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Regulatory matters - Regulatory Assets and Liabilities (Detail) $ in Thousands | Jun. 30, 2020 USD ($) | Mar. 01, 2020 jurisdiction | Dec. 31, 2019 USD ($)
--- | --- | --- | ---
Regulatory Liabilities [Line Items] |  |  |
Total regulatory assets | $ 753,641 |  | $ 559,887
Less: current regulatory assets | (43,558) |  | (50,213)
Non-current regulatory assets | 710,083 |  | 509,674
Total regulatory liabilities | 608,826 |  | 598,062
Less: current regulatory liabilities | (31,720) |  | (41,683)
Non-current regulatory liabilities | 577,106 |  | 556,379
Income taxes |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory liabilities | 331,991 |  | 321,960
Cost of removal |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory liabilities | 195,277 |  | 196,423
Rate base offset |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory liabilities | 7,342 |  | 8,719
Fuel and commodity costs adjustments |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory liabilities | 19,090 |  | 16,645
Rate adjustment mechanism |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory liabilities | 4,514 |  | 10,446
Deferred capitalized costs - fuel related |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory liabilities | 7,017 |  | 7,097
Pension and post-employment benefits |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory liabilities | 24,460 |  | 22,256
Other |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory liabilities | 19,135 |  | 14,516
Retired generating plant |  |  |
Regulatory Liabilities [Line Items] |  |  |
Number of Commission Jurisdictions | jurisdiction |  | 3 |
Total regulatory assets | 196,476 |  | 0
Environmental remediation |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory assets | 88,914 |  | 82,300
Pension and post-employment benefits |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory assets | 136,901 |  | 143,292
Income taxes |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory assets | 73,662 |  | 71,506
Debt premium |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory assets | 38,462 |  | 42,150
Fuel and commodity costs adjustments |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory assets | 7,736 |  | 23,433
Rate adjustment mechanism |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory assets | 77,173 |  | 69,121
Clean energy and other customer programs |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory assets | 26,510 |  | 26,369
Deferred capitalized costs |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory assets | 37,920 |  | 38,833
Asset retirement obligation |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory assets | 25,631 |  | 23,841
Long-term maintenance contract |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory assets | 14,913 |  | 13,264
Rate review costs |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory assets | 7,000 |  | 6,695
Other |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory assets | $ 22,343 |  | $ 19,083

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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