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Discontinued Operations - Summary of Financial Information for Fiber Optic Licensing Operations (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Discontinued Operations, Disposed of by Sale        
Net income (loss) from discontinued operation   $ 190,621 $ 27,490 $ 29,864
Fiber Optic Licensing Division [Member]        
Discontinued Operations, Disposed of by Sale        
Revenues   59,998 104,021 111,265
Cost of services (including depreciation)   24,748 39,295 42,745
Selling, general and administrative expenses   12,047 16,561 15,941
Amortization of intangible assets   963 1,650 1,650
Other income (expense) items that are not major   10 3  
Income (loss) from discontinued operations before taxes   22,250 46,518 50,929
Gain on disposal of discontinued operations before taxes $ 272,000 271,833    
Total pretax gain on fiber optic licensing operations   294,083 46,518 50,929
Provision for income taxes   103,462 18,401 21,065
Net income (loss) from discontinued operation   $ 190,621 28,117 $ 29,864
Telecommunications Operations [Member]        
Discontinued Operations, Disposed of by Sale        
Net income (loss) from discontinued operation     $ (627)