RESTRUCTURING AND OTHER RELATED CHARGES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Restructuring Cost and Reserve [Line Items]
Charges	$ 2,637	$ 0	$ 1,661	$ 0
Furmanite Netherlands and Belgium Exit
Restructuring Cost and Reserve [Line Items]
Gain on disposal			1,100
Charges	5		(1,208)
Other assets transferred			200
2017 Cost Savings Initiative
Restructuring Cost and Reserve [Line Items]
Charges	2,632		2,869
Other Restructuring | Furmanite Netherlands and Belgium Exit
Restructuring Cost and Reserve [Line Items]
Cash paid to purchaser of business			300
Employee Severance | Furmanite Netherlands and Belgium Exit
Restructuring Cost and Reserve [Line Items]
Severance costs (credits)			(152)
Charges			200
Severance liabilities transferred to purchaser			1,601
Exit activities, costs incurred to date	4,700		4,700
Employee Severance | 2017 Cost Savings Initiative
Restructuring Cost and Reserve [Line Items]
Charges			2,869
Exit activities, costs incurred to date	2,900		2,900
Impairment Loss On Property, Plant And Equipment | Furmanite Netherlands and Belgium Exit
Restructuring Cost and Reserve [Line Items]
Exit activities, costs incurred to date	700		700
TeamFurmanite | Furmanite Netherlands and Belgium Exit
Restructuring Cost and Reserve [Line Items]
Gain on disposal	0		(1,056)
TeamFurmanite | Employee Severance | Furmanite Netherlands and Belgium Exit
Restructuring Cost and Reserve [Line Items]
Charges	5		(152)
TeamFurmanite | Employee Severance | 2017 Cost Savings Initiative
Restructuring Cost and Reserve [Line Items]
Charges	1,219		1,219
Quest Integrity | Employee Severance | 2017 Cost Savings Initiative
Restructuring Cost and Reserve [Line Items]
Charges	424		424
TeamQualspec | Employee Severance | 2017 Cost Savings Initiative
Restructuring Cost and Reserve [Line Items]
Charges	862		862
Corporate and shared support services | Employee Severance | 2017 Cost Savings Initiative
Restructuring Cost and Reserve [Line Items]
Charges	127		364
Maximum | Furmanite Netherlands and Belgium Exit
Restructuring Cost and Reserve [Line Items]
Exit activities, estimated costs remaining	$ 1,000		$ 1,000