RESTRUCTURING AND OTHER RELATED CHARGES (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net	$ 208	$ 0
OneTeam Program
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net	208	0
OneTeam Program | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net	208
Exit activities, costs incurred to date	6,900
OneTeam Program | Employee Severance | IHT
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net	102	0
OneTeam Program | Employee Severance | MS
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net	85	0
OneTeam Program | Employee Severance | Quest Integrity
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net	0	0
OneTeam Program | Employee Severance | Corporate and shared support services
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net	$ 21	$ 0