SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES - Schedule of Rollforward Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Goodwill [Roll Forward]
Balance at beginning of period				$ 355,786
Foreign currency adjustments				4,135
Impairment loss	$ (75,241)	$ 0	$ 0	(75,241)	$ 0	$ 0
Balance at end of period	284,680			284,680		355,786
TeamQualspec
Goodwill [Roll Forward]
Balance at beginning of period				213,475
Foreign currency adjustments				1,890
Impairment loss	(21,100)			(21,140)
Balance at end of period	194,225			194,225		213,475
TeamFurmanite
Goodwill [Roll Forward]
Balance at beginning of period				109,059
Foreign currency adjustments				1,476
Impairment loss	(54,100)			(54,101)
Balance at end of period	56,434			56,434		109,059
Quest Integrity
Goodwill [Roll Forward]
Balance at beginning of period				33,252
Foreign currency adjustments				769
Impairment loss				0
Balance at end of period	$ 34,021			$ 34,021		$ 33,252