SEGMENT INFORMATION - SCHEDULE OF RECONCILIATION OF SEGMENT ASSETS TO TOTAL ASSETS (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Asset Reconciling Item
Segment assets	$ 264,450	$ 74,879
Property and equipment, net	53,292	23,645
Goodwill	770,226	170,990	$ 150,630
Indefinite-lived intangible assets	153,447	4,884
Definite-lived intangible assets, net	175,124	5,908
Assets before deferred tax assets	1,416,539	280,306
Add: Deferred tax assets	50,723	15,211
TOTAL ASSETS	1,467,262	295,517
North America
Segment Reporting, Asset Reconciling Item
Segment assets	253,582	24,630
Property and equipment, net	49,487	21,775
Goodwill	696,291	140,930	140,930
Indefinite-lived intangible assets	140,034	600
Definite-lived intangible assets, net	169,054	2,454
Assets before deferred tax assets	1,308,448	190,389
Europe
Segment Reporting, Asset Reconciling Item
Segment assets	10,868	50,249
Property and equipment, net	3,805	1,870
Goodwill	73,935	30,060	$ 9,700
Indefinite-lived intangible assets	13,413	4,284
Definite-lived intangible assets, net	6,070	3,454
Assets before deferred tax assets	$ 108,091	$ 89,917