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Segment Reporting - Additional Information (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Site
Segment
Jun. 30, 2020
USD ($)
Apr. 14, 2020
Site
Dec. 31, 2020
USD ($)
Segment Reporting [Abstract]            
Number of reportable segments | Segment     2      
Number of converted operated sites to dealer operated sites | Site     0   46  
Contract costs, unamortized balance $ 9.8   $ 9.8     $ 8.3
Contract costs, amortization against operating revenues $ 0.4 $ 0.3 $ 0.7 $ 0.5