Property, Plant and Equipment - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	$ 14.3		$ 15.3	$ 28.9	$ 30.8
Gain on sale of distribution facility		1.2
Depreciation expense reduction due to change in useful lives	$ 0.5			$ 0.9
Common Stock [Member]
Property, Plant and Equipment [Line Items]
Earnings per share basic for depreciation expense reduction from change in useful lives	$ 0.03			$ 0.06
Earnings per share diluted for depreciation expense reduction from change in useful lives	$ 0.03			$ 0.06
Class B Common Stock [Member]
Property, Plant and Equipment [Line Items]
Earnings per share basic for depreciation expense reduction from change in useful lives	$ 0.03			$ 0.06
Earnings per share diluted for depreciation expense reduction from change in useful lives	$ 0.03			$ 0.06