Segment and Geographic Information - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Segment Reporting Information
Net income	$ 193,931	$ 152,593	$ 458,680	$ 403,761
Less: net income (loss) attributable to continuing noncontrolling interest	448	(46)	1,166	2,321
Less: net income attributable to discontinued noncontrolling interest	0	376	103	568
(Gain on disposal of business) and impairment of net assets held for sale		4,000		45,000
Segment EBITDA	389,462	336,486	1,002,568	1,015,075
Depreciation and amortization	76,327	77,878	$ 220,636	230,239
Number of operating segments			4
Number of reportable segments			3
North America [Member]
Segment Reporting Information
Segment EBITDA	204,957	166,310	$ 565,949	532,994
Depreciation and amortization	24,479	23,593	$ 72,677	68,257
Number of reportable segments			1
Europe [Member]
Segment Reporting Information
Segment EBITDA	136,165	124,712	$ 303,814	346,291
Depreciation and amortization	44,412	47,302	126,000	141,087
Specialty [Member]
Segment Reporting Information
Segment EBITDA	48,340	45,464	132,805	135,790
Depreciation and amortization	7,436	6,983	21,959	20,895
Intersegment Eliminations [Member]
Segment Reporting Information
Segment EBITDA	0	0	0	0
Depreciation and amortization	$ 0	$ 0	$ 0	$ 0