Income Per Share - Basis of Income Per Share Computation (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jul. 01, 2012	Apr. 01, 2012	Dec. 31, 2011	Oct. 02, 2011	Jul. 03, 2011	Apr. 03, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Earnings Per Common Share [Line Items]
Income from continuing operations	$ 39,478	$ (55,686)	$ 39,705	$ 19,739	$ 22,773	$ 28,156	$ 31,771	$ 18,608	$ 43,236	$ 101,308	$ 61,276
Income from discontinued operations, net of tax	2,428	7,125	2,685	4,536	3,754	3,047	2,954	3,282	16,774	13,037	2,336
Gain from disposal of discontinued operations, net of tax	124,697	9,783							134,480		44,847
Net income	$ 166,603	$ (38,778)	$ 42,390	$ 24,275	$ 26,527	$ 31,203	$ 34,725	$ 21,890	$ 194,490	$ 114,345	$ 108,459
Denominator for basic income per share-weighted average shares									45,097	47,109	46,805
Effect of dilutive common stock equivalents									845	995	978
Denominator for diluted income per share-adjusted weighted average shares									45,942	48,104	47,783