Discontinued Operations (Narrative) (Detail)	3 Months Ended			9 Months Ended			1 Months Ended	3 Months Ended		1 Months Ended
	Sep. 29, 2012 USD ($)	Oct. 01, 2011 USD ($)	Aug. 03, 2011	Sep. 29, 2012 USD ($)	Oct. 01, 2011 USD ($)	Dec. 31, 2011 USD ($)	Mar. 18, 2011 Navis, LLC [Member] USD ($)	Mar. 31, 2012 Navis, LLC [Member] USD ($)	Sep. 29, 2012 Navis, LLC [Member] USD ($)	Aug. 03, 2011 Proveo Ag [Member] USD ($)	Jun. 30, 2012 Proveo Ag [Member] EUR (€)	Aug. 03, 2011 Proveo Ag [Member] EUR (€)
Proceeds from the sale of business				$ 27,580,000	$ 161,206,000		$ 188,588,000
Receivable from previously escrowed funds								13,790,000
Short term receivable from buyer	0			0		27,580,000			13,790,000
Gain (loss) recorded upon divestiture	0	(1,248,000)		613,000	66,753,000					1,248,000
Loan agreed to provide to the buyer											526,058	1,000,000
Loan, duration (date)			Aug. 03, 2012	Dec. 31, 2012
Loan, interest rate											6.50%	6.50%
Tax benefits realized	$ 0	$ (13,308,000)		$ 0	$ 11,773,000					$ 13,308,000