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Commitments and Contingencies - Narrative (Details) a in Thousands, gal in Millions, $ in Millions |  |  |  | 1 Months Ended | 2 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 11, 2019 License | Jan. 07, 2019 gal | Apr. 10, 2015 plaintiff | May 31, 2016 | Dec. 31, 2015 plaintiff | Jan. 31, 2019 | Mar. 31, 2020 USD ($) joint_venture | Dec. 31, 2018 a License
East Maui Irrigation Company, LLC (EMI) |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Interest held in EMI (percent) |  |  |  |  |  | 50.00% |  |
East Maui Irrigation Company, LLC (EMI) | Maui |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Area of land sold (acres) | a |  |  |  |  |  |  |  | 41
East Maui Irrigation Company, LLC (EMI) | East Maui |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Watershed lands owned (in acres) | a |  |  |  |  |  |  |  | 16
State of Hawai'i | East Maui |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of water licenses held and extended as revocable permits | License |  |  |  |  |  |  |  | 4
Additional watershed lands accessible by licenses (in acres) | a |  |  |  |  |  |  |  | 30
Bid, Performance and Payment Bonds and Commercial Bonds |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Possible administrative penalty |  |  |  |  |  |  | $ 400.8 |
Estimated remaining exposure |  |  |  |  |  |  | 54.9 |
Performance Bond |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Possible administrative penalty |  |  |  |  |  |  | $ 381.5 |
Long Term Water Lease Request |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of water licenses held and extended as revocable permits | License | 4 |  |  |  |  |  |  |
Number of parties filed lawsuit | plaintiff |  |  | 3 |  | 3 |  |  |
Duration of revocable permits for disposition of water rights | 1 year |  |  | 3 years |  |  |  |
Sierra Club Lawsuit Against BLNR, A&B, and EMI |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of gallons per day sought to be enjoined (gallons) | gal |  | 25 |  |  |  |  |  |
Financial Guarantee |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of joint ventures | joint_venture |  |  |  |  |  |  | 1 |
Guarantor obligations, current carrying value |  |  |  |  |  |  | $ 3.1 |
Letters of Credit |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Standby letters of credit outstanding |  |  |  |  |  |  | $ 1.7 |

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