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Other Financial Statement Information - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Nov. 02, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Inventory Disclosure [Abstract]
Cost of inventories for certain materials using LIFO method		$ 27.0		$ 27.0		$ 28.6
(Benefit) charge to earnings from LIFO inventory changes		$ (0.1)	$ (0.5)	$ 0.1	$ (0.1)
Name of plaintiff				Altalink, L.P.
Complaint filling date				November 2016
Estimated damages from defendants	$ 56.0

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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.

+ References

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-Publisher FASB
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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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