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Discontinued Operations - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Aug. 04, 2015
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Telecommunications Operations [Member]        
Discontinued Operations [Line Items]        
Legal fees       $ 1,000
Legal fees, net of tax impact       $ 600
Fiber Optic Licensing Division [Member]        
Discontinued Operations [Line Items]        
Sales price of fiber optic licensing operations $ 1,000,000      
Net cash proceeds from sale of fiber optic licensing operations $ 848,000      
Gain on disposal of discontinued operations before taxes   $ 272,000 $ 271,833  
Tax amount from gain loss of disposal of discontinued operations   101,000    
Gain on sale, Net of tax   $ 171,000