Geographic Data - Net Sales by Major Product Category (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Oct. 01, 2011	Jul. 02, 2011	Apr. 02, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenue from External Customer [Line Items]
Total net sales	$ 253,179	$ 252,037	$ 247,077	$ 243,875	$ 247,308	$ 253,338	$ 245,541	$ 237,301	$ 996,168	$ 983,488	$ 894,359
United States [Member]
Revenue from External Customer [Line Items]
Total net sales									539,504	504,283	482,891
United Kingdom [Member]
Revenue from External Customer [Line Items]
Total net sales									317,793	339,027	303,604
Singapore [Member]
Revenue from External Customer [Line Items]
Total net sales									134,349	136,757	105,286
Other [Member]
Revenue from External Customer [Line Items]
Total net sales									$ 4,522	$ 3,421	$ 2,578