ACQUISITIONS - Summary of Purchase Price Allocation (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Feb. 29, 2016
Business Acquisition [Line Items]
Goodwill	$ 281,650	$ 284,804	$ 355,786
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