Basis of Presentation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jul. 01, 2011	Jun. 30, 2012	Jul. 01, 2011
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Stock split description			On June 1, 2011, the Company effected a two-for-one stock split of the Company’s Common Stock in the form of a 100% stock dividend. All applicable amounts in the consolidated financial statements, including earnings per share and related disclosures, have been retroactively adjusted to reflect the stock split.
Stock split conversion ratio			2
Stock split, rate of stock dividend			100.00%
Research and development expenses	$ 13.9	$ 13.1	$ 26.5	$ 25.6

The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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Description of the stock split arrangement. Also provide the retroactive effect given by a stock split that occurs after the balance date but before the release of financial statements.

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