EMPLOYEE BENEFIT PLANS - Changes in Benefit Obligation and Plan Assets (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Projected benefit obligation:
Beginning of year	$ 0
Acquisition of Furmanite	80,410
Service cost	79
Interest cost	2,504
Actuarial loss	18,233
Benefits paid	2,804
Foreign currency translation adjustment and other	(9,216)
End of year	89,206
Fair value of plan assets:
Beginning of year	0
Acquisition of Furmanite	66,901
Actual gain on plan assets	10,222
Employer contributions	1,182
Benefits paid	(2,804)
Foreign currency translation adjustment and other	(7,534)
End of year	67,967
Excess projected obligation under (over) fair value of plan assets at end of year	21,239
Amounts recognized in accumulated other comprehensive loss:
Net actuarial loss	$ 10,518