Restructuring - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jul. 01, 2012	Jul. 01, 2012 Employee
Effects on Future Earnings and Cash Flows Resulting from Exit Plan [Line Items]
Reduction in number of employees		160
Percent of workforce related to restructuring		7.00%
Total charges expected to be incurred		$ 6.4
Employee termination costs		5.9
Other transitional cost		0.5
Total restructuring charges incurred to date	$ 5.9

The charge against earnings in the period, comprised of costs associated with restructuring activities not otherwise specified in the taxonomy pursuant to a duly authorized plan, excluding a discontinued operation as defined by generally accepted accounting principles. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, but excludes costs associated with the retirement of a long-lived asset and severance costs associated with established compensation plans.

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Amount of costs incurred to date for the specified type of restructuring cost.

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- Definition

Amount expected to be charged against earnings in the current and future periods for the specified restructuring cost.

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- Definition

The charge against earnings in the period for known and estimated costs of termination benefits provided to current employees that are involuntarily terminated under a benefit arrangement associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination or a discontinued operation as defined by generally accepted accounting principles and costs associated with one-time termination benefits.

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