Trade receivables (Tables)

12 Months Ended

Dec. 31, 2020

Trade receivables [Abstract]

Summary of Trade Receivables

Trade receivables as of December 31, 2020 and 2019, are summarized as follows:

	2020			2019
Maritime
Shipyard	$	40,979		$	34,325
Tugboats		13,981			19,406
Parcel tankers		14,485			18,217
Offshore vessels		29,864			4,737
Bulk carrier		98			906
Others		-			173
Ports and terminals
Shipping agencies		331			128,300
Port services		7,152			10,732
Commercial leases		106			93
Logistics, warehousing and other businesses
Warehousing		27,145			44,820
Repair of containers		16,204			28,986
Automotive services		1,021			1,112
Other businesses		-			1,165
Total trade receivables		151,366			292,972
Contract assets		56,215			65,443
Allowance for doubtful accounts		(21,218	)		(14,385	)
	$	186,363		$	344,030

Activity in Allowance for Doubtful Accounts

The activity in the allowance for doubtful accounts is presented below:

	2020			2019
Balance as of January 1	$	14,385		$	22,303
Impairment loss for the period		20,140			-
Receivables written off during the year		-			(1,847	)
Allowance cancelation recognized during the year		(13,307	)		(6,071	)
Balance as of December 31	$	21,218		$	14,385