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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Major classes of line items constituting pretax income from discontinued operations:        
Net income (loss) from discontinued operations   $ 0 $ (342) $ 190,621
Fiber Optic Licensing Division        
Major classes of line items constituting pretax income from discontinued operations:        
Revenues     0 59,998
Cost of services (including depreciation)     0 24,748
Selling, general and administrative expenses     (980) 12,047
Amortization of intangible assets     0 963
Other income (expense) items that are not major     0 10
Net income before taxes of discontinued operations related to fiber optic licensing operations related to major classes of income before taxes     980 22,250
Pretax gain on the disposal of the fiber optic licensing operations $ 271,800   0 271,833
Total pretax gain on fiber optic licensing operations     980 294,083
Provision for income taxes related to fiber optic licensing operations     667 103,462
Net income (loss) from discontinued operations     313 190,621
Telecommunications        
Major classes of line items constituting pretax income from discontinued operations:        
Net income (loss) from discontinued operations     $ (655) $ 0