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Discontinued operations - Mexico project development- Narratives (Details) $ / shares in Units, gal in Millions |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 29, 2020 | Aug. 22, 2016 | Feb. 28, 2018 | Aug. 22, 2016 gal | Nov. 30, 2015 gal | Feb. 28, 2014 USD ($) | May 31, 2013 USD ($) $ / shares | Feb. 29, 2012 USD ($) | May 31, 2010 gal | Jun. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2015 gal | Sep. 30, 2020 USD ($) ha | Dec. 31, 2018
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land |  |  |  |  |  |  |  |  |  |  |  |  | $ 21,100,000 |
Period Required To Operate And Maintain Plant And Aqueduct |  | 37 years |  |  |  |  |  |  |  |  |  |  |  |
Subscription Agreement Description |  |  | The Agreement calls for NSC to retain a minimum of 25% of the equity in AdR. One or more affiliates of Greenfield SPV VII, S.A.P.I. de C.V. (“Greenfield”), a Mexico company managed by an affiliate of a leading U.S. asset manager, would acquire a minimum of 55% of the equity of AdR. The Agreement also provided Suez MA with the option to purchase 20% of the equity of AdR. If Suez MA did not exercise this option, NSC would retain 35% of the equity of AdR and Greenfield will acquire 65% of the equity of AdR. The Agreement became effective when the certain conditions precedent related to the Project were met. The aggregate investment to be made by the equity partners in the Project, in the form of equity and subordinated shareholder loans, is presently estimated at approximately 20% of the total cost of Phase 1 of the Project. |  |  |  |  |  |  |  |  |  |  |
Number of days to submit list of non-recoverable expenses made | 20 days |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss on long-lived assets |  |  |  |  |  |  |  |  |  | $ (3,000,000.0) |  |  |  |
Adjustment to reduce operating lease right of use assets |  |  |  |  |  |  |  |  |  | 2,600,000 | $ 2,600,000 |  |  |
Adjustment to reduce operating lease liabilities |  |  |  |  |  |  |  |  |  | $ 2,200,000 | 2,200,000 |  |  |
Payments For Option Exercised |  |  |  |  |  | $ 1,000,000.0 |  |  |  |  |  |  |  |
Share Price | $ / shares |  |  |  |  |  |  | $ 1 |  |  |  |  |  |  |
Aguas de Rosarito S.A.P.I. de C.V [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 |  |  |  |  |  |
NSC Agua [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |
Total Voting Interest Percentage After Conversion Of Loan |  |  |  |  |  |  |  |  | 99.99% |  |  |  |  |
Seawater Reverse Osmosis Desalination Plant Per Day Processing Capacity | gal |  |  |  | 100 |  |  |  |  | 100 |  |  |  |  |
Area of Land | ha |  |  |  |  |  |  |  |  |  |  |  |  | 20.1 |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |
Period in which construction must be completed |  | 36 months |  |  |  |  |  |  |  |  |  |  |  |
Payments for land and rights of way held for development |  |  |  |  |  |  |  |  |  |  | $ 3,000,000.0 |  |  |
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 |  |  | 0.40% |  |  |  |  |  |  |  |  |  |  | 99.60%
NSC Agua [Member] | First Phase [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Seawater Reverse Osmosis Desalination Plant Per Day Processing Capacity | gal |  |  |  | 50 | 50 |  |  |  |  |  |  | 50 |  |
NSC Agua [Member] | Second Phase [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Seawater Reverse Osmosis Desalination Plant Per Day Processing Capacity | gal |  |  |  | 50 | 50 |  |  |  |  |  |  | 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 |  |  |  |  |  |  |
Option Agreement Expiration Date |  |  |  |  |  |  |  | Feb. 07, 2014 |  |  |  |  |  |

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