SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES - Schedule of Rollforward Goodwill (Detail) - USD ($) $ in Thousands		3 Months Ended		7 Months Ended	12 Months Ended
	Dec. 01, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	May 31, 2015
Goodwill [Roll Forward]
Balance at beginning of period					$ 355,786	$ 256,654
Acquisitions					0	99,738
Foreign currency adjustments					4,259	(606)
Impairment loss	$ 0	$ (75,200)	$ 0	$ 0	(75,241)	0	$ 0
Balance at end of period				256,654	284,804	355,786
TeamQualspec
Goodwill [Roll Forward]
Balance at beginning of period					213,475	207,497
Acquisitions					0	5,955
Foreign currency adjustments					1,876	23
Impairment loss					(21,140)	0
Balance at end of period				207,497	194,211	213,475
TeamFurmanite
Goodwill [Roll Forward]
Balance at beginning of period					109,059	19,874
Acquisitions					0	89,646
Foreign currency adjustments					1,642	(461)
Impairment loss					(54,101)	0
Balance at end of period				19,874	56,600	109,059
Quest Integrity
Goodwill [Roll Forward]
Balance at beginning of period					33,252	29,283
Acquisitions					0	4,137
Foreign currency adjustments					741	(168)
Impairment loss					0	0
Balance at end of period				$ 29,283	$ 33,993	$ 33,252