ACQUISITIONS - Summary of Purchase Price Allocation (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Feb. 29, 2016	Dec. 31, 2015	Jul. 07, 2015
Business Acquisition [Line Items]
Goodwill	$ 284,804	$ 355,786		$ 256,654
Furmanite
Business Acquisition [Line Items]
Cash and cash equivalents			$ 37,734
Accounts receivable			65,925
Inventory			25,847
Current deferred tax assets			19,857
Prepaid expenses and other current assets			23,044
Current assets of discontinued operations			18,623
Property, plant and equipment			63,259
Intangible assets			88,958
Goodwill			89,646
Other non-current assets			687
Non-current deferred tax assets			2,542
Total assets acquired			436,122
Accounts payable			12,359
Other accrued liabilities			33,127
Income taxes payable			229
Current liabilities of discontinued operations			1,434
Non-current deferred tax liabilities			91,431
Defined benefit pension liability			13,509
Other long-term liabilities			1,692
Total liabilities assumed			153,781
Net assets acquired			$ 282,341
Qualspec Group
Business Acquisition [Line Items]
Cash and cash equivalents					$ 3,981
Accounts receivable					21,495
Current deferred tax assets					279
Prepaid expenses and other current assets					1,049
Property, plant and equipment					15,472
Intangible assets					78,100
Goodwill					148,482
Other non-current assets					138
Total assets acquired					268,996
Accounts payable					2,892
Other accrued liabilities					7,581
Non-current deferred tax liabilities					2,982
Total liabilities assumed					13,455
Net assets acquired					$ 255,541