Discontinued Operations - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended			0 Months Ended	12 Months Ended			0 Months Ended	12 Months Ended			0 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 17, 2012 Thermax and Raydex [Member]	Dec. 31, 2013 Thermax and Raydex [Member]	Dec. 31, 2012 Thermax and Raydex [Member]	Dec. 31, 2011 Thermax and Raydex [Member]	Dec. 31, 2010 Trapeze [Member]	Dec. 31, 2012 Trapeze [Member]	Dec. 31, 2011 Trapeze [Member]	Dec. 31, 2013 Trapeze [Member]	Dec. 31, 2012 Communications cable operation in Phoenix, Arizona [Member] Uncertain tax positions liability [Member]	Dec. 31, 2012 Communications cable operation in Phoenix, Arizona [Member] Uncertain tax positions liability [Member] Reversal of accrued interest and penalties [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amount received in cash from the sales of business units						$ 265,600,000				$ 152,100,000
Gain/(Loss) on disposal of discontinued operations, before tax						211,600,000				88,300,000	(7,000,000)
Gain/(Loss) on disposal of discontinued operations, net of tax	124,697,000	9,783,000		134,480,000		124,700,000				44,800,000	(4,300,000)			14,100,000
Income tax expense for discontinued operations			1,400,000	78,700,000	7,600,000		1,400,000
Net current liability of discontinued operations	86,860,000			86,860,000				86,900,000
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
Receivable, net	300,864,000		304,204,000	300,864,000									3,800,000
Partial settlement received from escow			4,200,000
Income/(Loss) from Discontinued Operations, before tax				25,459,000	20,647,000			21,479,000	21,792,000			(196,000)			4,000,000
Income/(Loss) from Discontinued Operations, net of tax															$ 2,600,000