Other Financial Statement Information - Additional Information (Detail) - USD ($) $ in Millions			12 Months Ended
	Jun. 01, 2018	Nov. 02, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Cost of inventories for certain materials using LIFO method			$ 29.5	$ 25.1
Depreciation of property and equipment			12.1	11.8	$ 10.8
Capital leases of machinery, equipment and aircraft			$ 0.1	$ 0.2
Name of plaintiff			Altalink, L.P.
Complaint filling date			November 2016
Estimated damages from defendants	$ 29.4	$ 56.0