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Goodwill and Other Intangible Assets - Goodwill Roll-forward (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Goodwill [Line Items]    
Balance, beginning of year $ 831,145,000 $ 831,151,000
Merger and other acquisitions 86,968,000 554,000
Effect of foreign currency translation (694,000) 2,061,000
Other adjustments   (2,621,000)
Balance, end of year 917,419,000 831,145,000
Goodwill impairment 0 0
United States    
Goodwill [Line Items]    
Balance, beginning of year 743,997,000 746,204,000
Merger and other acquisitions 15,541,000 414,000
Effect of foreign currency translation 0 0
Other adjustments   (2,621,000)
Balance, end of year 759,538,000 743,997,000
Latin America Operations    
Goodwill [Line Items]    
Balance, beginning of year 87,148,000 84,947,000
Merger and other acquisitions 71,427,000 140,000
Effect of foreign currency translation (694,000) 2,061,000
Other adjustments   0
Balance, end of year $ 157,881,000 $ 87,148,000