Income per Share - Basis of Income Per Share Computation (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012
Earnings Per Common Share [Line Items]
Income from continuing operations	$ 29,492	$ 39,705	$ 51,737	$ 59,444
Income from discontinued operations, net of tax		2,685		7,221
Net income	$ 29,492	$ 42,390	$ 51,737	$ 66,665
Weighted average shares outstanding, basic	43,928	45,526	44,173	45,720
Effect of dilutive common stock equivalents	862	779	934	903
Weighted average shares outstanding, diluted	44,790	46,305	45,107	46,623