RESTRUCTURING AND OTHER RELATED CHARGES - Schedule of Restructuring Charges by Segment (Details) - USD ($) $ in Thousands	1 Months Ended	7 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	May 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net		$ 0	$ 2,651	$ 5,513	$ 0
Disposal gain	$ 0
Furmanite Netherlands and Belgium Exit
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net			(1,229)	5,513
Disposal gain			1,100
Furmanite Netherlands and Belgium Exit | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net			(173)	4,846
Furmanite Netherlands and Belgium Exit | Employee Severance | TeamFurmanite
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net			(173)	4,862
Furmanite Netherlands and Belgium Exit | Disposal (gain) loss & impairment | TeamFurmanite
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net			(1,056)	651
2017 Cost Savings Initiative
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net			3,880	0
2017 Cost Savings Initiative | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net			3,880
2017 Cost Savings Initiative | Employee Severance | TeamQualspec
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net			966	0
2017 Cost Savings Initiative | Employee Severance | TeamFurmanite
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net			1,622	0
2017 Cost Savings Initiative | Employee Severance | Quest Integrity
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net			428	0
2017 Cost Savings Initiative | Employee Severance | Corporate and shared support services
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net			$ 864	$ 0