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Other Financial Statement Information - Additional Information (Detail) - USD ($)			3 Months Ended		6 Months Ended
	Jun. 01, 2018	Nov. 02, 2016	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Inventory Disclosure [Abstract]
Cost of inventories for certain materials using LIFO method			$ 29,200,000		$ 29,200,000		$ 29,500,000
Expense (benefit) charge to earnings from LIFO inventory changes			$ 0	$ 200,000	$ 300,000	$ 400,000
Name of plaintiff					Altalink, L.P.
Complaint filling date					November 2016
Estimated damages from defendants	$ 29,400,000	$ 56,000,000

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The difference between the change in the inventory reserve representing the cumulative difference in cost between the first in, first out and the last in, first out inventory valuation methods and any LIFO decrement which have been reflected in the statement of income during the period.

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The amount of LIFO (last in first out) inventory present at the reporting date when inventory is also valued using different valuation methods.

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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States the date the complaint was formally filed in a court of law, in arbitration or mediation.

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