Trade Accounts Receivable, Net (Tables)

12 Months Ended

Dec. 31, 2018

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Summary of Trade Accounts Receivables

At December 31 this account comprises:

	2017					2018
	Current			Non-current		Current			Non-current
Invoice receivables		459,722			819,699		907,007			469,510
Unbilled receivables		1,069,299			87,888		113,464			550,557
		1,529,021			907,587		1,020,471			1,020,067
(-) Impairment of account receivables		(13,348	)		—		(12,643	)		—
		1,515,673			907,587		1,007,828			1,020,067

Schedule of Current and Non-Current Unbilled Receivables

At December 31, 2018, current and non-current unbilled receivables mainly from the following subsidiaries are as follows:

Unbilled receivables	2017		2018
GyM S.A.		581,946		14,455
GyM Ferrovias		354,763		558,179
Concar S.A.		52,508		38,770
Survial S.A.		30,647		19,138
GMI S.A.		19,699		26,622
Norvial S.A.		7,057		2,885
Cam Holding SPA		85,366		—
Others		25,201		3,972
		1,157,187		664,021

Summary of Aging of Trade Accounts Receivable

Aging of trade accounts receivable is as follows:

	2017		2018
Current		2,157,656		1,866,913
Past due up to 30 days		118,158		37,750
Past due from 31 days up to 180 days		141,120		25,854
Past due from 181 days up to 360 days		1,962		17,660
Past due over 360 days		17,712		92,361
		2,436,608		2,040,538