Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 680,295	$ 238,052
Trade names
Finite-Lived Intangible Assets [Line Items]
Amortization period	12 months
Equipment Rental Solutions
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 481,800	229,500
Truck Equipment Sales
Finite-Lived Intangible Assets [Line Items]
Goodwill	161,600
Aftermarket Parts and Services
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 36,900	$ 8,700