Income per Share - Basis for Income per Share Computations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
Earnings Per Share [Abstract]
Income from continuing operations	$ 33,847	$ 29,068	$ 59,018	$ 80,805
Loss from discontinued operations, net of tax			(562)
Net income	$ 33,847	$ 29,068	$ 58,456	$ 80,805
Weighted average shares outstanding, basic	43,201	43,694	43,439	44,013
Effect of dilutive common stock equivalents	709	843	725	903
Weighted average shares outstanding, diluted	43,910	44,537	44,164	44,916