Discontinued Operations - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended	1 Months Ended	3 Months Ended	6 Months Ended
	Jun. 27, 2014	Jun. 28, 2013 segment	Jun. 27, 2014	Jun. 28, 2013	Jun. 27, 2014 HFC business [Member]	Jun. 28, 2013 HFC business [Member]	Jun. 28, 2013 HFC business [Member]	Mar. 05, 2013 Aurora [Member] HFC business [Member]	Jun. 28, 2013 Aurora [Member] HFC business [Member]	Jun. 28, 2013 Aurora [Member] HFC business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross proceeds from sale of cable access HFC business							$ 46,000,000	$ 46,000,000
Gain on disposal, net of taxes			0	14,819,000		(137,000)	14,819,000		14,800,000	15,000,000
Adjustment to prior period gain (loss) on disposal, net of tax										200,000
Number of reporting units (in segment)		1
Carrying value of goodwill based on the fair value						14,547,000	14,547,000
Goodwill impairment							0
Operating Income (Loss)	$ (8,649,000)	$ (4,604,000)	$ (15,871,000)	$ (19,471,000)	$ 0