical [Line Items]	'	'
Common Stock, Par Value	$0.00	$0.00
Common Stock, Shares Authorized	10,000,000	10,000,000
Common Stock, Shares, Issued	2,399,976	2,399,976
Common Stock, Shares, Outstanding	2,399,976	2,399,976
Treasury Stock [Member]	'	'
Condensed Consolidated Balance Sheet Parenthetical [Line Items]	'	'
Treasury Stock, Shares	-7,508,500	-4,432,800

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Revenue:	'	'
Third party and other	$426,429	$439,108
Direct	331,208	162,294
Total revenue	757,637	601,402
Cost of revenue:	'	'
Third party and other	62,351	70,016
Direct	309,565	152,377
Total cost of revenue	371,916	222,393
Gross Profit	385,721	379,009
Operating expenses:	'	'
Marketing	78,924	49,557
Selling, general and administrative	324,965	308,206
Acquisition-related expense, net	1,785	68
Total operating expenses	405,674	357,831
(Loss) Income from operations	-19,953	21,178
Other expense, net	-840	-5,083
(Loss) Income before provision for income taxes	-20,793	16,095
Provision for income taxes	14,570	19,337
Net loss	-35,363	-3,242
Net income attributable to noncontrolling interests	-2,432	-750
Net loss attributable to Groupon, Inc.	($37,795)	($3,992)
Net loss per share	'	'
Basic, net (loss) earnings per share	($0.06)	($0.01)
Diluted, net (loss) earnings per share	($0.06)	($0.01)
Weighted average number of shares outstanding	'	'
Basic, weighted average number of shares outstanding	682,378,690	658,800,417
Diluted, weighted average number of shares outstanding	682,378,690	658,800,417

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (Loss) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Net loss	($35,363)	($3,242)
Other comprehensive (loss) income, net of tax:	'	'
Foreign currency translation adjustments	-4,612	2,143
Unrealized (loss) gain on available-for-sale debt securities	-301	157
Other comprehensive (loss) income	-4,913	2,300
Comprehensive loss	-40,276	-942
Comprehensive income attributable to noncontrolling interests	-2,329	-709
Comprehensive loss attributable to Groupon Inc.	($42,605)	($1,651)

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Operating activities	'	'
Net loss	($35,363)	($3,242)
Adjustments to reconcile net loss to net cash provided by operating activities:	'	'
Depreciation and amortization of property, equipment and software	22,092	15,114
Amortization of acquired intangible assets	12,648	5,586
Stock-based compensation	23,729	29,907
Deferred income taxes	573	-258
Excess tax benefits on stock based compensation	-5,855	-832
(Gain) loss on equity method investments	-52	19
(Gain) loss, net from changes in fair value of contingent consideration	-39	68
Impairment of cost method investment	397	0
Change in assets and liabilities, net of acquisitions:	'	'
Restricted cash	2,950	2,523
Accounts receivable	-24,393	-7,684
Prepaid expenses and other current assets	-5,150	12,527
Accounts payable	7,315	-19,606
Accrued merchant and supplier payables	-23,649	-39,417
Accrued expenses and other current liabilities	-5,379	13,302
Other, net	9,459	753
Net cash (used in) provided by operating activities	-20,717	8,760
Investing activities	'	'
Purchases of property and equipment and capitalized software	-16,355	-14,468
Acquisitions of businesses, net of acquired cash	-117,654	-1,169
Purchases of investments	-4,599	-13,083
Settlement of liabilities related to purchase of additional interest in consolidated subsidiary	0	-1,959
Net cash used in investing activities	-138,608	-30,679
Financing activities	'	'
Payments for purchases of treasury stock	-29,840	0
Excess tax benefits on stock-based compensation	5,855	832
Taxes paid related to net share settlements of stock-based compensation awards	-14,083	-7,712
Common stock issuance costs in connection with acquisition of business	-158	0
Settlements of purchase price obligations related to acquisitions	-3,136	-2,000
Proceeds from stock option exercises and employee stock purchase plan	2,812	705
Partnership distributions to noncontrolling interest holders	-2,053	-1,065
Payments of capital lease obligations	-889	-102
Net cash used in financing activities	-41,492	-9,342
Effect of exchange rate changes on cash and cash equivalents	-831	-12,378
Net decrease in cash and cash equivalents	-201,648	-43,639
Cash and cash equivalents, beginning of period	1,240,472	1,209,289
Cash and cash equivalents, end of period	1,038,824	1,165,650
Non-cash investing and financing activities	'	'
Issuance of common stock in connection with acquisition of business	162,862	0
Contingent consideration liabilities incurred in connection with acquisitions	0	30
Equipment acquired under capital lease obligations	4,031	6,538
Shares issued to settle liability-classified awards and contingent consideration	1,041	1,131
Liability for purchases of treasury stock	1,368	'
Liability for purchase consideration	359	'
Accounts payable and accrued expenses related to purchases of property and equipment and capitalized software	$12,423	$2,828

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Stockholders' Equity (USD $)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Parent [Member]	Noncontrolling Interest [Member]	Total Equity [Member]
In Thousands, except Share data, unless otherwise specified
Beginning Balance, Equity at Dec. 31, 2013	$711,682	$67	$1,584,211	($46,587)	($848,870)	$24,830	$713,651	($1,969)	$711,682
Beginning Balance, Shares, Outstanding at Dec. 31, 2013	'	672,549,952	'	-4,432,800	'	'	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'	'	'	'
Net loss	-35,363	'	'	'	-37,795	'	-37,795	2,432	-35,363
Foreign currency translation adjustments	-4,612	'	'	'	'	-4,509	-4,509	-103	-4,612
Unrealized loss on available-for-sale debt security, net of tax	'	'	'	'	'	-301	-301	'	-301
Common stock issued in connection with acquisition of business, shares	13,825,283	13,825,283	'	'	'	'	'	'	'
Stock Issued During Period, Value, Acquisitions, Net of Issuance Costs	'	1	162,704	'	'	'	162,705	'	162,705
Shares issued to settle liability-classified awards, shares	'	102,180	'	'	'	'	'	'	'
Shares issued to settle liability-classified awards and contingent consideration	1,041	'	'	'	'	'	1,041	'	1,041
Exercise of stock options, shares	'	357,291	'	'	'	'	'	'	'
Exercise of stock options, value	'	'	362	'	'	'	362	'	362
RSU, Vested in Period	'	3,819,150	'	'	'	'	'	'	'
Vesting of restricted stock units, value	'	1	-1	'	'	'	'	'	'
Shares issued under employee stock purchase plan, shares	'	333,824	'	'	'	'	'	'	'
Shares issued under employee stock purchase plan, value	'	'	2,450	'	'	'	2,450	'	2,450
Tax withholding related to net share settlements of stock-based compensation awards, shares	'	-1,299,070	'	'	'	'	'	'	'
Tax withholding related to net share settlements of stock-based compensation awards, value	'	'	-13,570	'	'	'	-13,570	'	-13,570
Stock-based compensation on equity-classified awards	'	'	26,031	'	'	'	26,031	'	26,031
Excess tax benefits, net of shortfalls, on stock-based compensation awards	'	'	5,043	'	'	'	5,043	'	5,043
Purchases of treasury stock, shares	'	'	'	-3,075,700	'	'	'	'	'
Purchases of treasury stock, value	'	'	'	-29,461	'	'	-29,461	'	-29,461
Partnership distributions to noncontrolling interest holders	'	'	'	'	'	'	'	-2,480	-2,480
Ending Balance, Equity at Mar. 31, 2014	$823,527	$69	$1,768,271	($76,048)	($886,665)	$20,020	$825,647	($2,120)	$823,527
Ending Balance, Shares, Outstanding at Mar. 31, 2014	'	689,688,610	'	-7,508,500	'	'	'	'	'

Description_of_Business_and_Ba

Description of Business and Basis of Presentation	3 Months Ended
	Mar. 31, 2014
DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION [Abstract]	'
Description of Business and Basis of Presentation [Text Block]	'
	DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION
	Company Information
	Groupon, Inc. and subsidiaries (the "Company"), which commenced operations in October 2008, operates online local commerce marketplaces throughout the world that connect merchants to consumers by offering goods and services at a discount. The Company also offers deals on products for which it acts as the merchant of record. Customers can access the Company's deal offerings directly through its websites and mobile applications. The Company also sends emails to its subscribers each day with deal offerings that are targeted by location and personal preferences.
	The Company's operations are organized into three principal segments: North America, EMEA, which is comprised of Europe, Middle East and Africa, and the remainder of the Company's international operations ("Rest of World"). During the second quarter of 2013, the Company changed the composition of its operating segments to separate its former International segment between EMEA and Rest of World. See Note 11 "Segment Information" for further information.
	Unaudited Interim Financial Information
	The Company has prepared the accompanying condensed consolidated financial statements pursuant to the rules and regulations of the Securities and Exchange Commission ("SEC") for interim financial reporting. These condensed consolidated financial statements are unaudited and, in the Company's opinion, include all adjustments, consisting of normal recurring adjustments and accruals, necessary for a fair presentation of the Company's condensed consolidated balance sheets, statements of operations, comprehensive loss, cash flows and stockholders' equity for the periods presented. Operating results for the periods presented are not necessarily indicative of the results to be expected for the full year ending December 31, 2014. Certain information and disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles ("U.S. GAAP") have been omitted in accordance with the rules and regulations of the SEC. These condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and accompanying notes included in the Company's Annual Report on Form 10-K for the year ended December 31, 2013, as filed with the SEC on February 20, 2014.
	Principles of Consolidation
	The condensed consolidated financial statements include the accounts of the Company and its subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. The Company's consolidated financial statements were prepared in accordance with U.S. GAAP and include the assets, liabilities, revenue and expenses of all wholly‑owned subsidiaries and majority‑owned subsidiaries over which the Company exercises control and variable interest entities for which the Company has determined that it is the primary beneficiary. Outside stockholders' interests in subsidiaries are shown on the condensed consolidated financial statements as "Noncontrolling interests." Equity investments in entities in which the Company does not have a controlling financial interest are accounted for under either the equity method, the cost method or as available-for-sale securities, as appropriate.
	Reclassifications
	Certain reclassifications have been made to the condensed consolidated financial statements of prior periods and the accompanying notes to conform to the current period presentation.
	Use of Estimates
	The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires estimates and assumptions that affect the reported amounts and classifications of assets and liabilities, revenue and expenses, and the related disclosures of contingent liabilities in the condensed consolidated financial statements and accompanying notes. Estimates are utilized for, but not limited to, stock‑based compensation, income taxes, valuation of acquired goodwill and intangible assets, investments, customer refunds, contingent liabilities and the useful lives of property, equipment and software and intangible assets. Actual results could differ materially from those estimates.

Business_Combinations_and_Acqu

Business Combinations and Acquisitions of Noncontrolling Interests	3 Months Ended
	Mar. 31, 2014
Business Combinations [Abstract]	'
Business Combinations and Acquisitions of Noncontrolling Interests Disclosure [Text Block]	'
	BUSINESS COMBINATIONS
	The Company acquired two businesses during the three months ended March 31, 2014.  These business combinations were accounted for using the acquisition method, and the results of each of those acquired businesses have been included in the condensed consolidated financial statements beginning on the respective acquisition dates. The fair value of consideration transferred in business combinations is allocated to the tangible and intangible assets acquired and liabilities assumed at the acquisition date, with the remaining unallocated amount recorded as goodwill. The allocations of the acquisition price for recent acquisitions have been prepared on a preliminary basis, and changes to those allocations may occur as a result of final working capital adjustments and 2013 tax return filings. Acquired goodwill represents the premium the Company paid over the fair value of the net tangible and intangible assets acquired. The Company paid this premium for a number of reasons, including growing the Company's merchant and customer base, acquiring assembled workforces, expanding its presence in international markets and expanding and advancing its product offerings. The goodwill from these business combinations is not deductible for tax purposes.
	For the three months ended March 31, 2014, $1.8 million of external transaction costs related to business combinations, primarily consisting of legal and advisory fees, are classified within "Acquisition-related expense, net" on the condensed consolidated statement of operations.
	LivingSocial Korea, Inc.
	On January 2, 2014, the Company acquired all of the outstanding equity interests of LivingSocial Korea, Inc., a Korean corporation and holding company of Ticket Monster Inc. ("Ticket Monster"). Ticket Monster is an e-commerce company based in the Republic of Korea that connects merchants to consumers by offering goods and services at a discount. The primary purpose of this acquisition was to grow the Company's merchant and customer base and expand its presence in the Korean e-commerce market. The aggregate acquisition-date fair value of the consideration transferred for the Ticket Monster acquisition totaled $263.0 million, which consisted of the following (in thousands):
	Cash		$	100,120
	Issuance of 13,825,283 shares of Class A common stock		162,862
	Total		$	262,982
	The fair value of the Class A Common Stock issued as consideration was measured based on the stock price upon closing of the transaction on January 2, 2014.
	The following table summarizes the allocation of the aggregate acquisition price of the Ticket Monster acquisition (in thousands):
	Cash and cash equivalents	$	24,768
	Accounts receivable	15,832
	Deferred income taxes	1,264
	Prepaid expenses and other current assets	829
	Property, equipment and software	5,944
	Goodwill	223,850
	Intangible assets:(1)
	Subscriber relationships	57,022
	Merchant relationships	32,176
	Developed technology	571
	Trade name	19,325
	Other non-current assets	3,033
	Total assets acquired	$	384,614
	Accounts payable	$	5,951
	Accrued merchant and supplier payables	82,934
	Accrued expenses	22,334
	Other current liabilities	3,482
	Deferred income taxes, non-current	1,264
	Other non-current liabilities	5,667
	Total liabilities assumed	$	121,632
	Total acquisition price	$	262,982
	-1	The acquired intangible assets have estimated useful lives of between 2 and 5 years.
	Ideeli, Inc.
	On January 13, 2014, the Company acquired all of the outstanding equity interests of Ideeli, Inc. ("Ideeli"), a fashion flash site based in the United States. The primary purpose of this acquisition was to expand and advance the Company's product offerings. The aggregate acquisition-date fair value of the consideration transferred for the Ideeli acquisition totaled $42.7 million, which consisted of the following (in thousands):
	Cash		$	42,381
	Liability for purchase consideration		359
	Total		$	42,740
	The following table summarizes the allocation of the aggregate acquisition price of the Ideeli acquisition (in thousands):
	Cash and cash equivalents	$	79
	Accounts receivable	988
	Deferred income taxes	572
	Prepaid expenses and other current assets	22,081
	Property, equipment and software	8,173
	Goodwill	5,421
	Intangible assets(1):
	Subscriber relationships	5,490
	Brand relationships	7,100
	Trade name	4,500
	Deferred income taxes, non-current	7,753
	Total assets acquired	$	62,157
	Accounts payable	$	1,640
	Accrued supplier payables	4,092
	Accrued expenses	9,118
	Other current liabilities	482
	Deferred income taxes, non-current	332
	Other non-current liabilities	3,753
	Total liabilities assumed	$	19,417
	Total acquisition price	$	42,740
	-1	The acquired intangible assets have estimated useful lives of between 3 and 5 years.
	Pro Forma Financial Information
	The following unaudited pro forma information presents the combined operating results of the Company for the three months ended March 31, 2013, as if the Company had acquired Ticket Monster and Ideeli as of January 1, 2013 (in thousands). Pro forma results of operations have not been presented for the three months ended March 31, 2014, because the operating results of Ticket Monster and Ideeli from January 1, 2014 through their respective acquisition dates were not material to the Company's consolidated results of operations for the three months ended March 31, 2014. The underlying pro forma results include the historical financial results of the Company and its two acquired businesses adjusted for depreciation and amortization expense associated with the assets acquired. The unaudited pro forma results do not reflect any operating efficiencies or potential cost savings which may result from the consolidation of the operations of the Company and the acquired entities. Accordingly, these unaudited pro forma results are presented for informational purposes only and are not necessarily indicative of what the actual results of operations of the combined company would have been if the acquisitions had occurred as of January 1, 2013, nor are they indicative of future results of operations.
		Three Months Ended March 31, 2013
	Revenue	$	652,100
Net loss	(28,424		)
The revenue and net loss of Ticket Monster included in our condensed consolidated statement of operations for the three months ended March 31, 2014 were $29.2 million and $13.6 million, respectively. The revenue and net loss of Ideeli included in our condensed consolidated statement of operations for the three months ended March 31, 2014 were $15.9 million and $2.5 million, respectively.

Goodwill_and_Other_Intangible_

Goodwill and Other Intangible Assets	3 Months Ended
	Mar. 31, 2014
GOODWILL AND OTHER INTANGIBLE ASSETS [Abstract]	'
Goodwill and Intangible Assets Disclosure [Text Block]	'
	GOODWILL AND OTHER INTANGIBLE ASSETS
	The following table summarizes the Company's goodwill activity by segment for the three months ended March 31, 2014(in thousands):
			North America		EMEA		Rest of World			Consolidated
	Balance as of December 31, 2013		$	85,457	$	115,669	$	19,701		$	220,827
	Goodwill related to acquisitions		5,421		—		223,850			229,271
	Other adjustments(1)		—		14		(2,742		)	(2,728		)
	Balance as of March 31, 2014		$	90,878	$	115,683	$	240,809		$	447,370
	-1	Includes changes in foreign exchange rates for goodwill.
	The following tables summarize the Company's other intangible assets (in thousands):
			31-Mar-14
	Asset Category		Gross Carrying Value		Accumulated Amortization		Net Carrying Value
	Subscriber relationships		$	107,348	$	36,578	$	70,770
	Merchant relationships		40,952		11,023		29,929
	Trade names		30,317		7,831		22,486
	Developed technology		23,679		20,918		2,761
	Brand relationships		7,100		395		6,705
	Other intangible assets		16,754		8,667		8,087
	Total		$	226,150	$	85,412	$	140,738
			31-Dec-13
	Asset Category		Gross Carrying Value		Accumulated Amortization		Net Carrying Value
	Subscriber relationships		$	45,541	$	30,866	$	14,675
	Merchant relationships		9,186		7,991		1,195
	Trade names		6,739		6,739		—
	Developed technology		23,038		19,547		3,491
	Other intangible assets		16,776		7,694		9,082
	Total		$	101,280	$	72,837	$	28,443
	Amortization of intangible assets is computed using the straight-line method over their estimated useful lives, which range from 1 to 5 years. Amortization expense related to intangible assets was $12.6 million and $5.6 million for the three months ended March 31, 2014 and 2013, respectively. As of March 31, 2014, the Company's estimated future amortization expense related to intangible assets is as follows (in thousands):
	Remaining amounts in 2014		$	33,977
	2015		38,703
	2016		32,176
	2017		18,118
	2018		17,764
	Thereafter		—
			$	140,738

Investments

Investments	3 Months Ended
	Mar. 31, 2014
Investments, All Other Investments [Abstract]	'
Cost and Equity Method Investments Disclosure [Text Block]	'
	INVESTMENTS
	The following table summarizes the Company's investments (dollars in thousands):
		March 31, 2014		Percent Ownership of Voting Stock						31-Dec-13				Percent Ownership of Voting Stock
	Cost and equity method investments:
	Cost method investments	$	15,416	6	%	to	19	%		$	15,788			6	%	to	19	%
	Equity method investments	1,742		21	%	to	50	%		1,690				21	%	to	50	%
	Total cost and equity method investments	17,158								17,478
	Available-for-sale securities:
	Convertible debt securities	2,693								3,174
	Redeemable preferred shares	4,599		19	%	to	23	%		—				19	%
	Total available-for-sale securities	7,292								3,174
	Total investments	$	24,450							$	20,652
	In February 2014, the Company acquired a 23% ownership interest in an online home services company for $4.6 million. The investment was in the form of redeemable preferred shares, and the securities are accounted for as available-for-sale.
	The following table summarizes the amortized cost, gross unrealized loss and fair value of the Company's available-for-sale securities as of March 31, 2014 and December 31, 2013 (in thousands):
		31-Mar-14										31-Dec-13
		Amortized Cost		Gross Unrealized Loss				Fair Value				Amortized Cost				Gross Unrealized Loss			Fair Value
	Available-for-sale securities:
	Convertible debt securities	$	3,370	$	(677	)		$	2,693			$	3,370			$	(196	)	$	3,174
	Redeemable preferred shares	4,599		—				4,599				—				—			—
	Total available-for-sale securities	$	7,969	$	(677	)		$	7,292			$	3,370			$	(196	)	$	3,174
	The Company's investments in convertible debt securities have been in an unrealized loss position for less than one year as of March 31, 2014.
	Other-Than-Temporary Impairment
	An unrealized loss exists when the current fair value of an investment is less than its amortized cost basis. The Company conducts reviews of all of its investments with unrealized losses on a quarterly basis to evaluate whether those impairments are other-than-temporary. This evaluation, which is performed at the individual investment level, consists of several qualitative and quantitative factors regarding the severity and duration of the unrealized loss as well as the Company's intent and ability to hold the investment for a period of time that is sufficient to allow for an anticipated recovery in value. Evidence considered in this evaluation includes the amount of the impairment, the length of time that the investment has been impaired, the factors contributing to the impairment, the financial condition and near-term prospects of the investee, recent operating trends and forecasted performance of the investee, market conditions in the geographic area or industry in which the investee operates, and the Company's strategic plans for holding the investment in relation to the period of time expected for an anticipated recovery in value. Additionally, the Company considers whether it intends to sell the investment or whether it is more likely than not that it will be required to sell the investment before recovery of its amortized cost basis. Investments with unrealized losses that are determined to be other-than-temporary are written down to fair value with a charge to earnings. Unrealized losses that are determined to be temporary in nature are not recorded for cost method investments and equity method investments, while such losses are recorded, net of tax, in accumulated other comprehensive income for available-for-sale securities. The Company's investment in the redeemable preferred shares of Life Media Limited ("F-tuan"), an entity with operations based in China, was written down to zero through an other-than-temporary impairment charge as of December 31, 2013, and continues to have an estimated fair value of zero as of March 31, 2014.

Supplemental_Consolidated_Bala

Supplemental Consolidated Balance Sheet and Statement of Operations Information	3 Months Ended
	Mar. 31, 2014
SUPPLEMENTAL CONSOLIDATED BALANCE SHEET AND STATEMENT OF OPERATIONS INFORMATION [Abstract]	'
Additional Financial Information Disclosures [Text Block]	'
	SUPPLEMENTAL CONSOLIDATED BALANCE SHEETS AND STATEMENTS OF OPERATIONS INFORMATION
	The following table summarizes the Company's other expense, net for the three months ended March 31, 2014 and 2013 (in thousands):
		Three Months Ended March 31,
		2014			2013
	Interest income	$	376		$	429
	Interest expense	(88		)	(57		)
	Impairment of investment	(397		)	—
	Gain (loss) on equity method investments	52			(19		)
	Foreign exchange and other	(783		)	(5,436		)
	Other expense, net	$	(840	)	$	(5,083	)
	The following table summarizes the Company's prepaid expenses and other current assets as of March 31, 2014 and December 31, 2013 (in thousands):
		31-Mar-14			31-Dec-13
	Current portion of unamortized tax effects on intercompany transactions	$	27,340		$	28,502
	Finished goods inventories	63,323			57,097
	Prepaid expenses	35,409			29,404
	Restricted cash	19,665			14,579
	VAT and income taxes receivable	60,461			52,960
	Prepaid marketing	15,117			17,301
	Other	12,787			10,572
	Total prepaid expenses and other current assets	$	234,102		$	210,415
	The following table summarizes the Company's accrued merchant and supplier payables as of March 31, 2014 and December 31, 2013 (in thousands):
		31-Mar-14			31-Dec-13
	Accrued merchant payables	$	615,696		$	518,233
	Accrued supplier payables(1)	200,633			234,710
	Total accrued merchant and supplier payables	$	816,329		$	752,943
	-1	Amounts include payables to suppliers of inventories and providers of shipping and fulfillment services.
	The following table summarizes the Company's accrued expenses as of March 31, 2014 and December 31, 2013 (in thousands):
		31-Mar-14			31-Dec-13
	Marketing	$	16,660		$	12,001
	Refunds reserve	37,720			38,597
	Payroll and benefits	72,150			64,966
	Customer credits	47,799			44,728
	Professional fees	24,730			24,670
	Other	53,956			42,024
	Total accrued expenses	$	253,015		$	226,986
	The following table summarizes the Company's other current liabilities as of March 31, 2014 and December 31, 2013 (in thousands):
		31-Mar-14			31-Dec-13
	Income taxes payable	$	20,407		$	21,994
	VAT payable	34,095			37,627
	Sales taxes payable	4,934			10,412
	Deferred revenue	59,141			47,259
	Other	15,738			15,426
	Total other current liabilities	$	134,315		$	132,718
	The following table summarizes the Company's other non-current liabilities as of March 31, 2014 and December 31, 2013 (in thousands):
		31-Mar-14			31-Dec-13
	Long-term tax liabilities	$	114,495		$	109,286
	Deferred rent	12,849			9,148
	Other	19,853			13,263
	Total other non-current liabilities	$	147,197		$	131,697
	The following table summarizes the components of accumulated other comprehensive income as of March 31, 2014 and December 31, 2013 (in thousands):
		March 31, 2014			December 31, 2013
	Foreign currency translation adjustments	$	20,443		$	24,952
	Unrealized loss on available-for-sale securities, net of tax	(423		)	(122		)
	Accumulated other comprehensive income	$	20,020		$	24,830

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies Disclosure [Text Block]	'
	COMMITMENTS AND CONTINGENCIES
	Except for commitments under operating leases that were assumed in connection with the Ticket Monster and Ideeli acquisitions, as described in Note 2, "Business Combinations," the Company's commitments as of March 31, 2014 did not materially change from the amounts set forth in its 2013 Annual Report on Form 10-K. As of March 31, 2014, estimated future payments under operating leases assumed in connection with the Ticket Monster and Ideeli acquisitions for each of the next five years and thereafter are as follows (in thousands):
		Operating leases
	2014	$	3,958
	2015	5,112
	2016	4,911
	2017	4,326
	2018	2,631
	Thereafter	11,110
	Total minimum lease payments	$	32,048
	Legal Matters
	From time to time, the Company is party to various legal proceedings incident to the operation of its business. For example, the Company is currently involved in proceedings by stockholders, former employees, intellectual property infringement suits and suits by customers (individually or as class actions) alleging, among other things, violation of the Credit Card Accountability, Responsibility and Disclosure Act, and state laws governing gift cards, stored value cards and coupons. Additionally, the Company is subject to general customer complaints seeking monetary damages, particularly in its Rest of World segment. The following is a brief description of the more significant legal proceedings.
	On February 8, 2012, the Company issued a press release announcing its expected financial results for the fourth quarter of 2012.  After finalizing its year-end financial statements, the Company announced on March 30, 2012 revised financial results, as well as a material weakness in its internal control over financial reporting related to deficiencies in its financial statement close process.  The revisions resulted in a reduction to fourth quarter 2011 revenue of $14.3 million. The revisions also resulted in an increase to fourth quarter operating expenses that reduced operating income by $30.0 million, net income by $22.6 million and earnings per share by $0.04.  Following this announcement, the Company and several of its current and former directors and officers were named as parties to the following outstanding securities and stockholder derivative lawsuits all arising out of the same alleged events and facts.
	The Company is currently a defendant in a proceeding pursuant to which, on October 29, 2012, a consolidated amended class action complaint was filed against the Company, certain of its directors and officers, and the underwriters that participated in the initial public offering of the Company's Class A common stock.  Originally filed in April 2012, the case is currently pending before the United States District Court for the Northern District of Illinois: In re Groupon, Inc. Securities Litigation. The complaint asserts claims pursuant to Sections 11 and 15 of the Securities Act of 1933 and Sections 10(b) and 20(a) of the Securities Exchange Act of 1934.  Allegations in the consolidated amended complaint include that the Company and its officers and directors made untrue statements or omissions of material fact by issuing inaccurate financial statements for the fiscal quarter and the fiscal year ending December 31, 2011 and by failing to disclose information about the Company's financial controls in the registration statement and prospectus for the Company's initial public offering of Class A common stock and in the Company's subsequently-issued financial statements.  The putative class action lawsuit seeks an unspecified amount of monetary damages, reimbursement for fees and costs incurred in connection with the actions, including attorneys' fees, and various other forms of monetary and non-monetary relief.  The defendants filed a motion to dismiss the consolidated amended complaint on January 18, 2013, which the Court denied on September 19, 2013.  Defendants’ answered the consolidated amended class action complaint on December 6, 2013. Plaintiff filed an amended motion for class certification on December 4, 2013. On March 6, 2014, defendants filed their response briefs in opposition to the amended motion for class certification. On April 21, 2014, lead plaintiff filed a reply brief in support of his amended motion for class certification.  On March 18, 2014, the court entered a scheduling order setting deadlines for fact discovery by March 13, 2015, expert discovery by August 31, 2015, and dispositive motions by October 30, 2015.
	In addition, federal and state purported stockholder derivative lawsuits have been filed against certain of the Company's current and former directors and officers.  The federal purported stockholder derivative lawsuit was originally filed in April 2012 and a consolidated stockholder derivative complaint, filed on July 30, 2012, is currently pending in the United States District Court for the Northern District of Illinois: In re Groupon Derivative Litigation.  Plaintiffs assert claims for breach of fiduciary duty and abuse of control.  The state derivative cases are currently pending before the Chancery Division of the Circuit Court of Cook County, Illinois: Orrego v. Lefkofsky, et al., was filed on April 5, 2012; and Kim v. Lefkofsky, et al., was filed on May 25, 2012. The state derivative complaints generally allege that the defendants breached their fiduciary duties by purportedly mismanaging the Company's business by, among other things, failing to utilize proper accounting controls and, in the case of one of the state derivative lawsuits, by engaging in alleged insider trading of the Company's Class A common stock and misappropriating information.  In addition, one state derivative case asserts a claim for unjust enrichment.  The derivative lawsuits purport to seek to recoup for the Company an unspecified amount of monetary damages allegedly sustained by the Company, restitution from defendants, reimbursement for fees and costs incurred in connection with the actions, including attorneys' fees, and various other forms of monetary and non-monetary relief.  On June 20, 2012, the Company and the individual defendants filed a motion requesting that the court stay the federal derivative actions pending resolution of the Federal Class Actions.  On July 31, 2012, the court granted defendants' motion in part, and stayed the Federal derivative actions pending a separate resolution of upcoming motions to dismiss in the federal class actions.  On June 15, 2012, the state plaintiffs filed a motion to consolidate the state derivative actions, which was granted on July 2, 2012, and on July 5, 2012, the plaintiffs filed a motion for appointment of co-lead plaintiffs and co-lead counsel, which was granted on July 27, 2012.  No consolidated complaint has been filed in the state derivative action. On September 14, 2012, the court granted a motion filed by the parties requesting that the court stay the state derivative actions pending the federal court's resolution of anticipated motions to dismiss in the federal class actions.  On April 18, 2013, the state court appointed a lead plaintiff and approved its selection of lead counsel and local counsel for the purported class. Following entry of the court's order denying defendants' motions to dismiss in In re Groupon Securities Litigation, the parties in both the state and federal derivative actions filed motions requesting that the Court extend the litigation stay currently in place pending further developments in In re Groupon, Inc. Securities Litigation. The state court granted the motion to stay on December 6, 2013, and the federal court granted the motion to stay on January 22, 2014.
	The Company intends to defend all of the securities and stockholder derivative lawsuits vigorously.
	The Company was named as a defendant in a series of class actions that came to be consolidated into a single case in the U.S. District Court for the Southern District of California.  The consolidated case is referred to as In re Groupon Marketing and Sales Practices Litigation. The Company denies liability, but the parties agreed to settle the litigation for $8.5 million before any determination had been made on the merits or with respect to class certification.  Because the case had been filed as a class action, the parties were required to provide proper notice and obtain court approval for the settlement. During that process, certain individuals asserted various objections to the settlement.  The parties to the case opposed the objections and on December 14, 2012, the district court approved the settlement over the various objections.
	Subsequent to the entry of the order approving settlement, certain of the objectors filed a notice of appeal, contesting the settlement and appealing the matter to the Ninth Circuit of the U.S. Court of Appeals, where the case remains pending.  The Company believes that the settlement is valid and intends to oppose the appeal.  Plaintiffs also maintain that the settlement is valid and will be opposing the appeal.  The settlement, however, is not effective during the pendency of the appeal.  The Company does not know when the appeal will be resolved.  Depending on the outcome of the appeal, it is possible that the settlement will be rejected, or that there will be further proceedings in the appellate court or district court, or that the settlement will be enforced at that time without further objections or proceedings.
	In addition, third parties have from time to time claimed, and others may claim in the future, that the Company has infringed their intellectual property rights. The Company is subject to intellectual property disputes, and expects that it will increasingly be subject to intellectual property infringement claims as its services expand in scope and complexity. The Company has in the past been forced to litigate such claims, and several of these claims are currently pending. The Company may also become more vulnerable to third party claims as laws such as the Digital Millennium Copyright Act are interpreted by the courts, and as the Company becomes subject to laws in jurisdictions where the underlying laws with respect to the potential liability of online intermediaries are either unclear or less favorable. The Company believes that additional lawsuits alleging that it has violated patent, copyright or trademark laws will be filed against it. Intellectual property claims, whether meritorious or not, are time consuming and costly to resolve, could require expensive changes in the Company's methods of doing business, or could require it to enter into costly royalty or licensing agreements.
	The Company is also subject to, or in the future may become subject to, a variety of regulatory inquiries across the jurisdictions where the Company conducts its business, including, for example, consumer protection, marketing practices, tax and privacy rules and regulations. Any regulatory actions against the Company, whether meritorious or not, could be time consuming, result in costly litigation, damage awards, injunctive relief or increased costs of doing business through adverse judgment or settlement, require the Company to change its business practices in expensive ways, require significant amounts of management time, result in the diversion of significant operational resources or otherwise harm the Company's business.
	The Company establishes an accrued liability for loss contingencies related to legal and regulatory matters when the loss is both probable and estimable. In such cases, there may be an exposure to loss in excess of the amounts accrued. There is inherent uncertainty related to the matters described above for a number of reasons, including the early stage and lack of specific damage claims in many of them. However, based on the information currently available, the Company believes that the amount of reasonably possible losses in excess of the amounts accrued would not have a material adverse effect on its business, consolidated financial position, results of operations or cash flows. The Company's accrued liabilities for loss contingencies related to legal and regulatory matters may change in the future due to new developments or changes in strategy in handling these matters. Regardless of the outcome, litigation can have an adverse impact on the Company because of defense and settlement costs, diversion of management resources and other factors.
	Indemnifications
	In the normal course of business to facilitate transactions related to its operations, the Company indemnifies certain parties, including employees, lessors, service providers and merchants, with respect to various matters. The Company has agreed to hold certain parties harmless against losses arising from a breach of representations or covenants, or other claims made against those parties. These agreements may limit the time within which an indemnification claim can be made and the amount of the claim. The Company is also subject to increased exposure to various claims as a result of its acquisitions, particularly in cases where the Company is entering into new businesses in connection with such acquisitions. The Company may also become more vulnerable to claims as it expands the range and scope of its services and is subject to laws in jurisdictions where the underlying laws with respect to potential liability are either unclear or less favorable. In addition, the Company has entered into indemnification agreements with its officers and directors, and the Company's bylaws contain similar indemnification obligations to agents.
	It is not possible to determine the maximum potential amount under these indemnification agreements due to the limited history of prior indemnification claims and the unique facts and circumstances involved in each particular agreement. Historically, any payments that the Company has made under these agreements have not had a material impact on the operating results, financial position or cash flows of the Company.

Stockholders_Equity_and_StockB

Stockholders' Equity and Stock-Based Compensation Stockholders' Equity and Stock-Based Compensation (Note)	3 Months Ended
	Mar. 31, 2014
Stockholders' Equity Note [Abstract]	'
Stockholders' Equity and Stock-Based Compensation Note [Text Block]	'
	STOCKHOLDERS' EQUITY AND STOCK-BASED COMPENSATION
	Common Stock
	The Board of Directors (the "Board") has authorized three classes of common stock: Class A common stock, Class B common stock and common stock. No shares of common stock will be issued or outstanding until October 31, 2016, at which time all outstanding shares of Class A common stock and Class B common stock will automatically convert into shares of common stock. In addition, the Board has authorized shares of undesignated preferred stock, the rights, preferences and privileges of which may be designated from time to time by the Board.
	Share Repurchase Programs
	The Board has authorized the Company to purchase up to $300 million of its outstanding Class A common stock through August 2015. The timing and amount of any share repurchases is determined based on market conditions, share price and other factors, and the program may be discontinued or suspended at any time. During the three months ended March 31, 2014, the Company purchased 3,075,700 shares of Class A common stock for an aggregate purchase price of $29.5 million (including fees and commissions) under the share repurchase program. As of March 31, 2014, up to $224.0 million of Class A common stock remains available for repurchase under the share repurchase program.
	Groupon, Inc. Stock Plans
	The Groupon, Inc. Stock Plans (the "Plans") are administered by the Compensation Committee of the Board, which determines the number of awards to be issued, the corresponding vesting schedule and the exercise price for options. As of March 31, 2014, 18,692,035 shares were available for future issuance under the Plans.
	The Company recognized stock-based compensation expense of $23.7 million and $29.9 million for the three months ended March 31, 2014 and 2013, respectively, related to stock awards issued under the Plans, acquisition-related awards and subsidiary awards. The Company also capitalized $2.3 million and $2.6 million of stock-based compensation for the three months ended March 31, 2014 and 2013, respectively, in connection with internally-developed software.
	As of March 31, 2014, a total of $229.8 million of unrecognized compensation costs related to unvested stock awards and unvested acquisition-related awards are expected to be recognized over a remaining weighted average period of 1.5 years.
	Employee Stock Purchase Plan
	The Company is authorized to grant up to 10,000,000 shares of common stock under its employee stock purchase plan ("ESPP"). For the three months ended March 31, 2014 and 2013, 333,824 and 271,402 shares of common stock were issued under the ESPP, respectively.
	Stock Options
	The table below summarizes the stock option activity for the three months ended March 31, 2014:
			Options		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value
								(in thousands) (1)
	Outstanding at December 31, 2013		3,355,054		$	1.11	6.04	$	35,742
	Exercised		(357,291	)	$	1.02
	Forfeited		(3,929	)	$	1.87
	Outstanding at March 31, 2014		2,993,834		$	1.11	5.79	$	20,144
	Exercisable at March 31, 2014		2,743,019		$	0.99	5.73	$	18,788
	-1	The aggregate intrinsic value of options outstanding and exercisable represents the total pretax intrinsic value (the difference between the fair value of the Company's stock on the last day of each period and the exercise price, multiplied by the number of options where the fair value exceeds the exercise price) that would have been received by the option holders had all option holders exercised their options as of March 31, 2014 and December 31, 2013, respectively.
	Restricted Stock Units
	The table below summarizes activity regarding unvested restricted stock units under the Plans during the three months ended March 31, 2014:
			Restricted Stock Units		Weighted- Average Grant Date Fair Value (per share)
	Unvested at December 31, 2013		41,648,055		$	8.06
	Granted		6,657,851		$	10.05
	Vested		(3,819,150	)	$	7.29
	Forfeited		(4,271,952	)	$	8.49
	Unvested at March 31, 2014		40,214,804		$	8.45
	Performance Share Units
	The Company completed its acquisition of Ticket Monster on January 2, 2014, as described in Note 2 "Business Combinations," and approximately 2,000,000 performance share units were granted to certain key employees of that subsidiary during the three months ended March 31, 2014. The vesting of these awards into shares of the Company's Class A common stock is contingent upon the subsidiary's achievement of specified financial targets over three annual performance periods for the years ending December 31, 2014, 2015 and 2016 and is subject to continued employment at the end of each performance period. If the financial targets for a performance period are not achieved, no common stock will be issued for that performance period. The grant date fair value of the performance share units was $8.07 per share.
	Restricted Stock Awards
	The Company has granted restricted stock awards in connection with prior period business combinations. Compensation expense on these awards is recognized on a straight-line basis over the requisite service periods.
	The table below summarizes activity regarding unvested restricted stock for the three months ended March 31, 2014:
			Restricted Stock		Weighted- Average Grant Date Fair Value (per share)
	Unvested at December 31, 2013		97,677		$	14
	Vested		(26,015	)	$	15.78
	Unvested at March 31, 2014		71,662		$	15.93

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2014
INCOME TAXES [Abstract]	'
Income Tax Disclosure [Text Block]	'
	INCOME TAXES
	The Company's tax provision for interim periods is determined using an estimate of its annual effective tax rate, adjusted for discrete items.
	For the three months ended March 31, 2014, the Company recorded income tax expense of $14.6 million on pre-tax losses of $20.8 million, for an effective tax rate of (70.1)%. For the three months ended March 31, 2013, the Company recorded income tax expense of $19.3 million on pre-tax income of $16.1 million, for an effective tax rate of 120.1%.
	The Company's U.S. statutory rate is 35%. The most significant factors impacting the effective tax rate for the three months ended March 31, 2014 and 2013 were losses in jurisdictions that the Company is not able to benefit due to uncertainty as to the realization of those losses, amortization of the tax effects of intercompany sales of intellectual property and nondeductible stock-based compensation expense.
	As of March 31, 2014, the unamortized tax effects of intercompany transactions of $27.3 million and $13.6 million are included within "Prepaid expenses and other current assets" and "Other non-current assets," respectively, on the condensed consolidated balance sheet. As of December 31, 2013, unamortized tax effects of intercompany transactions of $28.5 million and $20.4 million are included within "Prepaid expenses and other current assets" and "Other non-current assets," respectively, on the condensed consolidated balance sheet. As of March 31, 2014, the estimated future amortization of the tax effects of intercompany transactions to income tax expense is $20.6 million for the remainder of 2014 and $20.3 million for 2015. These amounts exclude the benefits, if any, for tax deductions in other jurisdictions that the Company may be entitled to as a result of the related intercompany transactions.

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2014
FAIR VALUE MEASUREMENTS [Abstract]	'
Fair Value Measurements [Text Block]	'
	FAIR VALUE MEASUREMENTS
	Fair value is defined under U.S. GAAP as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. As such, fair value is a market-based measurement that is determined based on assumptions that market participants would use in pricing an asset or a liability.
	To increase the comparability of fair value measures, the following hierarchy prioritizes the inputs in valuation methodologies used to measure fair value:
	Level 1-Measurements that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets.
	Level 2-Measurements that include other inputs that are directly or indirectly observable in the marketplace.
	Level 3-Measurements derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable. These fair value measurements require significant judgment.
	In determining fair value, the Company uses various valuation approaches within the fair value measurement framework. The valuation methodologies used for the Company's assets and liabilities measured at fair value and their classification in the valuation hierarchy are summarized below:
	Cash equivalents - Cash equivalents primarily consist of AAA-rated money market funds with overnight liquidity and no stated maturities. The Company classified cash equivalents as Level 1 due to the short-term nature of these instruments and measured the fair value based on quoted prices in active markets for identical assets.
	Available-for-sale securities - The Company has investments in redeemable preferred shares and convertible debt securities issued by nonpublic entities. The Company measures the fair value of available-for-sale securities using the discounted cash flow method, which is an income approach, and the probability-weighted expected return method, which is an income approach that incorporates probability-weighted outcomes.
	The Company has classified its investments in available-for-sale securities as Level 3 due to the lack of observable market data over fair value inputs such as cash flow projections, discount rates and probability-weightings. Increases in projected cash flows and decreases in discount rates contribute to increases in the estimated fair values of available-for-sale securities, whereas decreases in projected cash flows and increases in discount rates contribute to decreases in their fair values. Additionally, increases in the probabilities of favorable investment outcomes, such as a sale or initial public offering of the investee, and decreases in the probabilities of unfavorable outcomes, such as a default by the investee, contribute to increases in the estimated fair value of available-for-sale securities, whereas decreases in the probabilities of favorable investment outcomes and increases in the probabilities of unfavorable investment outcomes contribute to decreases in their fair values.
	Contingent consideration - The Company has previously had contingent obligations to transfer cash payments and equity shares to the former owners in conjunction with certain acquisitions if specified operational objectives and financial results are met over future reporting periods. Liabilities for contingent consideration (i.e., earn-outs) are measured at fair value each reporting period, with the acquisition-date fair value included as part of the consideration transferred and subsequent changes in fair value are recorded in earnings within "Acquisition-related expense, net" on the condensed consolidated statements of operations. There were no outstanding contingent consideration arrangements as of March 31, 2014.
	The Company uses an income approach to value contingent consideration liabilities, which is determined based on the present value of probability-weighted future cash flows. The Company has generally classified the contingent consideration liabilities as Level 3 due to the lack of relevant observable market data over fair value inputs such as probability-weighting of payment outcomes. Increases in the assessed likelihood of a higher payout under a contingent consideration arrangement contribute to increases in the fair value of the related liability. Conversely, decreases in the assessed likelihood of a higher payout under a contingent consideration arrangement contribute to decreases in the fair value of the related liability.
	The following tables summarize the Company's assets and liabilities that are measured at fair value on a recurring basis (in thousands):
					Fair Value Measurement at Reporting Date Using
	Description	31-Mar-14			Quoted Prices in Active Markets for			Significant Other			Significant
					Identical Assets			Observable			Unobservable
					(Level 1)			Inputs			Inputs
								(Level 2)			(Level 3)
	Assets:
	Cash equivalents	$	585,536		$	585,536		$	—		$	—
	Available-for-sale securities:
	Convertible debt securities	$	2,693		$	—		$	—		$	2,693
	Redeemable preferred shares	$	4,599		$	—		$	—		$	4,599
					Fair Value Measurement at Reporting Date Using
	Description	31-Dec-13			Quoted Prices in Active Markets for			Significant Other			Significant
					Identical Assets			Observable			Unobservable
					(Level 1)			Inputs			Inputs
								(Level 2)			(Level 3)
	Assets:
	Cash equivalents	$	585,514		$	585,514		$	—		$	—
	Available-for-sale securities:
	Convertible debt securities	$	3,174		$	—		$	—		$	3,174
	Redeemable preferred shares	$	—		$	—		$	—		$	—
	Liabilities:
	Contingent consideration	$	606		$	—		$	—		$	606
	The following table provides a roll-forward of the fair value of recurring Level 3 fair value measurements for the three months ended March 31, 2014 and 2013 (in thousands):
		Three Months Ended March 31,
		2014			2013
	Assets
	Available-for-sale securities
	Convertible debt securities:
	Beginning Balance	$	3,174		$	3,087
	Total (losses) gains included in other comprehensive (loss) income	(481		)	254
	Ending Balance	$	2,693		$	3,341
	Unrealized losses (gains) still held(1)	$	481		$	(254	)
	Redeemable preferred shares(2):
	Beginning Balance	$	—		$	42,539
	Purchase of redeemable preferred shares	4,599			—
	Ending Balance	$	4,599		$	42,539
	Unrealized (gains) losses still held(1)	$	—		$	—
	Liabilities
	Contingent Consideration:
	Beginning Balance	$	606		$	7,601
	Issuance of contingent consideration in connection with acquisitions	—			30
	Settlements of contingent consideration liabilities	(424		)	—
	Reclass to non-fair value liabilities when no longer contingent	(143		)	—
	Total (gains) losses included in earnings(3)	(39		)	68
	Ending Balance	$	—		$	7,699
	Unrealized (gains) losses still held(1)	$	—		$	68
	-1	Represents the unrealized (gains) losses recorded in earnings or other comprehensive (loss) income during the period for assets and liabilities classified as Level 3 that are still held (or outstanding) at the end of the period.
	-2	For the three months ended March 31, 2013, the Company's investments in Life Media Limited (F-tuan) preferred shares were previously classified as cost method investments and have been reclassified to the available-for-sale category in this table. The balance as of March 31, 2013 represents the Company’s investments in F-tuan preferred shares, which were written down to zero through an other-than-temporary impairment charge as of December 31, 2013 and continue to have an estimated fair value of zero as of March 31, 2014. The $4.6 million balance as of March 31, 2014 represents the Company's investment in the preferred shares of an online home services company during the current period, as described in Note 4 "Investments."
	-3	Changes in the fair value of contingent consideration liabilities are classified within "Acquisition-related expense, net" on the condensed consolidated statements of operations.
	Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
Certain assets and liabilities are measured at fair value on a nonrecurring basis, including assets that are written down to fair value as a result of an impairment. The Company did not record any significant nonrecurring fair value measurements after initial recognition during the three months ended March 31, 2014 and 2013.
Estimated Fair Value of Financial Assets and Liabilities Not Measured at Fair Value
The following table presents the carrying amounts and fair values of financial instruments that are not carried at fair value in the condensed consolidated financial statements (in thousands):
		31-Mar-14						31-Dec-13
		Carrying Amount			Fair Value			Carrying Amount			Fair Value
Cost method investments		$	15,416		$	15,629		$	15,788		$	15,573
The fair values of the Company's cost method investments were determined using the market approach or the income approach, depending on the availability of fair value inputs such as financial projections for the investees and market multiples for comparable companies. The Company has classified the fair value measurements of its cost method investments as Level 3 measurements within the fair value hierarchy because they involve significant unobservable inputs such as cash flow projections and discount rates.
The Company's other financial instruments not carried at fair value consist primarily of short term certificates of deposit, accounts receivable, restricted cash, accounts payable, accrued merchant and supplier payables and accrued expenses. The carrying values of these assets and liabilities approximate their respective fair values as of March 31, 2014 and December 31, 2013 due to their short term nature.

Loss_Per_Share_of_Class_A_and_

Loss Per Share of Class A and Class B Common Stock	3 Months Ended
	Mar. 31, 2014
LOSS PER SHARE OF CLASS A AND CLASS B COMMON STOCK [Abstract] [Abstract]	'
Loss Per Share of Class A and Class B Common Stock [Text Block]	'
	LOSS PER SHARE OF CLASS A AND CLASS B COMMON STOCK
	The Company computes loss per share of Class A and Class B common stock using the two-class method. Basic loss per share is computed using the weighted-average number of common shares outstanding during the period. Diluted loss per share is computed using the weighted-average number of common shares and the effect of potentially dilutive equity awards outstanding during the period. Potentially dilutive securities consist of stock options, restricted stock units, unvested restricted stock awards, performance share units and ESPP shares. The dilutive effect of these equity awards are reflected in diluted loss per share by application of the treasury stock method. The computation of the diluted loss per share of Class A common stock assumes the conversion of Class B common stock, if dilutive, while the diluted loss per share of Class B common stock does not assume the conversion of those shares.
	The rights, including the liquidation and dividend rights, of the holders of Class A and Class B common stock are identical, except with respect to voting. Under the two-class method, the undistributed earnings for each period are allocated based on the contractual participation rights of the Class A and Class B common shares as if the earnings for the period had been distributed. As the liquidation and dividend rights are identical, the undistributed earnings are allocated on a proportionate basis. Further, as the Company assumes the conversion of Class B common stock, if dilutive, in the computation of the diluted loss per share of Class A common stock, the undistributed earnings are equal to net income for that computation.
	The following table sets forth the computation of basic and diluted loss per share of Class A and Class B common stock for the three months ended March 31, 2014 and 2013 (in thousands, except share amounts and per share amounts):
			Three Months Ended March 31,
			2014						2013
			Class A			Class B			Class A			Class B
	Basic loss per share:
	Numerator
	Allocation of net loss		$	(35,239	)	$	(124	)	$	(3,231	)	$	(11	)
	Less: Allocation of net income attributable to noncontrolling interests		2,423			9			747			3
	Allocation of net loss attributable to common stockholders		$	(37,662	)	$	(133	)	$	(3,978	)	$	(14	)
	Denominator
	Weighted-average common shares outstanding		679,978,714			2,399,976			656,400,441			2,399,976
	Basic loss per share		$	(0.06	)	$	(0.06	)	$	(0.01	)	$	(0.01	)
	Diluted loss per share:
	Numerator
	Allocation of net loss attributable to common stockholders		$	(37,662	)	$	(133	)	$	(3,978	)	$	(14	)
	Reallocation of net income attributable to common stockholders as a result of conversion of Class B(1)		—			—			—			—
	Allocation of net loss attributable to common stockholders		$	(37,662	)	$	(133	)	$	(3,978	)	$	(14	)
	Denominator
	Weighted-average common shares outstanding used in basic computation		679,978,714			2,399,976			656,400,441			2,399,976
	Conversion of Class B(1)		—			—			—			—
	Employee stock options(1)		—			—			—			—
	Restricted shares and RSUs(1)		—			—			—			—
	Weighted-average diluted shares outstanding(1)		679,978,714			2,399,976			656,400,441			2,399,976
	Diluted loss per share		$	(0.06	)	$	(0.06	)	$	(0.01	)	$	(0.01	)
	-1	Conversion of Class B shares into Class A shares and outstanding equity awards have not been reflected in the diluted loss per share calculation for the three months ended March 31, 2014 and 2013 because the effect would be antidilutive.
	The following outstanding equity awards are not included in the diluted loss per share calculation above because they would have had an antidilutive effect:
		Three Months Ended March 31,
		2014			2013
	Stock options	3,233,467			6,854,309
	Restricted stock units	40,166,021			35,224,459
	Restricted stock	77,008			354,128
	ESPP shares	422,873			568,174
	Total	43,899,369			43,001,070
	In addition to the antidilutive awards as set forth in the table above, the Company also granted approximately 2,000,000 performance share units in connection with its acquisition of Ticket Monster during the three months ended March 31, 2014. Contingently issuable shares are excluded from the computation of diluted EPS if, based on current period results, the shares would not be issuable if the end of the reporting period were the end of the contingency period. These outstanding performance share units have been excluded from the table above for the three months ended March 31, 2014 as the performance conditions would not have been satisfied as of the end of the period.

Segment_Information

Segment Information	3 Months Ended
	Mar. 31, 2014
SEGMENT INFORMATION [Abstract]	'
Segment Reporting Disclosure [Text Block]	'
	SEGMENT INFORMATION
	The Company previously organized its operations into two principal segments: North America, which represents the United States and Canada, and International, which represented the rest of the Company's global operations. In February 2013, the Company's former CEO was terminated by the Board and a new Office of the Chief Executive was established to serve the functions of the CEO. The Office of the Chief Executive was comprised of two members of the Board, Eric Lefkofsky and Ted Leonsis, who collectively functioned as the Company's chief operating decision-maker ("CODM"). Beginning in June 2013, the financial information reported to the CODM, which is used in making resource allocation decisions and assessing operating performance, separated the Company's former International segment between EMEA and Rest of World. As a result of this change in the financial information reported to the CODM, the Company updated its segment disclosures to separately report three segments: North America, EMEA and Rest of World. Prior period segment information has been retrospectively adjusted to reflect this change.
	In August 2013, the Board appointed Mr. Lefkofsky as CEO. Mr. Lefkofsky was previously a member of the Office of the Chief Executive and continues to be the Company's CODM.
	Revenue and profit or loss information by reportable segment reconciled to consolidated net loss for the three months ended March 31, 2014 and 2013 were as follows (in thousands):
		Three Months Ended March 31,
		2014			2013
	North America
	Revenue(1)	$	431,062		$	339,554
	Segment cost of revenue and operating expenses(2)	419,677			298,188
	Segment operating income(2)	11,385			41,366
	EMEA
	Revenue(3)	230,893			183,798
	Segment cost of revenue and operating expenses(2)	211,970			149,622
	Segment operating income(2)	18,923			34,176
	Rest of World
	Revenue	95,682			78,050
	Segment cost of revenue and operating expenses(2)	120,429			102,439
	Segment operating loss(2)	(24,747		)	(24,389		)
	Consolidated
	Revenue	757,637			601,402
	Segment cost of revenue and operating expenses(2)	752,076			550,249
	Segment operating income(2)	5,561			51,153
	Stock-based compensation	23,729			29,907
	Acquisition-related expense, net	1,785			68
	(Loss) income from operations	(19,953		)	21,178
	Other expense, net	(840		)	(5,083		)
	(Loss) income before provision for income taxes	(20,793		)	16,095
	Provision for income taxes	14,570			19,337
	Net loss	$	(35,363	)	$	(3,242	)
	-1	North America includes revenue from the United States of $419.9 million and $326.8 million for the three months ended March 31, 2014 and 2013, respectively.
	-2	Segment cost of revenue and operating expenses and segment operating income (loss) exclude stock-based compensation and acquisition-related expense (benefit), net. This presentation corresponds to the measure of segment profit or loss that the Company's chief operating decision maker uses in assessing segment performance and making resource allocation decisions. For the three months ended March 31, 2014 and 2013, stock-based compensation expense was approximately $19.5 million and $22.8 million, respectively, for the North America segment, approximately $2.3 million and $3.1 million, respectively, for the EMEA segment and approximately $2.0 million and $4.0 million, respectively, for the Rest of World segment. For the three months ended March 31, 2014 and 2013, acquisition-related expense, net was approximately $1.6 million and $0.1 million, respectively, for the North America segment and approximately $0.1 million of expense and $0.1 million of benefit, respectively, for the EMEA segment. Acquisition-related expense, net for the North America segment includes gains and losses relating to contingent consideration obligations incurred by U.S. legal entities relating to purchases of businesses that became part of the EMEA and Rest of World segments, which is consistent with the attribution used for internal reporting purposes.
	-3	Beginning in September 2013, direct revenue transactions in the EMEA Goods category have been transacted through a Switzerland-based subsidiary. As a result, EMEA includes revenue from Switzerland of $91.9 million for the three months ended March 31, 2014.
	The following table summarizes the Company's total assets by reportable segment as of March 31, 2014 and December 31, 2013 (in thousands):
		31-Mar-14			31-Dec-13
	North America (1)	$	1,141,248		$	1,267,158
	EMEA	607,890			616,126
	Rest of World (1)	531,468			158,726
	Consolidated total assets	$	2,280,606		$	2,042,010
	-1	North America contains assets from the United States of $1,123.2 million and $1,231.3 million as of March 31, 2014 and December 31, 2013, respectively. Rest of World contains assets from the Republic of Korea, including those assets acquired as a part of our acquisition of Ticket Monster described in Note 2 "Business Combinations," of $384.4 million as of March 31, 2014. There were no other individual countries that represented more than 10% of consolidated total assets as of March 31, 2014 and December 31, 2013, respectively.
	Category Information
	The Company offers goods and services through three primary categories: Local Deals ("Local"), Groupon Goods ("Goods") and Groupon Getaways ("Travel"). The Company also earns advertising revenue, payment processing revenue, point of sale revenue, reservation revenue and commission revenue. Revenue and gross profit from these other sources were previously considered to be distinct from our primary categories and were aggregated with revenue and gross profit from Travel, our smallest category. In recent periods, these other revenue sources have been increasingly viewed by management as a component of the Local category, as they are primarily generated through the Company’s relationships with local and national merchants. Accordingly, the Company has updated its presentation of category information in the current period to include other revenue and gross profit within the Local category in the tables below, and the prior period category information has been retrospectively adjusted to conform to the current period presentation.
	The following table summarizes the Company's third party and other and direct revenue by category for its three reportable segments for the three months ended March 31, 2014 and 2013 (in thousands):
		North America						EMEA					Rest of World					Consolidated
		Three Months Ended March 31,						Three Months Ended March 31,					Three Months Ended March 31,					Three Months Ended March 31,
		2014			2013			2014		2013			2014			2013		2014		2013
	Local (1):
	Third party and other	$	177,247		$	172,294		$	109,120	$	111,589		$	43,814		$	45,414	$	330,181	$	329,297
	Goods:
	Third party	1,321			3,144			17,475		45,875			36,175			18,062		54,971		67,081
	Direct	236,114			148,065			89,414		7,451			5,680			6,778		331,208		162,294
	Total	237,435			151,209			106,889		53,326			41,855			24,840		386,179		229,375
	Travel:
	Third party	16,380			16,051			14,884		18,883			10,013			7,796		41,277		42,730
	Total revenue	$	431,062		$	339,554		$	230,893	$	183,798		$	95,682		$	78,050	$	757,637	$	601,402
	-1	Includes revenue from deals with local merchants, from deals with national merchants, and through local events.
	The following table summarizes the Company's gross profit by category for its three reportable segments for the three months ended March 31, 2014 and 2013 (in thousands):
		North America						EMEA					Rest of World					Consolidated
		Three Months Ended March 31,						Three Months Ended March 31,					Three Months Ended March 31,					Three Months Ended March 31,
		2014			2013			2014		2013			2014			2013		2014		2013
	Local (1):
	Third party and other	$	152,622		$	146,379		$	100,066	$	97,389		$	34,748		$	39,490	$	287,436	$	283,258
	Goods:
	Third party	1,160			2,669			15,722		39,995			23,516			6,561		40,398		49,225
Direct	11,444			9,787			11,580		(21		)	(1,381		)	151		21,643		9,917
Total	12,604			12,456			27,302		39,974			22,135			6,712		62,041		59,142
Travel:
Third party	14,442			13,521			13,669		16,358			8,133			6,730		36,244		36,609
Total gross profit	$	179,668		$	172,356		$	141,037	$	153,721		$	65,016		$	52,932	$	385,721	$	379,009
-1	Includes gross profit from deals with local merchants, from deals with national merchants, and through local events.

Description_of_Business_and_Ba1

Description of Business and Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2014
Accounting Policies [Abstract]	'
Consolidation, Policy [Policy Text Block]	'
	Principles of Consolidation
	The condensed consolidated financial statements include the accounts of the Company and its subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. The Company's consolidated financial statements were prepared in accordance with U.S. GAAP and include the assets, liabilities, revenue and expenses of all wholly‑owned subsidiaries and majority‑owned subsidiaries over which the Company exercises control and variable interest entities for which the Company has determined that it is the primary beneficiary. Outside stockholders' interests in subsidiaries are shown on the condensed consolidated financial statements as "Noncontrolling interests." Equity investments in entities in which the Company does not have a controlling financial interest are accounted for under either the equity method, the cost method or as available-for-sale securities, as appropriate.
Reclassification, Policy [Policy Text Block]	'
	Reclassifications
	Certain reclassifications have been made to the condensed consolidated financial statements of prior periods and the accompanying notes to conform to the current period presentation.
Use of Estimates, Policy [Policy Text Block]	'
	Use of Estimates
	The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires estimates and assumptions that affect the reported amounts and classifications of assets and liabilities, revenue and expenses, and the related disclosures of contingent liabilities in the condensed consolidated financial statements and accompanying notes. Estimates are utilized for, but not limited to, stock‑based compensation, income taxes, valuation of acquired goodwill and intangible assets, investments, customer refunds, contingent liabilities and the useful lives of property, equipment and software and intangible assets. Actual results could differ materially from those estimates.

Business_Combinations_and_Acqu1

Business Combinations and Acquisitions of Noncontrolling Interests (Tables)	3 Months Ended
	Mar. 31, 2014
Business Combinations [Abstract]	'
Schedule of Business Acquisitions, Consideration Transferred	'
	The aggregate acquisition-date fair value of the consideration transferred for the Ticket Monster acquisition totaled $263.0 million, which consisted of the following (in thousands):
	Cash		$	100,120
	Issuance of 13,825,283 shares of Class A common stock		162,862
	Total		$	262,982
	The aggregate acquisition-date fair value of the consideration transferred for the Ideeli acquisition totaled $42.7 million, which consisted of the following (in thousands):
	Cash		$	42,381
	Liability for purchase consideration		359
	Total		$	42,740
Schedule of Business Acquisitions, Purchase Price Allocation	'
	The following table summarizes the allocation of the aggregate acquisition price of the Ticket Monster acquisition (in thousands):
	Cash and cash equivalents	$	24,768
	Accounts receivable	15,832
	Deferred income taxes	1,264
	Prepaid expenses and other current assets	829
	Property, equipment and software	5,944
	Goodwill	223,850
	Intangible assets:(1)
	Subscriber relationships	57,022
	Merchant relationships	32,176
	Developed technology	571
	Trade name	19,325
	Other non-current assets	3,033
	Total assets acquired	$	384,614
	Accounts payable	$	5,951
	Accrued merchant and supplier payables	82,934
	Accrued expenses	22,334
	Other current liabilities	3,482
	Deferred income taxes, non-current	1,264
	Other non-current liabilities	5,667
	Total liabilities assumed	$	121,632
	Total acquisition price	$	262,982
	-1	The acquired intangible assets have estimated useful lives of between 2 and 5 years.
	The following table summarizes the allocation of the aggregate acquisition price of the Ideeli acquisition (in thousands):
	Cash and cash equivalents	$	79
	Accounts receivable	988
	Deferred income taxes	572
	Prepaid expenses and other current assets	22,081
	Property, equipment and software	8,173
	Goodwill	5,421
	Intangible assets(1):
	Subscriber relationships	5,490
	Brand relationships	7,100
	Trade name	4,500
	Deferred income taxes, non-current	7,753
	Total assets acquired	$	62,157
	Accounts payable	$	1,640
	Accrued supplier payables	4,092
	Accrued expenses	9,118
	Other current liabilities	482
	Deferred income taxes, non-current	332
	Other non-current liabilities	3,753
	Total liabilities assumed	$	19,417
	Total acquisition price	$	42,740
	-1	The acquired intangible assets have estimated useful lives of between 3 and 5 years.
Business Acquisition, Pro Forma Information [Table Text Block]	'
	The following unaudited pro forma information presents the combined operating results of the Company for the three months ended March 31, 2013, as if the Company had acquired Ticket Monster and Ideeli as of January 1, 2013 (in thousands). Pro forma results of operations have not been presented for the three months ended March 31, 2014, because the operating results of Ticket Monster and Ideeli from January 1, 2014 through their respective acquisition dates were not material to the Company's consolidated results of operations for the three months ended March 31, 2014. The underlying pro forma results include the historical financial results of the Company and its two acquired businesses adjusted for depreciation and amortization expense associated with the assets acquired. The unaudited pro forma results do not reflect any operating efficiencies or potential cost savings which may result from the consolidation of the operations of the Company and the acquired entities. Accordingly, these unaudited pro forma results are presented for informational purposes only and are not necessarily indicative of what the actual results of operations of the combined company would have been if the acquisitions had occurred as of January 1, 2013, nor are they indicative of future results of operations.
		Three Months Ended March 31, 2013
	Revenue	$	652,100
	Net loss	(28,424		)

Goodwill_and_Other_Intangible_1

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2014
GOODWILL AND OTHER INTANGIBLE ASSETS [Abstract]	'
Schedule of Goodwill [Table Text Block]	'
	The following table summarizes the Company's goodwill activity by segment for the three months ended March 31, 2014(in thousands):
			North America		EMEA		Rest of World			Consolidated
	Balance as of December 31, 2013		$	85,457	$	115,669	$	19,701		$	220,827
	Goodwill related to acquisitions		5,421		—		223,850			229,271
	Other adjustments(1)		—		14		(2,742		)	(2,728		)
	Balance as of March 31, 2014		$	90,878	$	115,683	$	240,809		$	447,370
	-1	Includes changes in foreign exchange rates for goodwill.
Schedule of Finite-Lived Intangible Assets by Major Class [Table Text Block]	'
	The following tables summarize the Company's other intangible assets (in thousands):
			31-Mar-14
	Asset Category		Gross Carrying Value		Accumulated Amortization		Net Carrying Value
	Subscriber relationships		$	107,348	$	36,578	$	70,770
	Merchant relationships		40,952		11,023		29,929
	Trade names		30,317		7,831		22,486
	Developed technology		23,679		20,918		2,761
	Brand relationships		7,100		395		6,705
	Other intangible assets		16,754		8,667		8,087
	Total		$	226,150	$	85,412	$	140,738
			31-Dec-13
	Asset Category		Gross Carrying Value		Accumulated Amortization		Net Carrying Value
	Subscriber relationships		$	45,541	$	30,866	$	14,675
	Merchant relationships		9,186		7,991		1,195
	Trade names		6,739		6,739		—
	Developed technology		23,038		19,547		3,491
	Other intangible assets		16,776		7,694		9,082
	Total		$	101,280	$	72,837	$	28,443
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	'
	As of March 31, 2014, the Company's estimated future amortization expense related to intangible assets is as follows (in thousands):
	Remaining amounts in 2014		$	33,977
	2015		38,703
	2016		32,176
	2017		18,118
	2018		17,764
	Thereafter		—
			$	140,738

Investments_Tables

Investments (Tables)	3 Months Ended
	Mar. 31, 2014
Investments, All Other Investments [Abstract]	'
Schedule of Cost and Equity Method Investments [Table Text Block]	'
	The following table summarizes the Company's investments (dollars in thousands):
		March 31, 2014		Percent Ownership of Voting Stock						31-Dec-13				Percent Ownership of Voting Stock
	Cost and equity method investments:
	Cost method investments	$	15,416	6	%	to	19	%		$	15,788			6	%	to	19	%
	Equity method investments	1,742		21	%	to	50	%		1,690				21	%	to	50	%
	Total cost and equity method investments	17,158								17,478
	Available-for-sale securities:
	Convertible debt securities	2,693								3,174
	Redeemable preferred shares	4,599		19	%	to	23	%		—				19	%
	Total available-for-sale securities	7,292								3,174
	Total investments	$	24,450							$	20,652
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]	'
	The following table summarizes the amortized cost, gross unrealized loss and fair value of the Company's available-for-sale securities as of March 31, 2014 and December 31, 2013 (in thousands):
		31-Mar-14										31-Dec-13
		Amortized Cost		Gross Unrealized Loss				Fair Value				Amortized Cost				Gross Unrealized Loss			Fair Value
	Available-for-sale securities:
	Convertible debt securities	$	3,370	$	(677	)		$	2,693			$	3,370			$	(196	)	$	3,174
	Redeemable preferred shares	4,599		—				4,599				—				—			—
	Total available-for-sale securities	$	7,969	$	(677	)		$	7,292			$	3,370			$	(196	)	$	3,174

Supplemental_Consolidated_Bala1

Supplemental Consolidated Balance Sheet and Statement of Operations Information (Tables)	3 Months Ended
	Mar. 31, 2014
SUPPLEMENTAL CONSOLIDATED BALANCE SHEET AND STATEMENT OF OPERATIONS INFORMATION [Abstract]	'
Schedule of Other Income (Expense) [Table Text Block]	'
	The following table summarizes the Company's other expense, net for the three months ended March 31, 2014 and 2013 (in thousands):
		Three Months Ended March 31,
		2014			2013
	Interest income	$	376		$	429
	Interest expense	(88		)	(57		)
	Impairment of investment	(397		)	—
	Gain (loss) on equity method investments	52			(19		)
	Foreign exchange and other	(783		)	(5,436		)
	Other expense, net	$	(840	)	$	(5,083	)
Schedule of Prepaid Expenses and Other Current Assets [Table Text Block]	'
	The following table summarizes the Company's prepaid expenses and other current assets as of March 31, 2014 and December 31, 2013 (in thousands):
		31-Mar-14			31-Dec-13
	Current portion of unamortized tax effects on intercompany transactions	$	27,340		$	28,502
	Finished goods inventories	63,323			57,097
	Prepaid expenses	35,409			29,404
	Restricted cash	19,665			14,579
	VAT and income taxes receivable	60,461			52,960
	Prepaid marketing	15,117			17,301
	Other	12,787			10,572
	Total prepaid expenses and other current assets	$	234,102		$	210,415
Schedule of Accrued Merchant and Supplier Payables [Table Text Block]	'
	The following table summarizes the Company's accrued merchant and supplier payables as of March 31, 2014 and December 31, 2013 (in thousands):
		31-Mar-14			31-Dec-13
	Accrued merchant payables	$	615,696		$	518,233
	Accrued supplier payables(1)	200,633			234,710
	Total accrued merchant and supplier payables	$	816,329		$	752,943
	-1	Amounts include payables to suppliers of inventories and providers of shipping and fulfillment services.
Schedule of Accrued Expenses [Table Text Block]	'
	The following table summarizes the Company's accrued expenses as of March 31, 2014 and December 31, 2013 (in thousands):
		31-Mar-14			31-Dec-13
	Marketing	$	16,660		$	12,001
	Refunds reserve	37,720			38,597
	Payroll and benefits	72,150			64,966
	Customer credits	47,799			44,728
	Professional fees	24,730			24,670
	Other	53,956			42,024
	Total accrued expenses	$	253,015		$	226,986
Schedule of Other Current Liabilities [Table Text Block]	'
	The following table summarizes the Company's other current liabilities as of March 31, 2014 and December 31, 2013 (in thousands):
		31-Mar-14			31-Dec-13
	Income taxes payable	$	20,407		$	21,994
	VAT payable	34,095			37,627
	Sales taxes payable	4,934			10,412
	Deferred revenue	59,141			47,259
	Other	15,738			15,426
	Total other current liabilities	$	134,315		$	132,718
Schedule of Other Liabilities, Noncurrent [Table Text Block]	'
	The following table summarizes the Company's other non-current liabilities as of March 31, 2014 and December 31, 2013 (in thousands):
		31-Mar-14			31-Dec-13
	Long-term tax liabilities	$	114,495		$	109,286
	Deferred rent	12,849			9,148
	Other	19,853			13,263
	Total other non-current liabilities	$	147,197		$	131,697
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	'
	The following table summarizes the components of accumulated other comprehensive income as of March 31, 2014 and December 31, 2013 (in thousands):
		March 31, 2014			December 31, 2013
	Foreign currency translation adjustments	$	20,443		$	24,952
	Unrealized loss on available-for-sale securities, net of tax	(423		)	(122		)
	Accumulated other comprehensive income	$	20,020		$	24,830

Commitments_and_Contingencies_

Commitments and Contingencies Operating Leases (Tables)	3 Months Ended
	Mar. 31, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	'
	As of March 31, 2014, estimated future payments under operating leases assumed in connection with the Ticket Monster and Ideeli acquisitions for each of the next five years and thereafter are as follows (in thousands):
		Operating leases
	2014	$	3,958
	2015	5,112
	2016	4,911
	2017	4,326
	2018	2,631
	Thereafter	11,110
	Total minimum lease payments	$	32,048

Stockholders_Equity_and_StockB1

Stockholders' Equity and Stock-Based Compensation Stockholders' Equity Tables (Tables)	3 Months Ended
	Mar. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]	'
	The table below summarizes the stock option activity for the three months ended March 31, 2014:
			Options		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value
								(in thousands) (1)
	Outstanding at December 31, 2013		3,355,054		$	1.11	6.04	$	35,742
	Exercised		(357,291	)	$	1.02
	Forfeited		(3,929	)	$	1.87
	Outstanding at March 31, 2014		2,993,834		$	1.11	5.79	$	20,144
	Exercisable at March 31, 2014		2,743,019		$	0.99	5.73	$	18,788
	-1	The aggregate intrinsic value of options outstanding and exercisable represents the total pretax intrinsic value (the difference between the fair value of the Company's stock on the last day of each period and the exercise price, multiplied by the number of options where the fair value exceeds the exercise price) that would have been received by the option holders had all option holders exercised their options as of March 31, 2014 and December 31, 2013, respectively.
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]	'
	The table below summarizes activity regarding unvested restricted stock units under the Plans during the three months ended March 31, 2014:
			Restricted Stock Units		Weighted- Average Grant Date Fair Value (per share)
	Unvested at December 31, 2013		41,648,055		$	8.06
	Granted		6,657,851		$	10.05
	Vested		(3,819,150	)	$	7.29
	Forfeited		(4,271,952	)	$	8.49
	Unvested at March 31, 2014		40,214,804		$	8.45
Schedule of Nonvested Restricted Stock Units Activity, Acquisition [Table Text Block]	'
	The table below summarizes activity regarding unvested restricted stock for the three months ended March 31, 2014:
			Restricted Stock		Weighted- Average Grant Date Fair Value (per share)
	Unvested at December 31, 2013		97,677		$	14
	Vested		(26,015	)	$	15.78
	Unvested at March 31, 2014		71,662		$	15.93

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2014
FAIR VALUE MEASUREMENTS [Abstract]	'
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	'
	The following tables summarize the Company's assets and liabilities that are measured at fair value on a recurring basis (in thousands):
					Fair Value Measurement at Reporting Date Using
	Description	31-Mar-14			Quoted Prices in Active Markets for			Significant Other			Significant
					Identical Assets			Observable			Unobservable
					(Level 1)			Inputs			Inputs
								(Level 2)			(Level 3)
	Assets:
	Cash equivalents	$	585,536		$	585,536		$	—		$	—
	Available-for-sale securities:
	Convertible debt securities	$	2,693		$	—		$	—		$	2,693
	Redeemable preferred shares	$	4,599		$	—		$	—		$	4,599
					Fair Value Measurement at Reporting Date Using
	Description	31-Dec-13			Quoted Prices in Active Markets for			Significant Other			Significant
					Identical Assets			Observable			Unobservable
					(Level 1)			Inputs			Inputs
								(Level 2)			(Level 3)
	Assets:
	Cash equivalents	$	585,514		$	585,514		$	—		$	—
	Available-for-sale securities:
	Convertible debt securities	$	3,174		$	—		$	—		$	3,174
	Redeemable preferred shares	$	—		$	—		$	—		$	—
	Liabilities:
	Contingent consideration	$	606		$	—		$	—		$	606
Fair Value, Assets and Liabilities, Reconciliation of Level 3 Inputs [Table Text Block]	'
	The following table provides a roll-forward of the fair value of recurring Level 3 fair value measurements for the three months ended March 31, 2014 and 2013 (in thousands):
		Three Months Ended March 31,
		2014			2013
	Assets
	Available-for-sale securities
	Convertible debt securities:
	Beginning Balance	$	3,174		$	3,087
	Total (losses) gains included in other comprehensive (loss) income	(481		)	254
	Ending Balance	$	2,693		$	3,341
	Unrealized losses (gains) still held(1)	$	481		$	(254	)
	Redeemable preferred shares(2):
	Beginning Balance	$	—		$	42,539
	Purchase of redeemable preferred shares	4,599			—
	Ending Balance	$	4,599		$	42,539
	Unrealized (gains) losses still held(1)	$	—		$	—
	Liabilities
	Contingent Consideration:
	Beginning Balance	$	606		$	7,601
	Issuance of contingent consideration in connection with acquisitions	—			30
	Settlements of contingent consideration liabilities	(424		)	—
	Reclass to non-fair value liabilities when no longer contingent	(143		)	—
	Total (gains) losses included in earnings(3)	(39		)	68
	Ending Balance	$	—		$	7,699
	Unrealized (gains) losses still held(1)	$	—		$	68
	-1	Represents the unrealized (gains) losses recorded in earnings or other comprehensive (loss) income during the period for assets and liabilities classified as Level 3 that are still held (or outstanding) at the end of the period.
	-2	For the three months ended March 31, 2013, the Company's investments in Life Media Limited (F-tuan) preferred shares were previously classified as cost method investments and have been reclassified to the available-for-sale category in this table. The balance as of March 31, 2013 represents the Company’s investments in F-tuan preferred shares, which were written down to zero through an other-than-temporary impairment charge as of December 31, 2013 and continue to have an estimated fair value of zero as of March 31, 2014. The $4.6 million balance as of March 31, 2014 represents the Company's investment in the preferred shares of an online home services company during the current period, as described in Note 4 "Investments."
	-3	Changes in the fair value of contingent consideration liabilities are classified within "Acquisition-related expense, net" on the condensed consolidated statements of operations.
Fair Value of Financial Assets and Liabilities not Measured at Fair Value [Table Text Block]	'
	The following table presents the carrying amounts and fair values of financial instruments that are not carried at fair value in the condensed consolidated financial statements (in thousands):
			31-Mar-14						31-Dec-13
			Carrying Amount			Fair Value			Carrying Amount			Fair Value
	Cost method investments		$	15,416		$	15,629		$	15,788		$	15,573

Loss_Per_Share_of_Class_A_and_1

Loss Per Share of Class A and Class B Common Stock (Tables)	3 Months Ended
	Mar. 31, 2014
LOSS PER SHARE OF CLASS A AND CLASS B COMMON STOCK [Abstract] [Abstract]	'
Schedule of Earnings per Share, Basic and Diluted [Table Text Block]	'
	The following table sets forth the computation of basic and diluted loss per share of Class A and Class B common stock for the three months ended March 31, 2014 and 2013 (in thousands, except share amounts and per share amounts):
			Three Months Ended March 31,
			2014						2013
			Class A			Class B			Class A			Class B
	Basic loss per share:
	Numerator
	Allocation of net loss		$	(35,239	)	$	(124	)	$	(3,231	)	$	(11	)
	Less: Allocation of net income attributable to noncontrolling interests		2,423			9			747			3
	Allocation of net loss attributable to common stockholders		$	(37,662	)	$	(133	)	$	(3,978	)	$	(14	)
	Denominator
	Weighted-average common shares outstanding		679,978,714			2,399,976			656,400,441			2,399,976
	Basic loss per share		$	(0.06	)	$	(0.06	)	$	(0.01	)	$	(0.01	)
	Diluted loss per share:
	Numerator
	Allocation of net loss attributable to common stockholders		$	(37,662	)	$	(133	)	$	(3,978	)	$	(14	)
	Reallocation of net income attributable to common stockholders as a result of conversion of Class B(1)		—			—			—			—
	Allocation of net loss attributable to common stockholders		$	(37,662	)	$	(133	)	$	(3,978	)	$	(14	)
	Denominator
	Weighted-average common shares outstanding used in basic computation		679,978,714			2,399,976			656,400,441			2,399,976
	Conversion of Class B(1)		—			—			—			—
	Employee stock options(1)		—			—			—			—
	Restricted shares and RSUs(1)		—			—			—			—
	Weighted-average diluted shares outstanding(1)		679,978,714			2,399,976			656,400,441			2,399,976
	Diluted loss per share		$	(0.06	)	$	(0.06	)	$	(0.01	)	$	(0.01	)
	-1	Conversion of Class B shares into Class A shares and outstanding equity awards have not been reflected in the diluted loss per share calculation for the three months ended March 31, 2014 and 2013 because the effect would be antidilutive.
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	'
	The following outstanding equity awards are not included in the diluted loss per share calculation above because they would have had an antidilutive effect:
		Three Months Ended March 31,
		2014			2013
	Stock options	3,233,467			6,854,309
	Restricted stock units	40,166,021			35,224,459
	Restricted stock	77,008			354,128
	ESPP shares	422,873			568,174
	Total	43,899,369			43,001,070

Segment_Information_Tables

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2014
SEGMENT INFORMATION [Abstract]	'
Schedule of Segment Reporting Information, by Segment [Table Text Block]	'
	Revenue and profit or loss information by reportable segment reconciled to consolidated net loss for the three months ended March 31, 2014 and 2013 were as follows (in thousands):
		Three Months Ended March 31,
		2014			2013
	North America
	Revenue(1)	$	431,062		$	339,554
	Segment cost of revenue and operating expenses(2)	419,677			298,188
	Segment operating income(2)	11,385			41,366
	EMEA
	Revenue(3)	230,893			183,798
	Segment cost of revenue and operating expenses(2)	211,970			149,622
	Segment operating income(2)	18,923			34,176
	Rest of World
	Revenue	95,682			78,050
	Segment cost of revenue and operating expenses(2)	120,429			102,439
	Segment operating loss(2)	(24,747		)	(24,389		)
	Consolidated
	Revenue	757,637			601,402
	Segment cost of revenue and operating expenses(2)	752,076			550,249
	Segment operating income(2)	5,561			51,153
	Stock-based compensation	23,729			29,907
	Acquisition-related expense, net	1,785			68
	(Loss) income from operations	(19,953		)	21,178
	Other expense, net	(840		)	(5,083		)
	(Loss) income before provision for income taxes	(20,793		)	16,095
	Provision for income taxes	14,570			19,337
	Net loss	$	(35,363	)	$	(3,242	)
	-1	North America includes revenue from the United States of $419.9 million and $326.8 million for the three months ended March 31, 2014 and 2013, respectively.
	-2	Segment cost of revenue and operating expenses and segment operating income (loss) exclude stock-based compensation and acquisition-related expense (benefit), net. This presentation corresponds to the measure of segment profit or loss that the Company's chief operating decision maker uses in assessing segment performance and making resource allocation decisions. For the three months ended March 31, 2014 and 2013, stock-based compensation expense was approximately $19.5 million and $22.8 million, respectively, for the North America segment, approximately $2.3 million and $3.1 million, respectively, for the EMEA segment and approximately $2.0 million and $4.0 million, respectively, for the Rest of World segment. For the three months ended March 31, 2014 and 2013, acquisition-related expense, net was approximately $1.6 million and $0.1 million, respectively, for the North America segment and approximately $0.1 million of expense and $0.1 million of benefit, respectively, for the EMEA segment. Acquisition-related expense, net for the North America segment includes gains and losses relating to contingent consideration obligations incurred by U.S. legal entities relating to purchases of businesses that became part of the EMEA and Rest of World segments, which is consistent with the attribution used for internal reporting purposes.
	-3	Beginning in September 2013, direct revenue transactions in the EMEA Goods category have been transacted through a Switzerland-based subsidiary. As a result, EMEA includes revenue from Switzerland of $91.9 million for the three months ended March 31, 2014.
Schedule of Segment Assets [Table Text Block]	'
	The following table summarizes the Company's total assets by reportable segment as of March 31, 2014 and December 31, 2013 (in thousands):
		31-Mar-14			31-Dec-13
	North America (1)	$	1,141,248		$	1,267,158
	EMEA	607,890			616,126
	Rest of World (1)	531,468			158,726
	Consolidated total assets	$	2,280,606		$	2,042,010
	-1	North America contains assets from the United States of $1,123.2 million and $1,231.3 million as of March 31, 2014 and December 31, 2013, respectively. Rest of World contains assets from the Republic of Korea, including those assets acquired as a part of our acquisition of Ticket Monster described in Note 2 "Business Combinations," of $384.4 million as of March 31, 2014. There were no other individual countries that represented more than 10% of consolidated total assets as of March 31, 2014 and December 31, 2013, respectively.
Revenue by Segment and Category [Table Text Block]	'
		North America						EMEA					Rest of World					Consolidated
		Three Months Ended March 31,						Three Months Ended March 31,					Three Months Ended March 31,					Three Months Ended March 31,
		2014			2013			2014		2013			2014			2013		2014		2013
	Local (1):
	Third party and other	$	177,247		$	172,294		$	109,120	$	111,589		$	43,814		$	45,414	$	330,181	$	329,297
	Goods:
	Third party	1,321			3,144			17,475		45,875			36,175			18,062		54,971		67,081
	Direct	236,114			148,065			89,414		7,451			5,680			6,778		331,208		162,294
	Total	237,435			151,209			106,889		53,326			41,855			24,840		386,179		229,375
	Travel:
	Third party	16,380			16,051			14,884		18,883			10,013			7,796		41,277		42,730
	Total revenue	$	431,062		$	339,554		$	230,893	$	183,798		$	95,682		$	78,050	$	757,637	$	601,402
	-1	Includes revenue from deals with local merchants, from deals with national merchants, and through local events
Gross Profit by Segment and Category [Table Text Block]	'
	The following table summarizes the Company's gross profit by category for its three reportable segments for the three months ended March 31, 2014 and 2013 (in thousands):
		North America						EMEA					Rest of World					Consolidated
		Three Months Ended March 31,						Three Months Ended March 31,					Three Months Ended March 31,					Three Months Ended March 31,
		2014			2013			2014		2013			2014			2013		2014		2013
	Local (1):
	Third party and other	$	152,622		$	146,379		$	100,066	$	97,389		$	34,748		$	39,490	$	287,436	$	283,258
	Goods:
	Third party	1,160			2,669			15,722		39,995			23,516			6,561		40,398		49,225
	Direct	11,444			9,787			11,580		(21		)	(1,381		)	151		21,643		9,917
	Total	12,604			12,456			27,302		39,974			22,135			6,712		62,041		59,142
	Travel:
	Third party	14,442			13,521			13,669		16,358			8,133			6,730		36,244		36,609
	Total gross profit	$	179,668		$	172,356		$	141,037	$	153,721		$	65,016		$	52,932	$	385,721	$	379,009
	-1	Includes gross profit from deals with local merchants, from deals with national merchants, and through local events.

Business_Combinations_and_Acqu2

Business Combinations and Acquisitions of Noncontrolling Interests Business Combinations (Details) (USD $)	3 Months Ended
	Mar. 31, 2014
Business Acquisition [Line Items]	'
Common stock issued in connection with acquisition of business, shares	13,825,283
Number of Businesses Acquired	2
Business Acquisition, Transaction Costs	$1,800,000
Ideeli [Member]	'
Consideration Transferred [Abstract]	'
Business Combinations, cash transferred	42,381,000
Business Combination, Consideration Transferred, Liabilities Incurred	359,000
Business Combination, Consideration Transferred	42,740,000
Purchase Price Allocation [Abstract]	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	79,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables	988,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other	572,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	22,081,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	8,173,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	5,421,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Noncurrent	7,753,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	62,157,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable	1,640,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accrued Merchant and Supplier Payables	4,092,000
Business Combinations, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accrued Expenses	9,118,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	482,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent	332,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other	3,753,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	19,417,000
Business Combination, Purchase Price Allocation	42,740,000
Ideeli [Member] | Subscriber Relationships [Member]	'
Purchase Price Allocation [Abstract]	'
Business Combination, intangible assets	5,490,000	[1]
Ideeli [Member] | Brand Relationships [Member]	'
Purchase Price Allocation [Abstract]	'
Business Combination, intangible assets	7,100,000	[1]
Ideeli [Member] | Trade names [Member]	'
Purchase Price Allocation [Abstract]	'
Business Combination, intangible assets	4,500,000	[1]
Ticket Monster [Member]	'
Consideration Transferred [Abstract]	'
Business Combinations, cash transferred	100,120,000
Business Combination, issuance of Class A common stock	162,862,000
Business Combination, Consideration Transferred	262,982,000
Purchase Price Allocation [Abstract]	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	24,768,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables	15,832,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other	1,264,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	829,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	5,944,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	223,850,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	3,033,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	384,614,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable	5,951,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accrued Merchant and Supplier Payables	82,934,000
Business Combinations, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accrued Expenses	22,334,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	3,482,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent	1,264,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other	5,667,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	121,632,000
Business Combination, Purchase Price Allocation	262,982,000
Ticket Monster [Member] | Subscriber Relationships [Member]	'
Purchase Price Allocation [Abstract]	'
Business Combination, intangible assets	57,022,000	[1]
Ticket Monster [Member] | Merchant Relationships [Member]	'
Purchase Price Allocation [Abstract]	'
Business Combination, intangible assets	32,176,000	[1]
Ticket Monster [Member] | Technology-Based Intangible Assets [Member]	'
Purchase Price Allocation [Abstract]	'
Business Combination, intangible assets	571,000	[1]
Ticket Monster [Member] | Trade names [Member]	'
Purchase Price Allocation [Abstract]	'
Business Combination, intangible assets	$19,325,000	[1]
Maximum [Member]	'
Business Acquisition [Line Items]	'
Finite-Lived Intangible Asset, Useful Life	'5 years 0 months 0 days
Minimum [Member]	'
Business Acquisition [Line Items]	'
Finite-Lived Intangible Asset, Useful Life	'1 year 0 months 0 days
Minimum [Member] | Ideeli [Member]	'
Business Acquisition [Line Items]	'
Finite-Lived Intangible Asset, Useful Life	'3 years 0 months 0 days
Minimum [Member] | Ticket Monster [Member]	'
Business Acquisition [Line Items]	'
Finite-Lived Intangible Asset, Useful Life	'2 years 0 months 0 days
[1]	The acquired intangible assets have estimated useful lives of between 2 and 5 years.

Business_Combinations_and_Acqu3

Business Combinations and Acquisitions of Noncontrolling Interests Business Acquisitions, Pro Forma Information (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2014
		Ticket Monster [Member]	Ideeli [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'	'
Business Acquisition, Pro Forma Revenue	$652,100,000	'	'
Business Acquisition, Pro Forma Net Income (Loss)	-28,424,000	'	'
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual	'	-13,600,000	-2,500,000
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual	'	$29,200,000	$15,900,000

Goodwill_and_Other_Intangible_2

Goodwill and Other Intangible Assets Goodwill Activity by Segment (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014
Goodwill [Roll Forward]	'
Goodwill, beginning of period	$220,827
Goodwill, related to acquisitions	229,271
Goodwill, other adjustments	-2,728	[1]
Goodwill, end of period	447,370
North America [Member]	'
Goodwill [Roll Forward]	'
Goodwill, beginning of period	85,457
Goodwill, related to acquisitions	5,421
Goodwill, other adjustments	0	[1]
Goodwill, end of period	90,878
EMEA [Member]	'
Goodwill [Roll Forward]	'
Goodwill, beginning of period	115,669
Goodwill, related to acquisitions	0
Goodwill, other adjustments	14	[1]
Goodwill, end of period	115,683
ROW [Member]	'
Goodwill [Roll Forward]	'
Goodwill, beginning of period	19,701
Goodwill, related to acquisitions	223,850
Goodwill, other adjustments	-2,742	[1]
Goodwill, end of period	$240,809
[1]	(1)Includes changes in foreign exchange rates for goodwill.

Goodwill_and_Other_Intangible_3

Goodwill and Other Intangible Assets Other Intangible Assets (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]	'	'	'
Gross Carrying Value, Intangible Assets	$226,150,000	'	$101,280,000
Accumulated Amortization, Intangible Assets	85,412,000	'	72,837,000
Net Carrying Value, Intangible Assets	140,738,000	'	28,443,000
Amortization of Intangible Assets	12,600,000	5,600,000	'
Subscriber Relationships [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Gross Carrying Value, Intangible Assets	107,348,000	'	45,541,000
Accumulated Amortization, Intangible Assets	36,578,000	'	30,866,000
Net Carrying Value, Intangible Assets	70,770,000	'	14,675,000
Merchant Relationships [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Gross Carrying Value, Intangible Assets	40,952,000	'	9,186,000
Accumulated Amortization, Intangible Assets	11,023,000	'	7,991,000
Net Carrying Value, Intangible Assets	29,929,000	'	1,195,000
Trade names [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Gross Carrying Value, Intangible Assets	30,317,000	'	6,739,000
Accumulated Amortization, Intangible Assets	7,831,000	'	6,739,000
Net Carrying Value, Intangible Assets	22,486,000	'	0
Developed Technology Rights [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Gross Carrying Value, Intangible Assets	23,679,000	'	23,038,000
Accumulated Amortization, Intangible Assets	20,918,000	'	19,547,000
Net Carrying Value, Intangible Assets	2,761,000	'	3,491,000
Brand Relationships [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Gross Carrying Value, Intangible Assets	7,100,000	'	'
Accumulated Amortization, Intangible Assets	395,000	'	'
Net Carrying Value, Intangible Assets	6,705,000	'	'
Other Intangible Assets [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Gross Carrying Value, Intangible Assets	16,754,000	'	16,776,000
Accumulated Amortization, Intangible Assets	8,667,000	'	7,694,000
Net Carrying Value, Intangible Assets	$8,087,000	'	$9,082,000

Goodwill_and_Other_Intangible_4

Goodwill and Other Intangible Assets Estimated Future Amortization Expense (Details) (USD $)	Mar. 31, 2014
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets [Line Items]	'
2014	$33,977
2015	38,703
2016	32,176
2017	18,118
2018	17,764
Thereafter	0
Finite-Lived Intangible Assets, Amortization Expense, Total	$140,738

Investments_Investments_Table_

Investments Investments Table (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Schedule of Cost and Equity Method Investments [Line Items]	'	'
Equity Method Investments	$1,742,000	$1,690,000
Investments, cost and equity method	17,158,000	17,478,000
Available-for-Sale Securities	7,292,000	3,174,000
Available-for-Sale Securities, Ownership Percentage	23.00%	19.00%
Investments	24,450,000	20,652,000
Payments to Acquire Available-for-sale Securities	4,600,000	'
Debt Securities [Member]	'	'
Schedule of Cost and Equity Method Investments [Line Items]	'	'
Available-for-Sale Securities	2,693,000	3,174,000
Redeemable Preferred Stock [Member]	'	'
Schedule of Cost and Equity Method Investments [Line Items]	'	'
Available-for-Sale Securities	4,599,000	0
Cost-method Investments [Member] | Cost-method Investments [Member]	'	'
Schedule of Cost and Equity Method Investments [Line Items]	'	'
Cost Method Investments	$15,416,000	$15,788,000
Maximum [Member]	'	'
Schedule of Cost and Equity Method Investments [Line Items]	'	'
Equity Method Investments, Ownership Percentage	50.00%	50.00%
Available-for-Sale Securities, Ownership Percentage	23.00%	'
Maximum [Member] | Cost-method Investments [Member]	'	'
Schedule of Cost and Equity Method Investments [Line Items]	'	'
Cost Method Investments, Ownership Percentage	19.00%	19.00%
Minimum [Member]	'	'
Schedule of Cost and Equity Method Investments [Line Items]	'	'
Equity Method Investments, Ownership Percentage	21.00%	21.00%
Available-for-Sale Securities, Ownership Percentage	19.00%	'
Minimum [Member] | Cost-method Investments [Member]	'	'
Schedule of Cost and Equity Method Investments [Line Items]	'	'
Cost Method Investments, Ownership Percentage	6.00%	6.00%

Investments_Availableforsale_S

Investments Available-for-sale Securities (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Securities, Amortized Cost Basis	$7,969	$3,370
Available-for-sale Securities, Gross Unrealized Gain (Loss)	-677	-196
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	7,292	3,174
Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Securities, Amortized Cost Basis	3,370	3,370
Available-for-sale Securities, Gross Unrealized Gain (Loss)	-677	-196
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	2,693	3,174
Redeemable Preferred Stock [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Securities, Amortized Cost Basis	4,599	0
Available-for-sale Securities, Gross Unrealized Gain (Loss)	0	0
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	$4,599	$0

Supplemental_Consolidated_Bala2

Supplemental Consolidated Balance Sheet and Statement of Operations Information (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013	Dec. 31, 2013
Interest and Other Income [Abstract]	'		'	'
Interest income	$376		$429	'
Interest Expense	-88		-57	'
Impairment of investment	-397		0	'
(Gain) loss on equity method investments	52		-19	'
Foreign exchange and other	-783		-5,436	'
Other expense, net	-840		-5,083	'
Prepaid Expense and Other Assets, Current [Abstract]	'		'	'
Current portion of unamortized tax effects on intercompany transactions	27,340		'	28,502
Finished goods inventories	63,323		'	57,097
Prepaid expenses	35,409		'	29,404
Restricted cash	19,665		'	14,579
VAT and income taxes receivable	60,461		'	52,960
Prepaid marketing	15,117		'	17,301
Other	12,787		'	10,572
Total prepaid expenses and other current assets	234,102		'	210,415
Merchant and Supplier Payables [Abstract]	'		'	'
Accrued merchant payables	615,696		'	518,233
Accrued supplier payables	200,633	[1]	'	234,710	[1]
Total accrued merchant and supplier payables	816,329		'	752,943
Accrued Expenses [Abstract]	'		'	'
Marketing	16,660		'	12,001
Refunds reserve	37,720		'	38,597
Payroll and benefits	72,150		'	64,966
Customer credits	47,799		'	44,728
Professional fees	24,730		'	24,670
Other	53,956		'	42,024
Total accrued expenses	253,015		'	226,986
Current liabilities [Abstract]:	'		'	'
Income taxes payable	20,407		'	21,994
VAT payable	34,095		'	37,627
Sales taxes payable	4,934		'	10,412
Deferred revenue	59,141		'	47,259
Other	15,738		'	15,426
Total other current liabilities	134,315		'	132,718
Liabilities, Noncurrent [Abstract]	'		'	'
Long-term tax liabilities	114,495		'	109,286
Deferred rent	12,849		'	9,148
Other	19,853		'	13,263
Total other non-current liabilities	147,197		'	131,697
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]	'		'	'
Foreign currency translation adjustments	20,443		'	24,952
Unrealized loss on available-for-sale securities, net of tax	-423		'	-122
Accumulated other comprehensive income	$20,020		'	$24,830
[1]	(1)Amounts include payables to suppliers of inventories and providers of shipping and fulfillment services.

Commitments_and_Contingencies_1

Commitments and Contingencies Operating Leases (Details) (USD $)	Mar. 31, 2014
In Thousands, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]	'
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$3,958
Operating Leases, Future Minimum Payments, Due in Two Years	5,112
Operating Leases, Future Minimum Payments, Due in Three Years	4,911
Operating Leases, Future Minimum Payments, Due in Four Years	4,326
Operating Leases, Future Minimum Payments, Due in Five Years	2,631
Operating Leases, Future Minimum Payments, Due Thereafter	11,110
Operating Leases, Future Minimum Payments Due	$32,048

Commitments_and_Contingencies_2

Commitments and Contingencies Legal Matters (Details) (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2011
COMMITMENTS AND CONTINGENCIES [Abstract]	'	'
Restatement of Prior Year Revenue	'	$14.30
Restatement of Prior Year Operating Income	'	30
Restatement of Prior Year Income, Net of Tax	'	22.6
Impact of Restatement on Earnings Per Share, Basic	'	$0.04
Litigation Settlement, Expense	$8.50	'

Stockholders_Equity_and_StockB2

Stockholders' Equity and Stock-Based Compensation Initial Public Offering, Convertible Preferred Stock and Common Stock (Details)	12 Months Ended
	Dec. 31, 2012
	NumberofClasses
Classes of common stock, number	3

Stockholders_Equity_and_StockB3

Stockholders' Equity and Stock-Based Compensation Repurchase Program (Details) (USD $)	3 Months Ended	9 Months Ended
	Mar. 31, 2014	Sep. 30, 2013
Employee Stock Purchase Plan [Line Items]	'	'
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$224,000,000	'
Common Class A [Member]	'	'
Employee Stock Purchase Plan [Line Items]	'	'
Stock Repurchase Program, Authorized Amount	'	300,000,000
Stock Repurchased During Period, Shares	-3,075,700	'
Stock Repurchased During Period, Value	($29,461,000)	'

Stockholders_Equity_and_StockB4

Stockholders' Equity and Stock-Based Compensation Groupon, Inc. Stock Plans (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	18,692,035	'
Stock-based compensation	$23,729,000	$29,907,000
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount	2,300,000	2,600,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$229,800,000	'
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	'1 year 6 months 0 days	'

Stockholders_Equity_and_StockB5

Stockholders' Equity and Stock-Based Compensation Employee Stock Purchase Plan (Details)	Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Employee Stock Purchase Plan, shares authorized	10,000,000	'
Employee Stock Purchase Plan, shares issued	333,824	271,402

Stockholders_Equity_and_StockB6

Stockholders' Equity and Stock-Based Compensation Stock Option Activity (Details) (Stock Options [Member], USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Stock Options [Member]	'	'
Options [Abstract]	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	3,355,054	'
Exercise of stock options, shares	-357,291	'
Stock Issued During Period, Shares, Share-based Compensation, Forfeited	-3,929	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	2,993,834	3,355,054
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	2,743,019	'
Weighted-Average Exercise Price [Abstract]	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$1.11	'
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$1.02	'
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price	$1.87	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$1.11	$1.11
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$0.99	'
Weighted Average Remaining Contractual Term [Abstract]	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	'5 years 9 months 15 days	'6 years 0 months 15 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	'5 years 9 months 15 days	'6 years 0 months 15 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	'5 years 8 months 23 days	'
Aggregate Intrinsic Value [Abstract]	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$35,742	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	20,144	35,742
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$18,788	'

Stockholders_Equity_and_StockB7

Stockholders' Equity and Stock-Based Compensation Restricted Stock Unit Activity (Details) (Restricted Stock Units (RSUs) [Member], USD $)	3 Months Ended
	Mar. 31, 2014
Restricted Stock Units (RSUs) [Member]	'
Restricted Stock Units [Abstract]	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	41,648,055
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	6,657,851
RSU, Vested in Period	-3,819,150
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	-4,271,952
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	40,214,804
Weighted Average Grant Date Fair Value [Abstract]	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$8.06
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$10.05
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$7.29
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$8.49
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$8.45

Stockholders_Equity_and_StockB8

Stockholders' Equity and Stock-Based Compensation Performance Share Unit Activity (Details) (Performance Shares [Member], USD $)	3 Months Ended
	Mar. 31, 2014
Performance Shares [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$8.07
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	2,000,000

Stockholders_Equity_and_StockB9

Stockholders' Equity and Stock-Based Compensation Restricted Stock, Acquired (Details) (Restricted Stock Units (RSUs) [Member], USD $)	3 Months Ended
	Mar. 31, 2014
Restricted Stock [Abstract]	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	41,648,055
RSU, Vested in Period	3,819,150
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	40,214,804
Weighted Average Grant Date Fair Value [Abstract]	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$8.06
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$7.29
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$8.45
City Deal [Member]	'
Restricted Stock [Abstract]	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	97,677
RSU, Vested in Period	-26,015
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	71,662
Weighted Average Grant Date Fair Value [Abstract]	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$14
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$15.78
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$15.93

Income_Taxes_Text_Details

Income Taxes Text (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Mar. 31, 2014
			Prepaid Expenses and Other Current Assets [Member]	Prepaid Expenses and Other Current Assets [Member]	Other Assets [Member]	Other Assets [Member]	Future amortization through 2014 [Member]	Future amortization through 2015 [Member]
Income before provision for income taxes	($20,793,000)	$16,095,000	'	'	'	'	'	'
Provision for income taxes	14,570,000	19,337,000	'	'	'	'	'	'
Prepaid Taxes	'	'	$27,300,000	$28,500,000	$13,600,000	$20,400,000	$20,600,000	$20,300,000
Effective Income Tax Rate Reconciliation, Percent	-70.10%	120.10%	'	'	'	'	'	'
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	'	'	'	'	'	'	'

Fair_Value_Measurements_Fair_V

Fair Value Measurements Fair Value, Assets and Liabilities Measured at Fair Value (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-Sale Securities	$7,292	$3,174
Fair Value, Measurements, Recurring [Member] | Fair Value [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Cash and Cash Equivalents, Fair Value Disclosure	585,536	585,514
Available-for-Sale Securities	'	3,174
Contingent Consideration, Fair Value Disclosure	'	606
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Cash and Cash Equivalents, Fair Value Disclosure	585,536	585,514
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-Sale Securities	'	3,174
Contingent Consideration, Fair Value Disclosure	'	606
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-Sale Securities	2,693	'
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-Sale Securities	2,693	'
Redeemable Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-Sale Securities	4,599	'
Redeemable Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-Sale Securities	$4,599	'

Fair_Value_Measurements_Fair_V1

Fair Value Measurements Fair Value, Reconciliation of Level 3 - Assets (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'
Purchase of redeemable preferred shares	$4,599	$0
Convertible Debt Securities [Member]	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'
AFS Securities, Beginning Asset Value	3,174	3,087
AFS Debt Security, (losses) included in OCI	-481	254
AFS Securities, Ending Asset Value	2,693	3,341
Unrealized (Gains) Losses Still Held - Assets	481	-254
Redeemable Preferred Stock [Member]	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'
AFS Securities, Beginning Asset Value	0	42,539
AFS Securities, Ending Asset Value	4,599	42,539
Unrealized (Gains) Losses Still Held - Assets	$0	$0

Fair_Value_Measurements_Fair_V2

Fair Value Measurements Fair Value, Reconciliation of Level 3 - Liabilities (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'
Contingent Consideration, Beginning Value	$606	$7,601
Contingent Consideration, Issuances	0	30
Contingent Consideration, Settlements	-424	0
Contingent Consideration, Reclass	-143	0
(Gain) loss, net from changes in fair value of contingent consideration	-39	68
Contingent Consideration, Ending Value	0	7,699
Contingent Consideration, Unrealized Gain Loss	$0	$68

Fair_Value_Measurements_Financ

Fair Value Measurements Financial Assets and Liabilities, Not Measured at Fair Value (Details) (Cost-method Investments [Member], USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Cost Method Investments, Fair Value Disclosure	$15,629	$15,573
Cost-method Investments [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Cost Method Investments	$15,416	$15,788

Loss_Per_Share_of_Class_A_and_2

Loss Per Share of Class A and Class B Common Stock Basic and Diluted Earnings Per Share, 2013, 2012 and 2011 (Details) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013
Earnings Per Share, Basic [Abstract]	'		'
Net loss	($35,363)		($3,242)
Net income attributable to noncontrolling interests	2,432		750
Basic, weighted average number of shares outstanding	682,378,690		658,800,417
Basic, net (loss) earnings per share	($0.06)		($0.01)
Earnings Per Share, Diluted [Abstract]	'		'
Basic, weighted average number of shares outstanding	682,378,690		658,800,417
Diluted, weighted average number of shares outstanding	682,378,690		658,800,417
Diluted, net (loss) earnings per share	($0.06)		($0.01)
Common Class A [Member]	'		'
Earnings Per Share, Basic [Abstract]	'		'
Net loss	-35,239		-3,231
Net income attributable to noncontrolling interests	2,423		747
Net (loss) income attributable to common stockholders	-37,662		-3,978
Basic, weighted average number of shares outstanding	679,978,714		656,400,441
Basic, net (loss) earnings per share	($0.06)		($0.01)
Earnings Per Share, Diluted [Abstract]	'		'
Net Income (Loss) Available to Common Stockholders, Diluted	-37,662		-3,978
Reallocation of net income attributable to common stockholders as a result of conversion of Class B	0	[1]	0	[1]
Allocation of net income attributable to common stockholders	-37,662		-3,978
Basic, weighted average number of shares outstanding	679,978,714		656,400,441
Conversion of Class B	0	[1]	0	[1]
Employee stock options	0	[1]	0	[1]
Restricted shares and RSUs	0	[1]	0	[1]
Diluted, weighted average number of shares outstanding	679,978,714	[1]	656,400,441	[1]
Diluted, net (loss) earnings per share	($0.06)		($0.01)
Common Class B [Member]	'		'
Earnings Per Share, Basic [Abstract]	'		'
Net loss	-124		-11
Net income attributable to noncontrolling interests	9		3
Net (loss) income attributable to common stockholders	-133		-14
Basic, weighted average number of shares outstanding	2,399,976		2,399,976
Basic, net (loss) earnings per share	($0.06)		($0.01)
Earnings Per Share, Diluted [Abstract]	'		'
Net Income (Loss) Available to Common Stockholders, Diluted	-133		-14
Reallocation of net income attributable to common stockholders as a result of conversion of Class B	0	[1]	0	[1]
Allocation of net income attributable to common stockholders	($133)		($14)
Basic, weighted average number of shares outstanding	2,399,976		2,399,976
Conversion of Class B	0	[1]	0	[1]
Employee stock options	0	[1]	0	[1]
Restricted shares and RSUs	0	[1]	0	[1]
Diluted, weighted average number of shares outstanding	2,399,976	[1]	2,399,976	[1]
Diluted, net (loss) earnings per share	($0.06)		($0.01)
[1]	Conversion of Class B shares into Class A shares and outstanding equity awards have not been reflected in the diluted loss per share calculation for the three months ended March 31, 2014 and 2013 because the effect would be antidilutive.

Loss_Per_Share_of_Class_A_and_3

Loss Per Share of Class A and Class B Common Stock Schedule of Equity Antidilutive Securities (Details)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Performance share units	2,000,000	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	43,899,369	43,001,070
Stock Options [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	3,233,467	6,854,309
Restricted Stock Units (RSUs) [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	40,166,021	35,224,459
Restricted Stock [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	77,008	354,128
Employee Stock [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	422,873	568,174

Segment_Information_Details

Segment Information (Details) (USD $)	3 Months Ended				12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]	'		'		'
Number of Reportable Segments	3		'		2
Total revenue	$757,637		$601,402		'
Segment Cost of Revenue and Operating Expenses	752,076	[1]	550,249	[1]	'
Segment operating income (loss)	5,561	[1]	51,153	[1]	'
Stock-based compensation	23,729		29,907		'
Acquisition-related expense, net	1,785		68		'
(Loss) Income from operations	-19,953		21,178		'
Other expense, net	-840		-5,083		'
Income before provision for income taxes	-20,793		16,095		'
Provision for income taxes	14,570		19,337		'
Net loss	-35,363		-3,242		'
North America [Member]	'		'		'
Segment Reporting Information [Line Items]	'		'		'
Total revenue	431,062	[2]	339,554	[2]	'
Segment Cost of Revenue and Operating Expenses	419,677	[1]	298,188	[1]	'
Segment operating income (loss)	11,385	[1]	41,366	[1]	'
Stock-based compensation	19,500		22,800		'
Acquisition-related expense, net	1,600		100		'
EMEA [Member]	'		'		'
Segment Reporting Information [Line Items]	'		'		'
Total revenue	230,893	[3]	183,798	[3]	'
Segment Cost of Revenue and Operating Expenses	211,970	[1]	149,622	[1]	'
Segment operating income (loss)	18,923	[1]	34,176	[1]	'
Stock-based compensation	2,300		3,100		'
Acquisition-related expense, net	100		-100		'
ROW [Member]	'		'		'
Segment Reporting Information [Line Items]	'		'		'
Total revenue	95,682		78,050		'
Segment Cost of Revenue and Operating Expenses	120,429	[1]	102,439	[1]	'
Segment operating income (loss)	-24,747	[1]	-24,389	[1]	'
Stock-based compensation	2,000		4,000		'
United States [Member]	'		'		'
Segment Reporting Information [Line Items]	'		'		'
Total revenue	419,900		326,800		'
Switzerland [Member]	'		'		'
Segment Reporting Information [Line Items]	'		'		'
Total revenue	$91,900		'		'
[1]	Segment cost of revenue and operating expenses and segment operating income (loss) exclude stock-based compensation and acquisition-related expense (benefit), net. This presentation corresponds to the measure of segment profit or loss that the Company's chief operating decision maker uses in assessing segment performance and making resource allocation decisions. For the three months ended March 31, 2014 and 2013, stock-based compensation expense was approximately $19.5 million and $22.8 million, respectively, for the North America segment, approximately $2.3 million and $3.1 million, respectively, for the EMEA segment and approximately $2.0 million and $4.0 million, respectively, for the Rest of World segment. For the three months ended March 31, 2014 and 2013, acquisition-related expense, net was approximately $1.6 million and $0.1 million, respectively, for the North America segment and approximately $0.1 million of expense and $0.1 million of benefit, respectively, for the EMEA segment. Acquisition-related expense, net for the North America segment includes gains and losses relating to contingent consideration obligations incurred by U.S. legal entities relating to purchases of businesses that became part of the EMEA and Rest of World segments, which is consistent with the attribution used for internal reporting purposes.
[2]	North America includes revenue from the United States of $419.9 million and $326.8 million for the three months ended March 31, 2014 and 2013, respectively.
[3]	(3)Beginning in September 2013, direct revenue transactions in the EMEA Goods category have been transacted through a Switzerland-based subsidiary. As a result, EMEA includes revenue from Switzerland of $91.9 million for the three months ended March 31, 2014.

Segment_Information_Total_Asse

Segment Information Total Assets (Details) (USD $)

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

In Thousands, unless otherwise specified

North America [Member]

North America [Member]

EMEA [Member]

EMEA [Member]

ROW [Member]

ROW [Member]

United States [Member]

United States [Member]

Korea [Member]

Assets, Total [Member]

Segment Reporting Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Total Assets

$2,280,606

$2,042,010

$1,141,248

[1]

$1,267,158

[1]

$607,890

$616,126

$531,468

$158,726

$1,123,200

$1,231,300

$384,400

'

Concentration of risk, percentage

'

'

'

'

'

'

'

'

'

'

'

10.00%

[1]

(1)North America contains assets from the United States of $1,123.2 million and $1,231.3 million as of March 31, 2014 and December 31, 2013, respectively. Rest of World contains assets from the Republic of Korea, including those assets acquired as a part of our acquisition of Ticket Monster described in Note 2 "Business Combinations," of $384.4 million as of March 31, 2014. There were no other individual countries that represented more than 10% of consolidated total assets as of March 31, 2014 and December 31, 2013, respectively.

Segment_Information_Revenue_by

Segment Information Revenue by Segment and Category (Details) (USD $)	3 Months Ended				12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2012
Primary Categories	3		'		'
Number of Reportable Segments	3		'		2
Third party and other	$426,429		$439,108		'
Direct	331,208		162,294		'
Total revenue	757,637		601,402		'
North America [Member]	'		'		'
Total revenue	431,062	[1]	339,554	[1]	'
EMEA [Member]	'		'		'
Total revenue	230,893	[2]	183,798	[2]	'
ROW [Member]	'		'		'
Total revenue	95,682		78,050		'
Local [Member]	'		'		'
Third party and other	330,181	[3]	329,297	[3]	'
Local [Member] | North America [Member]	'		'		'
Third party and other	177,247	[3]	172,294	[3]	'
Local [Member] | EMEA [Member]	'		'		'
Third party and other	109,120	[3]	111,589	[3]	'
Local [Member] | ROW [Member]	'		'		'
Third party and other	43,814	[3]	45,414	[3]	'
Goods [Member]	'		'		'
Third party and other	54,971		67,081		'
Direct	331,208		162,294		'
Total revenue	386,179		229,375		'
Goods [Member] | North America [Member]	'		'		'
Third party and other	1,321		3,144		'
Direct	236,114		148,065		'
Total revenue	237,435		151,209		'
Goods [Member] | EMEA [Member]	'		'		'
Third party and other	17,475		45,875		'
Direct	89,414		7,451		'
Total revenue	106,889		53,326		'
Goods [Member] | ROW [Member]	'		'		'
Third party and other	36,175		18,062		'
Direct	5,680		6,778		'
Total revenue	41,855		24,840		'
Travel and other [Member]	'		'		'
Third party and other	41,277		42,730		'
Travel and other [Member] | North America [Member]	'		'		'
Third party and other	16,380		16,051		'
Travel and other [Member] | EMEA [Member]	'		'		'
Third party and other	14,884		18,883		'
Travel and other [Member] | ROW [Member]	'		'		'
Third party and other	$10,013		$7,796		'
[1]	North America includes revenue from the United States of $419.9 million and $326.8 million for the three months ended March 31, 2014 and 2013, respectively.
[2]	(3)Beginning in September 2013, direct revenue transactions in the EMEA Goods category have been transacted through a Switzerland-based subsidiary. As a result, EMEA includes revenue from Switzerland of $91.9 million for the three months ended March 31, 2014.
[3]	Includes revenue from deals with local merchants, from deals with national merchants, and through local events.

Segment_Information_Gross_Prof

Segment Information Gross Profit by Segment and Category (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013
Gross Profit by Category [Line Items]	'		'
Gross Profit	$385,721		$379,009
North America [Member]	'		'
Gross Profit by Category [Line Items]	'		'
Gross Profit	179,668		172,356
EMEA [Member]	'		'
Gross Profit by Category [Line Items]	'		'
Gross Profit	141,037		153,721
ROW [Member]	'		'
Gross Profit by Category [Line Items]	'		'
Gross Profit	65,016		52,932
Local [Member] | Third party and other [Member]	'		'
Gross Profit by Category [Line Items]	'		'
Gross Profit	287,436	[1]	283,258	[1]
Local [Member] | North America [Member] | Third party and other [Member]	'		'
Gross Profit by Category [Line Items]	'		'
Gross Profit	152,622	[1]	146,379	[1]
Local [Member] | EMEA [Member] | Third party and other [Member]	'		'
Gross Profit by Category [Line Items]	'		'
Gross Profit	100,066	[1]	97,389	[1]
Local [Member] | ROW [Member] | Third party and other [Member]	'		'
Gross Profit by Category [Line Items]	'		'
Gross Profit	34,748	[1]	39,490	[1]
Goods [Member]	'		'
Gross Profit by Category [Line Items]	'		'
Gross Profit	62,041		59,142
Goods [Member] | Third party and other [Member]	'		'
Gross Profit by Category [Line Items]	'		'
Gross Profit	40,398		49,225
Goods [Member] | Direct [Member]	'		'
Gross Profit by Category [Line Items]	'		'
Gross Profit	21,643		9,917
Goods [Member] | North America [Member]	'		'
Gross Profit by Category [Line Items]	'		'
Gross Profit	12,604		12,456
Goods [Member] | North America [Member] | Third party and other [Member]	'		'
Gross Profit by Category [Line Items]	'		'
Gross Profit	1,160		2,669
Goods [Member] | North America [Member] | Direct [Member]	'		'
Gross Profit by Category [Line Items]	'		'
Gross Profit	11,444		9,787
Goods [Member] | EMEA [Member]	'		'
Gross Profit by Category [Line Items]	'		'
Gross Profit	27,302		39,974
Goods [Member] | EMEA [Member] | Third party and other [Member]	'		'
Gross Profit by Category [Line Items]	'		'
Gross Profit	15,722		39,995
Goods [Member] | EMEA [Member] | Direct [Member]	'		'
Gross Profit by Category [Line Items]	'		'
Gross Profit	11,580		-21
Goods [Member] | ROW [Member]	'		'
Gross Profit by Category [Line Items]	'		'
Gross Profit	22,135		6,712
Goods [Member] | ROW [Member] | Third party and other [Member]	'		'
Gross Profit by Category [Line Items]	'		'
Gross Profit	23,516		6,561
Goods [Member] | ROW [Member] | Direct [Member]	'		'
Gross Profit by Category [Line Items]	'		'
Gross Profit	-1,381		151
Travel and other [Member] | Third party and other [Member]	'		'
Gross Profit by Category [Line Items]	'		'
Gross Profit	36,244		36,609
Travel and other [Member] | North America [Member] | Third party and other [Member]	'		'
Gross Profit by Category [Line Items]	'		'
Gross Profit	14,442		13,521
Travel and other [Member] | EMEA [Member] | Third party and other [Member]	'		'
Gross Profit by Category [Line Items]	'		'
Gross Profit	13,669		16,358
Travel and other [Member] | ROW [Member] | Third party and other [Member]	'		'
Gross Profit by Category [Line Items]	'		'
Gross Profit	$8,133		$6,730
[1]	Includes gross profit from deals with local merchants, from deals with national merchants, and through local events.