COMMITMENTS AND CONTINGENCIES (Detail)	12 Months Ended
	Dec. 31, 2018 USD ($) defendant lawsuit	Dec. 31, 2014 defendant patent	Jul. 31, 2007 death
Commitments and Contingencies Disclosure [Line Items]
Number of defendants with cases settled	2
Con Ed Matter
Commitments and Contingencies Disclosure [Line Items]
Number of deaths | death			1
Number of lawsuits | lawsuit	83
Insurance coverage subject to deductible limit | $	$ 250,000
Delaware Cases
Commitments and Contingencies Disclosure [Line Items]
Number of defendants		2
Washington Case
Commitments and Contingencies Disclosure [Line Items]
Number of defendants		1
Subsidiaries
Commitments and Contingencies Disclosure [Line Items]
Number of defendants		3
Quest Integrity
Commitments and Contingencies Disclosure [Line Items]
Number of lawsuits | patent		3
Con Ed Matter
Commitments and Contingencies Disclosure [Line Items]
Liability accrual in excess of the deductible limit for the lawsuits | $	$ 0