Discontinued operations - Mexico project development- Narratives (Details) $ / shares in Units, gal in Millions							1 Months Ended
	Feb. 09, 2022 USD ($)	Feb. 09, 2022 MXN ($)	Aug. 28, 2020 USD ($)	Aug. 28, 2020 MXN ($)	Jun. 29, 2020	Aug. 22, 2016	Aug. 22, 2016 gal	Feb. 28, 2014 USD ($)	May 31, 2013 USD ($) $ / shares	Feb. 29, 2012 USD ($)	May 31, 2010 gal	Jun. 30, 2022 USD ($) ha	Dec. 31, 2020	Feb. 28, 2018	Jan. 31, 2018
Schedule of Investments [Line Items]
Land												$ 21,100,000
Period Required To Operate And Maintain Plant And Aqueduct						37 years
Number of days to submit list of non-recoverable expenses made					20 days
Amount of non-recoverable expenses			$ 51,144,525	$ 137,333,114
Litigation Settlement, Expense		$ 137,000,000
Payments For Option Exercised								$ 1,000,000.0
Minimum [Member]
Schedule of Investments [Line Items]
Loss Contingency, Damages Sought, Value	$ 51,000,000
NSC Agua [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage												50.00%
NSA [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage												50.00%
Option agreement [Member]
Schedule of Investments [Line Items]
Payments To Enter Option Agreement										$ 300,000,000
NSC Agua [Member]
Schedule of Investments [Line Items]
Total Percentage Of Ownership Interest In An Acquired Company															99.99%
Seawater Reverse Osmosis Desalination Plant Per Day Processing Capacity | gal							100				100
Area of Land | ha												20.1
Period in which construction must be completed						36 months
Payments For Option Exercised										$ 1,000,000.0
Percentage of Voting Interest Acquired through Option Agreement									25.00%	25.00%
NSC Agua [Member] | Aguas de Rosarito S.A.P.I. de C.V [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage													99.60%	0.40%
NSC Agua [Member] | First Phase [Member]
Schedule of Investments [Line Items]
Seawater Reverse Osmosis Desalination Plant Per Day Processing Capacity | gal							50
NSC Agua [Member] | Second Phase [Member]
Schedule of Investments [Line Items]
Seawater Reverse Osmosis Desalination Plant Per Day Processing Capacity | gal							50
NSC Agua [Member] | Option agreement [Member]
Schedule of Investments [Line Items]
Total Voting Interest Percentage After Conversion Of Loan									99.99%
Repayment of inter-company loan payable									$ 5,700,000
Share Price | $ / shares									$ 1