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Other Financial Statement Information - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Inventory Disclosure [Abstract]
Cost of inventories for certain materials using LIFO method	$ 26.5us-gaap_LIFOInventoryAmount		$ 27.0us-gaap_LIFOInventoryAmount
(Benefit) charge to earnings from LIFO inventory changes	$ 0.1us-gaap_InventoryLIFOReserveEffectOnIncomeNet	$ (0.1)us-gaap_InventoryLIFOReserveEffectOnIncomeNet

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- Details

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Namespace Prefix:	us-gaap_
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X

- Definition

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.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766

+ Details

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