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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting Information [Line Items]        
Intangible asset amortization expense $ 3.3 $ 1.8 $ 6.3 $ 3.5
Customer contracts and relationships        
Segment Reporting Information [Line Items]        
Weighted-average amortization period of intangible assets     9 years  
Operating contracts and licenses        
Segment Reporting Information [Line Items]        
Weighted-average amortization period of intangible assets     26 years 8 months 12 days  
Tradenames        
Segment Reporting Information [Line Items]        
Weighted-average amortization period of intangible assets     7 years 2 months 12 days  
Non-compete agreements        
Segment Reporting Information [Line Items]        
Weighted-average amortization period of intangible assets     2 years 7 months 6 days  
Other        
Segment Reporting Information [Line Items]        
Weighted-average amortization period of intangible assets     3 years