Goodwill and Intangible Assets - Schedule of Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 237,658	$ 238,195
Nesco trade name	28,000	28,000
Intangible assets, gross	82,290	82,290
Less: accumulated amortization	(13,971)	(11,738)
Intangible assets, net	68,319	70,552
Goodwill and intangible assets	305,977	308,747
ERS
Finite-Lived Intangible Assets [Line Items]
Goodwill	228,900	228,900
PTA
Finite-Lived Intangible Assets [Line Items]
Goodwill	8,800	8,800
Trade names
Finite-Lived Intangible Assets [Line Items]
Other intangible assets	1,030	1,030
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Other intangible assets	380	380
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Other intangible assets	$ 52,880	$ 52,880