Segments - Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Rental revenue	$ 357,305	$ 69,260	$ 810,715	$ 219,484
Depreciation of rental equipment	50,153	19,467	111,176	59,275
Cost of revenue	292,053	53,629	678,554	166,108
Gross Profit	65,252	15,631	132,161	53,376
Equipment Rental Solutions
Segment Reporting Information [Line Items]
Rental revenue	132,225	48,125	315,076	152,278
Depreciation of rental equipment	49,125	18,530	108,202	56,065
Cost of revenue	93,293	36,462	236,700	111,435
Gross Profit	38,932	11,663	78,376	40,843
Truck Equipment Sales
Segment Reporting Information [Line Items]
Rental revenue	190,062	6,048	412,684	19,043
Depreciation of rental equipment	0	0	0	0
Cost of revenue	172,445	5,410	374,180	16,841
Gross Profit	17,617	638	38,504	2,202
Aftermarket Parts and Services
Segment Reporting Information [Line Items]
Rental revenue	35,018	15,087	82,955	48,163
Depreciation of rental equipment	1,028	937	2,974	3,210
Cost of revenue	26,315	11,757	67,674	37,832
Gross Profit	8,703	3,330	15,281	10,331
Rental Revenue
Segment Reporting Information [Line Items]
Rental revenue	109,108	46,125	255,936	144,103
Cost of rental revenue	25,932	13,307	71,873	42,699
Rental Revenue | Equipment Rental Solutions
Segment Reporting Information [Line Items]
Rental revenue	105,124	42,615	244,935	132,693
Rental Revenue | Truck Equipment Sales
Segment Reporting Information [Line Items]
Rental revenue	0	0	0	0
Rental Revenue | Aftermarket Parts and Services
Segment Reporting Information [Line Items]
Rental revenue	3,984	3,510	11,001	11,410
Equipment sales
Segment Reporting Information [Line Items]
Rental revenue	217,163	11,558	482,825	38,628
Cost of rental revenue	191,991	10,600	434,995	33,295
Equipment sales | Equipment Rental Solutions
Segment Reporting Information [Line Items]
Rental revenue	27,101	5,510	70,141	19,585
Cost of rental revenue	19,546	5,190	60,815	16,454
Equipment sales | Truck Equipment Sales
Segment Reporting Information [Line Items]
Rental revenue	190,062	6,048	412,684	19,043
Cost of rental revenue	172,445	5,410	374,180	16,841
Equipment sales | Aftermarket Parts and Services
Segment Reporting Information [Line Items]
Rental revenue	0	0	0	0
Cost of rental revenue	0	0	0	0
Parts and services
Segment Reporting Information [Line Items]
Rental revenue	31,034	11,577	71,954	36,753
Cost of rental revenue	23,977	10,255	60,510	30,839
Parts and services | Equipment Rental Solutions
Segment Reporting Information [Line Items]
Rental revenue	0	0	0	0
Parts and services | Truck Equipment Sales
Segment Reporting Information [Line Items]
Rental revenue	0	0	0	0
Parts and services | Aftermarket Parts and Services
Segment Reporting Information [Line Items]
Rental revenue	31,034	11,577	71,954	36,753
Rentals/parts and services
Segment Reporting Information [Line Items]
Cost of rental revenue	49,909	23,562	132,383	73,538
Rentals/parts and services | Equipment Rental Solutions
Segment Reporting Information [Line Items]
Cost of rental revenue	24,622	12,742	67,683	38,916
Rentals/parts and services | Truck Equipment Sales
Segment Reporting Information [Line Items]
Cost of rental revenue	0	0	0	0
Rentals/parts and services | Aftermarket Parts and Services
Segment Reporting Information [Line Items]
Cost of rental revenue	$ 25,287	$ 10,820	$ 64,700	$ 34,622