CONCENTRATIONS - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Concentration Risk [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%
United Kingdom
Concentration Risk [Line Items]
Concentration risk, percentage	20.00%	25.00%	34.00%
Supplier Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	10.00%	10.00%
Sales Revenue
Concentration Risk [Line Items]
Concentration risk, percentage	19.00%	31.00%	46.00%
Sales Revenue | DigiKey Electronics in Power and Electro Mechanical Segment
Concentration Risk [Line Items]
Concentration risk, percentage		20.00%	30.00%
Sales Revenue | National Grid in the Energy Segment
Concentration Risk [Line Items]
Concentration risk, percentage		11.00%	16.00%
Sales Revenue | United Kingdom
Concentration Risk [Line Items]
Concentration risk, percentage	20.00%	25.00%	34.00%
Sales Revenue | Two Customers
Concentration Risk [Line Items]
Concentration risk, percentage	10.00%	10.00%	10.00%
Sales Revenue | Supplier Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage			11.00%
Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, percentage	30.00%	11.00%
Gross trade accounts receivable from continuing operations	$ 9.5	$ 14.8
Accounts Receivable | United Kingdom
Concentration Risk [Line Items]
Concentration risk, percentage	27.00%	28.00%	54.00%
Accounts Receivable | Customer Three
Concentration Risk [Line Items]
Concentration risk, percentage	10.00%