Income per Share - Basis for Income per Share Computations (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Earnings Per Share [Abstract]
Income from continuing operations	$ 21,677	$ 15	$ 2,041	$ 25,171
Loss from disposal of discontinued operations, net of tax	(86)		(86)	(562)
Net income	$ 21,591	$ 15	$ 1,955	$ 24,609
Weighted average shares outstanding, basic	42,655	43,603	42,596	43,559
Effect of dilutive common stock equivalents	578	689	628	734
Weighted average shares outstanding, diluted	43,233	44,292	43,224	44,293