SEGMENT INFORMATION - Summary (Details) $ in Thousands	3 Months Ended
Mar. 31, 2019 USD ($) segment	Mar. 31, 2018 USD ($)
Segment Reporting [Abstract]
Number of reportable segments \| segment	3
Segment Reporting Information [Line Items]
Revenues	$ 883,039	$ 794,977
Operating income (loss) for segments	199,492	156,170
Depreciation and amortization	148,630	121,743
Corporate
Segment Reporting Information [Line Items]
Operating income (loss) for segments	(55,889)	(63,556)
Depreciation and amortization	2,359	1,841
Acquisition-related costs	5,300	18,300
North America
Segment Reporting Information [Line Items]
Revenues	678,423	594,029
North America \| Operating segments
Segment Reporting Information [Line Items]
Revenues	678,423	594,029
Operating income (loss) for segments	156,146	125,404
Depreciation and amortization	128,237	102,525
Europe
Segment Reporting Information [Line Items]
Revenues	142,869	143,277
Europe \| Operating segments
Segment Reporting Information [Line Items]
Revenues	142,869	143,277
Operating income (loss) for segments	71,961	70,548
Depreciation and amortization	12,994	12,745
Asia-Pacific
Segment Reporting Information [Line Items]
Revenues	61,747	57,671
Asia-Pacific \| Operating segments
Segment Reporting Information [Line Items]
Revenues	61,747	57,671
Operating income (loss) for segments	27,274	23,774
Depreciation and amortization	$ 5,040	$ 4,632

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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