NATURE OF OPERATIONS AND BASIS OF PRESENTATION - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016
Orbital Gas Systems Limited
Business Description and Basis Of Presentation [Line Items]
Capital Stock Acquired Percentage	100.00%
Power And Electro-mechanic Segment [Member]
Business Description and Basis Of Presentation [Line Items]
Percentage of total revenue	68.00%
Energy Segment [Member]
Business Description and Basis Of Presentation [Line Items]
Percentage of total revenue	32.00%