Reconciliation of Average Number of Common Shares Outstanding to Average Number of Diluted Shares Outstanding (Detail)	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Earnings Per Share Disclosure [Line Items]
Average number of common shares outstanding	45,708,000	46,614,000	46,156,000	46,775,000
Incremental shares from assumed exercises of stock options	148,000	118,000	167,000	189,000
Average number of common shares and common share equivalents outstanding	45,856,000	46,732,000	46,323,000	46,964,000