SEGMENT INFORMATION - Schedule of Revenue by Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Revenue by Segment [Line Items]
Stock-based compensation									$ 81,615	$ 64,821	$ 82,044
Total revenue									2,218,915	2,636,746	2,843,877
Revenues	$ 612,316	$ 495,612	$ 532,577	$ 578,410	$ 799,927	$ 592,883	$ 617,396	$ 626,540
North America
Schedule of Revenue by Segment [Line Items]
Stock-based compensation									72,800	59,700	76,100
Total revenue									1,358,907	1,639,395	1,914,168
International
Schedule of Revenue by Segment [Line Items]
Stock-based compensation									8,800	5,000	5,700
Total revenue									860,008	997,351	929,709
UNITED STATES
Schedule of Revenue by Segment [Line Items]
Revenues									1,333,900	1,600,200	1,884,700
UNITED KINGDOM
Schedule of Revenue by Segment [Line Items]
Revenues									314,300	390,400	343,900
Product
Schedule of Revenue by Segment [Line Items]
Total revenue									1,092,558	1,431,259	1,577,425
Product | Goods | North America
Schedule of Revenue by Segment [Line Items]
Total revenue									563,694	796,393	993,326
Product | Goods | International
Schedule of Revenue by Segment [Line Items]
Total revenue									528,864	634,866	584,099
Service
Schedule of Revenue by Segment [Line Items]
Total revenue									1,126,357	1,205,487	1,266,452
Service | North America
Schedule of Revenue by Segment [Line Items]
Total revenue									795,213	843,002	920,842
Service | International
Schedule of Revenue by Segment [Line Items]
Total revenue									331,144	362,485	345,610
Service | Local | North America
Schedule of Revenue by Segment [Line Items]
Total revenue									721,038	752,863	825,579
Service | Local | International
Schedule of Revenue by Segment [Line Items]
Total revenue									287,611	306,700	281,466
Service | Goods | North America
Schedule of Revenue by Segment [Line Items]
Total revenue									16,236	18,283	16,768
Service | Goods | International
Schedule of Revenue by Segment [Line Items]
Total revenue									9,441	14,602	20,358
Service | Travel | North America
Schedule of Revenue by Segment [Line Items]
Total revenue									57,939	71,856	78,495
Service | Travel | International
Schedule of Revenue by Segment [Line Items]
Total revenue									$ 34,092	$ 41,183	$ 43,786