SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES - Schedule of Rollforward Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($)
Goodwill [Roll Forward]
Balance at beginning of period	$ 256,654
Acquisitions	103,995
Foreign currency adjustments	1,312
Balance at end of period	361,961
Team Qualspec
Goodwill [Roll Forward]
Balance at beginning of period	207,497
Acquisitions	5,955
Foreign currency adjustments	917
Balance at end of period	214,369
Team Furmanite
Goodwill [Roll Forward]
Balance at beginning of period	19,874
Acquisitions	93,903
Foreign currency adjustments	159
Balance at end of period	113,936
Quest Integrity
Goodwill [Roll Forward]
Balance at beginning of period	29,283
Acquisitions	4,137
Foreign currency adjustments	236
Balance at end of period	$ 33,656