Reconciliation of Average Number of Common Shares and Common Share Equivalents Outstanding (Detail)	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Average number of common shares outstanding	44,713,000	45,708,000	45,018,000	46,156,000
Incremental shares from assumed exercises of stock options	224,000	148,000	204,000	167,000
Average number of common shares and common share equivalents outstanding	44,937,000	45,856,000	45,222,000	46,323,000