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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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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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