Segment Information Revenue by Segment and Category (Details) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)
Gross Profit		$ 333,588	$ 337,007	$ 672,916	$ 684,413
Gross Profit, Services		263,758	277,747	$ 534,734	569,137
Primary Categories				3
Third party and other		318,129	340,846	$ 652,697	700,967
Revenue, services		303,647	317,924	616,909	652,806
Direct		437,901	397,549	835,304	787,784
Total revenue		756,030	738,395	1,488,001	1,488,751
North America [Member]
Gross Profit		217,174	196,557	433,117	391,047
Gross Profit, Services		175,146	165,959	354,876	336,526
Revenue, services		205,540	194,419	418,607	395,272
Total revenue	[1]	516,922	481,282	1,017,735	961,164
EMEA [Member]
Gross Profit		90,158	104,087	185,048	219,324
Gross Profit, Services		66,633	82,209	135,111	171,965
Revenue, services		71,325	88,643	144,389	185,896
Total revenue	[1]	198,305	204,047	387,275	420,267
ROW [Member]
Gross Profit		26,256	36,363	54,751	74,042
Gross Profit, Services		21,979	29,579	44,747	60,646
Revenue, services		26,782	34,862	53,913	71,638
Total revenue		40,803	53,066	82,991	107,320
Local [Member]
Third party and other	[2]	267,216	276,503	543,337	570,184
Local [Member] | North America [Member]
Third party and other	[2]	184,139	172,461	376,292	353,325
Local [Member] | EMEA [Member]
Third party and other	[2]	60,616	75,543	122,502	158,079
Local [Member] | ROW [Member]
Third party and other	[2]	22,461	28,499	44,543	58,780
Travel [Member]
Third party and other		36,431	41,421	73,572	82,622
Travel [Member] | North America [Member]
Third party and other		21,401	21,958	42,315	41,947
Travel [Member] | EMEA [Member]
Third party and other		10,709	13,100	21,887	27,817
Travel [Member] | ROW [Member]
Third party and other		4,321	6,363	9,370	12,858
Goods [Member]
Gross Profit		69,830	59,260	138,182	115,276
Third party and other		14,482	22,922	35,788	48,161
Direct		437,901	397,549	835,304	787,784
Total revenue		452,383	420,471	871,092	835,945
Goods [Member] | North America [Member]
Gross Profit		42,028	30,598	78,241	54,521
Third party and other		2,364	1,671	4,354	2,319
Direct		309,018	285,192	594,774	563,573
Total revenue		311,382	286,863	599,128	565,892
Goods [Member] | EMEA [Member]
Gross Profit		23,525	21,878	49,937	47,359
Third party and other		5,317	9,702	16,003	21,680
Direct		121,663	105,702	226,883	212,691
Total revenue		126,980	115,404	242,886	234,371
Goods [Member] | ROW [Member]
Gross Profit		4,277	6,784	10,004	13,396
Third party and other		6,801	11,549	15,431	24,162
Direct		7,220	6,655	13,647	11,520
Total revenue		14,021	18,204	29,078	35,682
Third party and other [Member] | Local [Member]
Gross Profit	[3]	234,400	242,411	475,452	500,704
Third party and other [Member] | Local [Member] | North America [Member]
Gross Profit	[3]	158,812	147,574	322,830	302,350
Third party and other [Member] | Local [Member] | EMEA [Member]
Gross Profit	[3]	56,849	70,270	115,112	147,626
Third party and other [Member] | Local [Member] | ROW [Member]
Gross Profit	[3]	18,739	24,567	37,510	50,728
Third party and other [Member] | Travel [Member]
Gross Profit		29,358	35,336	59,282	68,433
Third party and other [Member] | Travel [Member] | North America [Member]
Gross Profit		16,334	18,385	32,046	34,176
Third party and other [Member] | Travel [Member] | EMEA [Member]
Gross Profit		9,784	11,939	19,999	24,339
Third party and other [Member] | Travel [Member] | ROW [Member]
Gross Profit		3,240	5,012	7,237	9,918
Third party and other [Member] | Goods [Member]
Gross Profit		10,571	15,554	27,382	32,588
Third party and other [Member] | Goods [Member] | North America [Member]
Gross Profit		2,019	1,408	3,692	1,842
Third party and other [Member] | Goods [Member] | EMEA [Member]
Gross Profit		4,426	7,779	13,871	17,972
Third party and other [Member] | Goods [Member] | ROW [Member]
Gross Profit		4,126	$ 6,367	$ 9,819	$ 12,774
Sales Revenue, Net [Member]
Concentration of risk, percentage			0.00%	10.00%	0.00%
United States
Total revenue		508,800	$ 474,500	$ 1,001,400	$ 947,600
SWITZERLAND
Total revenue		$ 130,200	$ 113,700	$ 243,500	$ 231,200

[1] North America includes revenue from the United States of $508.8 million and $474.5 million for the three months ended June 30, 2016 and 2015, respectively, and $1,001.4 million and $947.6 million for the six months ended June 30, 2016 and 2015, respectively. EMEA includes revenue from Switzerland of $130.2 million and $113.7 million for the three months ended June 30, 2016 and 2015, respectively, and $243.5 million and $231.2 million for the six months ended June 30, 2016 and 2015, respectively. There were no other individual countries that represented more than 10% of consolidated total revenue for the three and six months ended June 30, 2016 and 2015.

[2] Includes revenue from deals with local and national merchants and through local events.

[3] Includes gross profit from deals with local and national merchants and through local events.