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Quarterly Financial Data (Unaudited) - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Data [Line Items] |  |  |  |  |
Asset impairment charges | $ 8,000,000 | $ 58,500,000 |  | $ 7,964,000 | $ 58,451,000
Asset impairment charges, net of tax | 7,100,000 | 44,600,000 |  |  |
Goodwill impairment |  | 39,800,000 |  | $ 0 |
Intangible asset impairment charges |  | 12,100,000 |  |  | $ 12,100,000
Certain International Renewable Energy Services [Member] |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |
Asset impairment charges | $ 8,000,000 | $ 6,600,000 |  |  |
Fiber Optic Licensing Division [Member] |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |
Gain on sale, Net of tax |  |  | $ 171,000,000 |  |

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