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Related-Party Transactions - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Related Party Transaction [Line Items]          
Revenue from related parties $ 800,000 $ 500,000 $ 1,400,000 $ 900,000  
Accounts Payable and Accrued and Other Current Liabilities          
Related Party Transaction [Line Items]          
Due to related parties 7,800,000   7,800,000   $ 9,200,000
Prepaid Expenses and Other Current Assets          
Related Party Transaction [Line Items]          
Due from related parties 400,000   400,000   $ 200,000
Marketing Services          
Related Party Transaction [Line Items]          
Related party transactions, purchase 600,000 1,100,000 1,400,000 1,900,000  
Affiliated with Significant Stockholder | Vehicle Rental Partnership Agreement          
Related Party Transaction [Line Items]          
Related party transaction, reimbursement for marketing fees   0   0  
Affiliated with Significant Stockholder | Advertising Related and Other Services          
Related Party Transaction [Line Items]          
Related party transactions, purchase $ 14,700,000 19,900,000 $ 32,800,000 41,700,000  
Affiliated with Significant Stockholder | Payment in Excess of Rental Fees Recorded as Reduction to Revenue | Vehicle Rental Partnership Agreement          
Related Party Transaction [Line Items]          
Amount paid to related party   $ 0   $ 200,000