Acquisitions - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 11, 2014	Mar. 31, 2014	Jan. 25, 2013	Dec. 10, 2012	Jul. 30, 2012	Jul. 27, 2012	Nov. 20, 2014
Business Acquisition [Line Items]
Amortization of intangible assets	$ 58,426,000	$ 50,803,000	$ 22,792,000
Cost of sales	1,488,816,000	1,364,764,000	1,274,142,000
Prosoft Technology, Inc. [Member]
Business Acquisition [Line Items]
Percentage of outstanding shares acquired				100.00%
Acquisition price				104,100,000
Fair value of acquired receivables				5,600,000
Acquired receivable, gross contractual amount				6,200,000
Amount of acquired receivables not expected to be collected				600,000
Goodwill acquired				56,200,000
Period for deducting goodwill for tax purposes	15 years
Post acquisition revenues	31,700,000
Post acquisition income (loss) from continuing operations	(2,500,000)
Amortization of intangible assets	2,400,000
Prosoft Technology, Inc. [Member] | Inventories - Obsolescence and Other Valuation Allowances [Member]
Business Acquisition [Line Items]
Cost of sales	1,400,000
Grass Valley [Member]
Business Acquisition [Line Items]
Percentage of outstanding shares acquired					100.00%
Acquisition price					218,200,000
Fair value of acquired receivables	68,800,000
Acquired receivable, gross contractual amount	77,900,000
Amount of acquired receivables not expected to be collected	9,100,000
Goodwill acquired	119,600,000
Period for deducting goodwill for tax purposes	15 years
Post acquisition revenues	196,200,000
Post acquisition income (loss) from continuing operations	(58,500,000)
Amortization of intangible assets	8,600,000
Grass Valley [Member] | Inventories - Obsolescence and Other Valuation Allowances [Member]
Business Acquisition [Line Items]
Cost of sales	6,900,000
Softel Limited [Member]
Business Acquisition [Line Items]
Acquisition price						9,100,000
PPC Broadband, Inc. [Member]
Business Acquisition [Line Items]
Percentage of outstanding shares acquired							100.00%
Acquisition price							522,400,000
Fair value of acquired receivables							26,600,000
Acquired receivable, gross contractual amount							27,700,000
Amount of acquired receivables not expected to be collected							1,100,000
Goodwill acquired							277,100,000
Miranda Technologies Inc. [Member]
Business Acquisition [Line Items]
Percentage of outstanding shares acquired								2.63%	97.37%
Acquisition price								9,900,000	364,800,000
Fair value of acquired receivables									27,600,000
Acquired receivable, gross contractual amount									28,300,000
Amount of acquired receivables not expected to be collected									700,000
Coast Wire and Plastic Tech, LLC [Member]
Business Acquisition [Line Items]
Percentage of outstanding shares acquired										100.00%
Acquisition price										36,000,000
Grass Valley and Prosoft [Member]
Business Acquisition [Line Items]
Inventory cost step-up, pro forma disclosure		8,300,000
Amortization of intangible assets, pro forma disclosure		1,700,000
Transaction costs, pro forma disclosure		$ 1,600,000