SEGMENT INFORMATION - Schedule of Gross Profit 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
Segment Reporting Information [Line Items]
Gross Profit	$ 310,041	$ 277,940	$ 292,132	$ 306,016	$ 366,069	$ 305,989	$ 323,658	$ 324,885	$ 1,186,129	$ 1,320,601	$ 1,333,861
North America
Segment Reporting Information [Line Items]
Gross Profit									807,745	890,684	927,678
International
Segment Reporting Information [Line Items]
Gross Profit									378,384	429,917	406,183
Service | North America
Segment Reporting Information [Line Items]
Gross Profit									702,403	744,599	782,096
Service | International
Segment Reporting Information [Line Items]
Gross Profit									309,492	340,811	323,546
Service | Local | North America
Segment Reporting Information [Line Items]
Gross Profit									643,499	671,352	708,573
Service | Local | International
Segment Reporting Information [Line Items]
Gross Profit									269,666	289,427	265,348
Service | Goods | North America
Segment Reporting Information [Line Items]
Gross Profit									13,165	15,302	12,929
Service | Goods | International
Segment Reporting Information [Line Items]
Gross Profit									31,317	38,132	40,288
Service | Travel | North America
Segment Reporting Information [Line Items]
Gross Profit									45,739	57,945	60,594
Service | Travel | International
Segment Reporting Information [Line Items]
Gross Profit									8,509	13,252	17,910
Product | Goods | North America
Segment Reporting Information [Line Items]
Gross Profit									105,342	146,085	145,582
Product | Goods | International
Segment Reporting Information [Line Items]
Gross Profit									$ 68,892	$ 89,106	$ 82,637