Goodwill and Other Intangible Assets - Goodwill Roll-forward (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Line Items]
Balance, beginning of year	$ 948,643,000	$ 917,419,000
Merger and other acquisitions	33,434,000	27,306,000
Effect of foreign currency translation	(6,505,000)	5,175,000
Other adjustments	1,809,000	(1,257,000)
Balance, end of year	977,381,000	948,643,000
Goodwill impairment	0	0
United States
Goodwill [Line Items]
Balance, beginning of year	771,311,000	759,538,000
Merger and other acquisitions	28,978,000	11,773,000
Effect of foreign currency translation	0	0
Other adjustments	1,859,000	0
Balance, end of year	802,148,000	771,311,000
Latin America Operations
Goodwill [Line Items]
Balance, beginning of year	177,332,000	157,881,000
Merger and other acquisitions	4,456,000	15,533,000
Effect of foreign currency translation	(6,505,000)	5,175,000
Other adjustments	(50,000)	(1,257,000)
Balance, end of year	$ 175,233,000	$ 177,332,000