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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jan. 01, 2021
Dec. 31, 2020
Revenue from External Customer [Line Items]        
Finance leases $ 11,791,000   $ 10,500,000  
Impairment of goodwill 0 $ 0    
Allowance for accounts receivable 12,400,000     $ 6,400,000
Implementation costs capitalized $ 2,000,000.0      
Minimum        
Revenue from External Customer [Line Items]        
Useful life 4 years      
Amortization period 3 years      
Minimum | Rental equipment        
Revenue from External Customer [Line Items]        
Useful life 5 years      
Estimated residual value 15.00%      
Maximum        
Revenue from External Customer [Line Items]        
Useful life 39 years 6 months      
Amortization period 10 years      
Maximum | Rental equipment        
Revenue from External Customer [Line Items]        
Useful life 7 years      
Estimated residual value 35.00%