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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES - Additional Information (Details) $ in Thousands		3 Months Ended	6 Months Ended		12 Months Ended
	Dec. 01, 2017 USD ($)	Jun. 30, 2018 USD ($) employee country Location	Jun. 30, 2018 USD ($) employee country segment customer Location	Jun. 30, 2017	Dec. 31, 2017 USD ($)
Accounting Policies [Abstract]
Number of operating segments \| segment			3
Number of locations in which company operates (more than) \| Location		200	200
Number of countries in which the company operates \| country		20	20
Number of employees (more than) \| employee		7,300	7,300
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill impairment loss	$ 0
Goodwill		$ 283,090	$ 283,090		$ 284,804
Accumulated impairment loss		75,200	$ 75,200		$ 75,200
Income Tax Disclosure [Abstract]
Federal corporate tax rate			21.00%		35.00%
Adjustments to December 31, 2017 provisional estimates		0	$ 0
Effective tax rate			4.50%	22.80%
Sales Revenue, Net \| Customer Concentration Risk
Significant Accounting Policies [Line Items]
Number of customers accounted for more than specified percentage of consolidated revenues \| customer			0
IHT
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill		193,306	$ 193,306		$ 194,211
Accumulated impairment loss		21,100	21,100		21,100
MS
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill		56,210	56,210		56,600
Accumulated impairment loss		$ 54,100	$ 54,100		$ 54,100