Acquisitions - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended		0 Months Ended		3 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended	0 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013	Jan. 25, 2013 Softel Limited [Member]	Mar. 31, 2014 Grass Valley [Member]	Jun. 29, 2014 Grass Valley [Member]	Jun. 29, 2014 Grass Valley [Member]	Mar. 31, 2014 Grass Valley [Member]	Jun. 29, 2014 Grass Valley [Member] Inventories - Obsolescence and Other Valuation Allowances [Member]	Jun. 29, 2014 Grass Valley [Member] Inventories - Obsolescence and Other Valuation Allowances [Member]	Jun. 11, 2014 Prosoft Technology, Inc. [Member]	Jun. 29, 2014 Prosoft Technology, Inc. [Member]	Jun. 29, 2014 Prosoft Technology, Inc. [Member]	Jun. 29, 2014 Prosoft Technology, Inc. [Member] Inventories - Obsolescence and Other Valuation Allowances [Member]	Jun. 29, 2014 Prosoft Technology, Inc. [Member] Inventories - Obsolescence and Other Valuation Allowances [Member]	Jun. 30, 2013 Grass Valley And Prosoft [Member]
Business Acquisition [Line Items]
Percentage of outstanding shares acquired									100.00%			100.00%
Acquisition price					$ 9,100,000	$ 218,000,000						$ 105,000,000
Fair value of acquired receivables							73,300,000	73,300,000					6,000,000	6,000,000
Acquired receivable, gross contractual amount							79,000,000	79,000,000					6,100,000	6,100,000
Amount of acquired receivables not expected to be collected							5,700,000	5,700,000					100,000	100,000
Goodwill acquired							106,200,000	106,200,000					55,300,000	55,300,000
Period for deducting goodwill for tax purposes							15 years						15 years
Post acquisition revenues							66,800,000	66,800,000					2,700,000	2,700,000
Post acquisition income (loss) from continuing operations							(22,900,000)	(22,900,000)					(400,000)	(400,000)
Amortization of intangible assets	15,795,000	13,105,000	27,536,000	26,082,000			3,800,000	3,800,000					300,000	300,000
Transaction cost included in selling, general and administrative expenses							100,000	1,000,000					600,000	600,000
Cost of sales	396,506,000	350,295,000	708,479,000	690,415,000						6,900,000	6,900,000				500,000	500,000
Inventory cost step-up, pro forma disclosure																	10,200,000
Amortization of intangible assets, pro forma disclosure																	1,900,000
Transaction costs, pro forma disclosure																	$ 1,600,000