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Retirement Plan (Details)
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Retirement Plan (Details) [Line Items]    
Deferral rate, percentage 3.00% 3.00%
Retirement plan, description The Company provides for safe harbor matching contributions equal to 100% on the first 3% of an employee’s eligible earnings deferred and an additional 50% on the next 2% of an employee’s eligible earnings deferred. Employee elective deferrals and safe harbor matching contributions are 100% vested at all times. The Company provides for safe harbor matching contributions equal to 100% on the first 3% of an employee’s eligible earnings deferred and an additional 50% on the next 2% of an employee’s eligible earnings deferred. Employee elective deferrals and safe harbor matching contributions are 100% vested at all times.
Retirement plan participants require age 21 years 21 years
Retirement plan contribution description In connection with the acquisition of World Energy, XL Fleet adopted the World Energy 401(k) plan whose features are the same as those of the XL Fleet 401(k) plan except that (i) Participants are allowed to contribute, subject to IRS limitations on total annual contributions from 1% to 100% of eligible earnings and (ii) the safe harbor non-elective contribution is equal to 3% of employee’s compensation.  
Minimum [Member]    
Retirement Plan (Details) [Line Items]    
Annual contributions, percentage 1.00% 1.00%
Maximum [Member]    
Retirement Plan (Details) [Line Items]    
Annual contributions, percentage 90.00% 90.00%