Subsequent Events - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2018	Nov. 30, 2017
Subsequent Event [Line Items]
Proceeds from sale of assets		$ 170	$ 16,312	$ 20,447	$ 16,739
Subsequent Event | Lincoln Electric Holdings, Inc. | Brazing Assets Purchase Agreement
Subsequent Event [Line Items]
Proceeds from sale of assets	$ 1,900
Subsequent Event | Lincoln Electric Holdings, Inc. | Pressure Cylinders
Subsequent Event [Line Items]
Proceeds from sale of assets	$ 26,500