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Discontinued Operations - Summary of Financial Information for Fiber Optic Licensing Operations (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2015 USD ($)
Discontinued Operations, Disposed of by Sale
Net income from discontinued operations as presented in the statements of operations	$ 5,795
Fiber Optic Licensing Division [Member]
Discontinued Operations, Disposed of by Sale
Revenues	25,570
Cost of services (including depreciation)	10,815
Selling, general and administrative expenses	4,775
Amortization of intangible assets	413
Other income (expense) items that are not major	2
Income before taxes of discontinued operations	9,569
Provision for income taxes related to discontinued operations	3,774
Net income from discontinued operations as presented in the statements of operations	$ 5,795

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