Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Sep. 30, 2012	Oct. 02, 2011
Decrease in tax expense upon the expiration of the statutes of limitation for certain reserves for income tax uncertainties			$ 441,000	$ 808,000
Increase (decrease) in tax expense for the final true-up of the prior year's tax accrual upon filing the actual tax returns			84,000	574,000
Effective discrete tax rate	21.00%	23.00%	21.00%	23.00%
Provision for effective tax rate	19.00%	21.00%	20.00%	22.00%
Valuation allowance	2,457,000	2,457,000	2,457,000	2,457,000
Decrease in tax expense for the finalization of advanced pricing agreement				155,000
Increase in liability net of deferred tax benefit for uncertain tax positions	206,000		428,000
Increase (decrease) in interest and penalties	32,000		95,000
Interest and penalties, gross	4,890,000		4,890,000
Reserve for income taxes, total	1,149,000		1,149,000
Reserve for Income Taxes to be Recorded in Additional Paid in Capital			311,000
Release of reserves, lower range	1,500,000		1,500,000
Release of reserves, upper range	$ 1,800,000		$ 1,800,000
Tax years open to examination by various tax authorities			2007 through 2011
Tax years open to examination by various tax authorities for other entities			2006