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Discontinued Operations - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 04, 2015 | Sep. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Current liabilities of discontinued operations |  |  |  | $ 15,313,000 |
Fiber Optic Licensing Division [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Sales price of fiber optic licensing operations | $ 1,000,000,000 |  |  |  |
Net cash proceeds from sale of fiber optic licensing operations | $ 848,000,000 |  |  |  |
Gain on disposal of discontinued operations before taxes |  | $ 272,000,000 |  | 271,833,000 |
Tax amount from gain loss of disposal of discontinued operations |  | 101,000,000 |  |  |
Gain on sale, Net of tax |  | $ 171,000,000 |  |  |
Assets of fiber optic licensing operations |  |  | $ 0 | 0 |
Current liabilities of discontinued operations |  |  | 0 |  |
Non-current liabilities of discontinued operations |  |  | 0 | $ 0 |
Telecommunications [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Legal fees |  |  | 1,000,000 |  | $ 1,000,000
Legal fees, net of tax impact |  |  | $ 700,000 |  | $ 600,000

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