INCOME TAXES - Narrative (Details) (USD $)	12 Months Ended			3 Months Ended	12 Months Ended				3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Ergotron, Inc [Member]	Dec. 31, 2013 Internal Revenue Service (IRS) [Member]	Dec. 31, 2013 Internal Revenue Service (IRS) [Member] 2GIG Technologies, Inc. [Member]	Dec. 31, 2013 Foreign Tax Authority [Member]	Dec. 31, 2013 Statute of Limitations Expected to Expire [Member] State and Local Jurisdiction [Member]	Mar. 30, 2013 Disputes with Taxing Authority [Member] State and Local Jurisdiction [Member]	Dec. 31, 2013 Value Added Tax Audit [Member] Foreign Tax Authority [Member]	Dec. 31, 2013 Foreign Intercompany Transactions Deferred Tax Asset [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Deferred state tax expense (benefit)	$ (4,200,000)	$ 1,000,000	$ (8,300,000)
Income taxes paid (refunded)	12,200,000	5,900,000	(4,600,000)
Total deferred tax assets	159,200,000	168,200,000
Total deferred tax liabilities	242,400,000	229,400,000
Total valuation allowance	46,200,000	42,200,000
Undistributed earnings of foreign subsidiaries	45,000,000
Undistributed earnings of foreign subsidiaries, taxed	24,700,000
Operating loss carryforwards					7,000,000	4,000,000	96,000,000
Operating loss carryforwards, share-based compensation					13,700,000
Tax benefit recognized from compensation expense					4,800,000
Operating loss carryforwards with indefinite carry-forward period							85,200,000
Uncertain tax positions	22,800,000	26,400,000
Unrecognized tax benefits	32,600,000	34,500,000	34,200,000
Increase in uncertain tax positions										800,000	1,800,000
Increase in deferred tax assets											1,800,000
Amount of unrecorded benefit								3,900,000	2,300,000
Income tax penalties and interest expense (benefit)	(300,000)	500,000	(600,000)						800,000
Decreases due to expiration of statutes of limitations	4,300,000	1,600,000		2,100,000					700,000
Provision for income taxes	(3,100,000)	15,300,000	(20,300,000)						1,600,000
Uncertain tax positions that will impact effective tax rate	12,800,000	14,600,000
Amount of accrued interest	2,100,000	2,800,000
Uncertain tax positions	$ 24,900,000	$ 29,200,000								$ 700,000