SHARE-BASED COMPENSATION - Stock Options (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	7 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	May 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 3.5	$ 7.9	$ 7.3	$ 4.8
No. of Options
Shares under option, beginning of year (in shares)	490	203	376	816
Granted (in shares)	0	0	0	0
Assumed - Furmanite Acquisition (in shares)		0	132
Exercised (in shares)	(109)	(16)	(251)	(326)
Cancelled (in shares)	0	0	(50)	0
Expired (in shares)	(5)	(108)	(4)	0
Shares under option, end of year (in shares)	376	79	203	490
Exercisable at end of year (in shares)	376	79	203	490
Weighted Average Exercise Price
Shares under option, beginning of year (in USD per share)	$ 24.80	$ 30.63	$ 25.71	$ 19.61
Granted (in USD per share)	0.00	0.00	0.00	0.00
Assumed - Furmanite Acquisition (in USD per share)		0.00	33.20
Exercised (in USD per share)	21.41	27.91	23.50	11.79
Cancelled (in USD per share)	0.00	0.00	35.00	0.00
Expired (in USD per share)	30.33	30.08	44.62	0.00
Shares under option, end of year (in USD per share)	25.71	31.94	30.63	24.80
Exercisable at end of year (in USD per share)	$ 25.71	$ 31.94	$ 30.63	$ 24.80
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 0.0	$ 0.1	$ 0.2	$ 0.0