GOODWILL AND LONG-LIVED ASSETS - Schedule of Impairment Charges Presented within Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of long-lived assets	$ 7,651	$ 3,296	$ 7,651	$ 39,550
Long-lived asset impairment:
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of long-lived assets	0	0	0	22,351
Long-lived asset impairment: \| North America
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of long-lived assets	0	0	0	0
Long-lived asset impairment: \| International
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of long-lived assets	0	0	0	22,351
Restructuring and related charges:
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of long-lived assets	7,651	3,296	7,651	17,199
Restructuring and related charges: \| North America
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of long-lived assets	5,430	834	5,430	14,322
Restructuring and related charges: \| International
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of long-lived assets	$ 2,221	$ 2,462	$ 2,221	$ 2,877