Condensed Financial Information of Nesco Holdings, Inc. - Condensed Parent Company Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended								5 Months Ended	7 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Jul. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Selling, general, and administrative expenses											$ 34,667	$ 32,718	$ 27,555
Total operating expenses											50,530	38,454	34,257
Operating Income	$ 11,919	$ 5,589	$ 9,820	$ 8,690	$ 12,096	$ 10,940	$ 9,201	$ 10,927			36,018	43,164	23,488
Other expense, net											1,690	287	366
Total other expenses											69,056	56,985	54,076
Loss Before Income Taxes											(33,038)	(13,821)	(30,588)
Income Tax Expense (Benefit)											(5,986)	1,705	(3,493)
Net Loss	$ 3,105	$ (18,010)	$ (5,423)	$ (6,724)	$ (3,406)	$ (3,677)	$ (5,409)	$ (3,034)	$ (16,064)	$ (10,988)	(27,052)	(15,526)	(27,095)
Parent Company
Condensed Financial Statements, Captions [Line Items]
Selling, general, and administrative expenses											816	0	0
Total operating expenses											816	0	0
Operating Income											(816)	0	0
Equity in net loss of subsidiaries											32,222	13,821	30,588
Other expense, net											0	0	0
Total other expenses											32,222	13,821	30,588
Loss Before Income Taxes											(33,038)	(13,821)	(30,588)
Income Tax Expense (Benefit)											(5,986)	1,705	(3,493)
Net Loss											$ (27,052)	$ (15,526)	$ (27,095)