Condensed Financial Information of Nesco Holdings, Inc. - Condensed Parent Company Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Assets	$ 815,284	$ 691,556
Deferred tax liabilities	12,288	11,191
Total long-term liabilities	749,651	796,903
Commitments and contingencies (see Note 9)
Common stock - $0.0001 par value, 250,000,000 shares authorized, 49,033,903 and 21,660,638 shares issued and outstanding, at December 31, 2019 and December 31, 2018, respectively	5	2
Additional paid-in capital	432,577	259,298
Accumulated deficit	(444,712)	(417,660)
Accumulated other comprehensive loss	0	(396)
Total stockholders’ deficit	(12,130)	(158,756)	$ (143,964)	$ (117,970)
Total Liabilities and Stockholders’ Deficit	815,284	691,556
Parent Company
Condensed Financial Statements, Captions [Line Items]
Assets	0	0
Deferred tax liabilities	5,205	11,191
Negative investment in subsidiaries	12,111	152,553
Total long-term liabilities	17,316	163,744
Commitments and contingencies (see Note 9)
Common stock - $0.0001 par value, 250,000,000 shares authorized, 49,033,903 and 21,660,638 shares issued and outstanding, at December 31, 2019 and December 31, 2018, respectively	5	2
Additional paid-in capital	427,391	254,310
Accumulated deficit	(444,712)	(417,660)
Accumulated other comprehensive loss	0	(396)
Total stockholders’ deficit	(17,316)	(163,744)
Total Liabilities and Stockholders’ Deficit	$ 0	$ 0