Consolidated Statements Of Cash Flows (Parenthetical) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Aug. 15, 2016
Provision for doubtful accounts	[1]	$ 1,498	$ 20,516
5.75% Senior Notes [Member]
Debt instrument stated percentage		5.75%		5.75%	5.75%
Oi S.A. [Member]
Provision for doubtful accounts			$ 16,498

[1] Includes the impact of the $16,498 Oi reserve for the nine months ended September 30, 2016.