Other balance sheet items - Schedule of Goodwill (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Impairment losses	$ 0
Gross carrying value	87,610,000	$ 87,610,000
Accumulated impairment losses	(25,956,000)	(25,956,000)
Goodwill, Total	61,654,000	61,654,000
Yucatán Peninsula
Goodwill [Roll Forward]
Gross carrying value	51,731,000	51,731,000
Accumulated impairment losses	(6,168,000)	(6,168,000)
Goodwill, Total	45,563,000	45,563,000
Pacific Coast
Goodwill [Roll Forward]
Gross carrying value	0	0
Accumulated impairment losses	0	0
Goodwill, Total	0	0
Dominican Republic
Goodwill [Roll Forward]
Gross carrying value	0	0
Accumulated impairment losses	0	0
Goodwill, Total	0	0
Jamaica
Goodwill [Roll Forward]
Gross carrying value	35,879,000	35,879,000
Accumulated impairment losses	(19,788,000)	(19,788,000)
Goodwill, Total	$ 16,091,000	$ 16,091,000