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Wireless Licenses, Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Billions	1 Months Ended		9 Months Ended
	Feb. 28, 2018	Jan. 31, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Wireless Licenses
Indefinite-lived Intangible Assets [Line Items]
Wireless licenses under development			$ 11.1		$ 8.8
Interest costs capitalized			$ 0.4	$ 0.4
Average remaining renewal period of wireless license portfolio (in years)			4 years 9 months
Straight Path Communications Inc. \| Wireless Licenses
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets acquired	$ 4.5
XO Holdings \| Wireless Licenses
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets acquired		$ 0.7
Selling, general and administrative expense
Indefinite-lived Intangible Assets [Line Items]
Goodwill impairment charge			$ 0.1