Reconciliation of Average Number of Common Shares and Common Share Equivalents Outstanding (Detail) - shares	3 Months Ended
	Mar. 26, 2016	Mar. 28, 2015
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Average number of common shares outstanding	42,395,000	44,588,000
Incremental shares from assumed exercises of stock options	94,000	172,000
Average number of common shares and common share equivalents outstanding	42,489,000	44,760,000