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Net Income Per Share - Additional Information (Detail) (Employee Stock Option, USD $)	3 Months Ended	6 Months Ended
	Jun. 29, 2012	Jun. 29, 2012
Employee Stock Option
Schedule Of Net Income Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	19,505	25,000
Antidilutive Shares Weighted Average Exercise Price	$ 48.27	$ 48.27

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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