Basis for Income (Loss) Per Share Computation (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Sep. 30, 2012	Oct. 02, 2011
Income (loss) from continuing operations	$ (51,134)	$ 31,365	$ 15,531	$ 88,264
Gain from disposal of discontinued operations, net of tax	9,783		9,783
Income (loss) from discontinued operations, net of tax	2,574	(162)	2,574	(446)
Net income (loss)	$ (38,777)	$ 31,203	$ 27,888	$ 87,818
Weighted average shares outstanding, basic	44,787	47,344	45,410	47,317
Effect of dilutive common stock equivalents		900	839	1,012
Weighted average shares outstanding, diluted	44,787	48,244	46,249	48,329