Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended				9 Months Ended		3 Months Ended	9 Months Ended	1 Months Ended	12 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended				3 Months Ended	9 Months Ended
	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Sep. 29, 2013	Sep. 30, 2012	Sep. 30, 2012 Thermax and Raydex [Member]	Sep. 30, 2012 Thermax and Raydex [Member]	Sep. 29, 2013 Trapeze [Member]	Dec. 31, 2010 Trapeze [Member]	Sep. 30, 2012 Communications cable operation in Phoenix, Arizona [Member] Reversal of Uncertain Tax Position Liability [Member]	Sep. 30, 2012 Communications cable operation in Phoenix, Arizona [Member] Reversal of Uncertain Tax Position Liability [Member]	Sep. 30, 2012 Communications cable operation in Phoenix, Arizona [Member] Reversal of Accrued Interest and Penalties [Member]	Sep. 30, 2012 Communications cable operation in Phoenix, Arizona [Member] Reversal of Accrued Interest and Penalties [Member]	Sep. 29, 2013 Standby letters of credit [Member]	Sep. 29, 2013 Bank guaranties [Member]	Sep. 29, 2013 Surety bonds [Member]	Sep. 30, 2012 Adjustment to Escrow under Indemnification Agreement [Member] Trapeze [Member]	Sep. 30, 2012 Adjustment to Escrow under Indemnification Agreement [Member] Trapeze [Member]
Loss Contingencies [Line Items]
Reporting Period	91 days	91 days	90 days		272 days	274 days
Fair value measurements, transfers between Level 1 and Level 2	$ 0			$ 0	$ 0	$ 0
Original maturity period of cash and cash equivalents					Three months or less
Fair value of cash and cash equivalents based on quoted market prices in active markets Level 1 valuation	70,400,000				70,400,000
Contingency accrual at carrying value															7,000,000	4,900,000	1,700,000
Operating results from discontinued operations							25,100,000	75,600,000
Gain from discontinued operations, before tax							5,700,000	17,800,000					4,000,000	4,000,000
Income from discontinued operations, after tax							4,500,000	11,700,000
Proceeds from the sales of Trapeze										152,100,000
Amount received in cash at the end of transaction										136,900,000
Amount in escrow as partial security for Company's indemnity obligations under transaction's purchase and sale agreement										15,200,000
Loss from disposal of discontinued operations, before tax																		7,000,000	7,000,000
Gain (loss) from disposal of discontinued operations				9,783,000		9,783,000					14,100,000	14,100,000						(4,300,000)	(4,300,000)
Amount collected from escrow									4,200,000
Escrow receivable									3,800,000
Gain from discontinued operations, net of tax				$ 7,125,000		$ 14,346,000							$ 2,600,000	$ 2,600,000