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Discontinued Operations - Additional Information (Detail) (USD $) |  |  | 3 Months Ended | 1 Months Ended
--- | --- | --- | --- | ---
Mar. 29, 2013 | Dec. 31, 2012 | Mar. 29, 2013 HFC business [Member] | Mar. 29, 2013 Aurora [Member] | Mar. 05, 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
Net gain from sale of HFC business |  |  |  |  | 15,000,000
TSA billing to Aurora |  |  |  | 328,000 |
Prepaid expenses and other current assets | 28,977,000 | 23,636,000 |  | 1,700,000 |
Receivables from customers |  |  |  | 3,000,000 |
Accrued liabilities |  |  |  | 1,400,000 |
Payable to third party vendors for purchases |  |  |  | 2,900,000 |
Goodwill impairment loss |  |  | 0 |  |
Carrying value of goodwill based on the fair value | $ 14,547,000 |  | $ 14,547,000 |  |

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