Segments - Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Rental revenue	$ 78,299	$ 81,743
Cost of revenue	40,236	40,228
Depreciation of rental equipment	17,844	20,112
Gross Profit	20,219	21,403
ERS
Segment Reporting Information [Line Items]
Rental revenue	62,717	63,723
Cost of revenue	29,202	27,320
Depreciation of rental equipment	16,885	18,976
Gross Profit	16,630	17,427
PTA
Segment Reporting Information [Line Items]
Rental revenue	15,582	18,020
Cost of revenue	11,034	12,908
Depreciation of rental equipment	959	1,136
Gross Profit	3,589	3,976
Revenue
Segment Reporting Information [Line Items]
Rental revenue	48,289	50,994
Cost of revenue	16,643	13,786
Revenue \| ERS
Segment Reporting Information [Line Items]
Rental revenue	44,730	47,053
Revenue \| PTA
Segment Reporting Information [Line Items]
Rental revenue	3,559	3,941
Sales of rental equipment
Segment Reporting Information [Line Items]
Rental revenue	10,485	9,093
Cost of revenue	6,740	7,728
Sales of rental equipment \| ERS
Segment Reporting Information [Line Items]
Rental revenue	10,485	9,093
Sales of rental equipment \| PTA
Segment Reporting Information [Line Items]
Rental revenue	0	0
Sales of new equipment
Segment Reporting Information [Line Items]
Rental revenue	7,502	7,577
Cost of revenue	6,925	6,654
Sales of new equipment \| ERS
Segment Reporting Information [Line Items]
Rental revenue	7,502	7,577
Sales of new equipment \| PTA
Segment Reporting Information [Line Items]
Rental revenue	0	0
Parts sales and services
Segment Reporting Information [Line Items]
Rental revenue	12,023	14,079
Cost of revenue	9,643	11,360
Parts sales and services \| ERS
Segment Reporting Information [Line Items]
Rental revenue	0	0
Parts sales and services \| PTA
Segment Reporting Information [Line Items]
Rental revenue	$ 12,023	$ 14,079

Cost of product sold and service rendered, excluding depreciation, depletion, and amortization.

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