Segment Information Gross Profit by Segment and Category (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Gross Profit by Category [Line Items]
Gross Profit, Services		$ 263,758	$ 277,747	$ 534,734	$ 569,137
Gross Profit		333,588	337,007	672,916	684,413
North America [Member]
Gross Profit by Category [Line Items]
Gross Profit, Services		175,146	165,959	354,876	336,526
Gross Profit		217,174	196,557	433,117	391,047
EMEA [Member]
Gross Profit by Category [Line Items]
Gross Profit, Services		66,633	82,209	135,111	171,965
Gross Profit		90,158	104,087	185,048	219,324
ROW [Member]
Gross Profit by Category [Line Items]
Gross Profit, Services		21,979	29,579	44,747	60,646
Gross Profit		26,256	36,363	54,751	74,042
Local [Member] | Third party and other [Member]
Gross Profit by Category [Line Items]
Gross Profit	[1]	234,400	242,411	475,452	500,704
Local [Member] | North America [Member] | Third party and other [Member]
Gross Profit by Category [Line Items]
Gross Profit	[1]	158,812	147,574	322,830	302,350
Local [Member] | EMEA [Member] | Third party and other [Member]
Gross Profit by Category [Line Items]
Gross Profit	[1]	56,849	70,270	115,112	147,626
Local [Member] | ROW [Member] | Third party and other [Member]
Gross Profit by Category [Line Items]
Gross Profit	[1]	18,739	24,567	37,510	50,728
Goods [Member]
Gross Profit by Category [Line Items]
Gross Profit		69,830	59,260	138,182	115,276
Goods [Member] | Third party and other [Member]
Gross Profit by Category [Line Items]
Gross Profit		10,571	15,554	27,382	32,588
Goods [Member] | Direct [Member]
Gross Profit by Category [Line Items]
Gross Profit		59,259	43,706	110,800	82,688
Goods [Member] | North America [Member]
Gross Profit by Category [Line Items]
Gross Profit		42,028	30,598	78,241	54,521
Goods [Member] | North America [Member] | Third party and other [Member]
Gross Profit by Category [Line Items]
Gross Profit		2,019	1,408	3,692	1,842
Goods [Member] | North America [Member] | Direct [Member]
Gross Profit by Category [Line Items]
Gross Profit		40,009	29,190	74,549	52,679
Goods [Member] | EMEA [Member]
Gross Profit by Category [Line Items]
Gross Profit		23,525	21,878	49,937	47,359
Goods [Member] | EMEA [Member] | Third party and other [Member]
Gross Profit by Category [Line Items]
Gross Profit		4,426	7,779	13,871	17,972
Goods [Member] | EMEA [Member] | Direct [Member]
Gross Profit by Category [Line Items]
Gross Profit		19,099	14,099	36,066	29,387
Goods [Member] | ROW [Member]
Gross Profit by Category [Line Items]
Gross Profit		4,277	6,784	10,004	13,396
Goods [Member] | ROW [Member] | Third party and other [Member]
Gross Profit by Category [Line Items]
Gross Profit		4,126	6,367	9,819	12,774
Goods [Member] | ROW [Member] | Direct [Member]
Gross Profit by Category [Line Items]
Gross Profit		151	417	185	622
Travel [Member] | Third party and other [Member]
Gross Profit by Category [Line Items]
Gross Profit		29,358	35,336	59,282	68,433
Travel [Member] | North America [Member] | Third party and other [Member]
Gross Profit by Category [Line Items]
Gross Profit		16,334	18,385	32,046	34,176
Travel [Member] | EMEA [Member] | Third party and other [Member]
Gross Profit by Category [Line Items]
Gross Profit		9,784	11,939	19,999	24,339
Travel [Member] | ROW [Member] | Third party and other [Member]
Gross Profit by Category [Line Items]
Gross Profit		$ 3,240	$ 5,012	$ 7,237	$ 9,918

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