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Number of customers accounted for more than ten percentage of revenue.

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Number Of Locations From Which Entity Operates

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Significant Accounting Policies [Line Items]

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Tax Cuts and Jobs Act of 2018, Adjustments to Incomplete Accounting Provisional Income Tax Expense (Benefit)

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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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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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

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The number of countries in which the entity operates as of balance sheet date.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES - Additional Information (Details) $ in Thousands		3 Months Ended		12 Months Ended
	Dec. 01, 2017 USD ($)	Mar. 31, 2018 USD ($) employee country segment Location customer	Mar. 31, 2017	Dec. 31, 2017 USD ($)
Accounting Policies [Abstract]
Number of operating segments \| segment		3
Number of locations in which company operates (more than) \| Location		220
Number of countries in which the company operates \| country		20
Number of employees (more than) \| employee		7,300
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill impairment loss	$ 0
Goodwill		$ 285,096		$ 284,804
Accumulated impairment loss		$ 75,200		$ 75,200
Income Tax Disclosure [Abstract]
Federal corporate tax rate		21.00%		35.00%
Adjustments to December 31, 2017 provisional estimates		$ 0
Effective tax rate		(3.60%)	39.00%
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		$ 193,936		$ 194,211
Accumulated impairment loss		21,100		21,100
MS
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill		56,950		56,600
Accumulated impairment loss		$ 54,100		$ 54,100