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Significant Accounting Policies and Responsibility for Financial Statements (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) $ / shares MW | Dec. 31, 2017 USD ($) power_purchase_agreement | Jun. 30, 2017 USD ($) $ / shares | Jun. 30, 2018 USD ($) $ / shares MW | Jun. 30, 2017 USD ($) $ / shares | Sep. 30, 2017 | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Payment defaults under agreements |  | $ 0 |  |  | $ 0 |  |  |  |
Dividends declared per common share (dollars per share) | $ / shares |  | $ 0.2650 |  | $ 0.2425 | $ 0.53 | $ 0.4850 |  |  |
Dividends declared on common stock |  |  |  |  | $ 21,108,000 |  |  |  |
Revenues |  | $ 352,313,000 |  | $ 362,320,000 | 670,191,000 | $ 692,498,000 |  |  |
Construction work in progress |  | 220,065,000 | $ 245,933,000 |  | 220,065,000 |  |  |  |
Owners' equity |  | 1,722,715,000 | 1,695,253,000 |  | 1,722,715,000 |  |  |  |
Cash and cash equivalents |  | $ 4,889,000 | 3,974,000 | 2,193,000 | $ 4,889,000 | 2,193,000 |  | $ 5,522,000 |
NMRD |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Renewable energy capacity in operating (in mw) | MW |  | 31.8 |  |  | 31.8 |  |  |  |
PNM |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Revenues |  | $ 264,511,000 |  | 276,097,000 | $ 500,742,000 | 527,655,000 |  |  |
Net earnings |  | 26,672,000 |  | 26,932,000 | 34,510,000 | 43,591,000 |  |  |
Construction work in progress |  | 114,535,000 | 204,079,000 |  | 114,535,000 |  |  |  |
Owners' equity |  | 1,458,012,000 | 1,422,174,000 |  | 1,458,012,000 |  |  |  |
Third party deposits |  |  |  | 1,000,000 |  | 1,000,000 |  | 7,200,000 | $ 8,200,000
Cash and cash equivalents |  | $ 2,874,000 | 1,108,000 | $ 26,000 | 2,874,000 | 26,000 |  | 1,324,000 |
Texas-New Mexico Power Company |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Dividends declared per common share (dollars per share) | $ / shares |  | $ 0.2650 |  | $ 0.2425 |  |  |  |  |
Dividends declared on common stock |  |  |  |  | 10,436,000 | 17,500,000 |  |  |
Revenues |  | $ 87,802,000 |  | $ 86,223,000 | 169,449,000 | 164,843,000 |  |  |
Net earnings |  | 15,367,000 |  | 12,204,000 | 24,779,000 | 19,808,000 |  |  |
Construction work in progress |  | 94,810,000 | 34,350,000 |  | 94,810,000 |  |  |  |
Owners' equity |  | 648,748,000 | 634,405,000 |  | 648,748,000 |  |  |  |
Cash and cash equivalents |  | $ 0 | 1,700,000 |  | $ 0 |  |  |  |
PNMR Development |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Solar generation capacity (in megawatts) | MW |  | 30 |  |  | 30 |  |  |  |
PNMR Development | NMRD |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  | 50.00% |  |
NMRD |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Revenues |  | $ 1,100,000 |  |  | $ 1,500,000 |  |  |  |
Net earnings |  | 400,000 |  |  | 500,000 |  |  |  |
Cash |  | 2,000,000 |  |  | 2,000,000 |  |  |  |
Construction work in progress |  | 47,900,000 |  |  | 47,900,000 |  |  |  |
Accounts payable |  | 400,000 |  |  | 400,000 |  |  |  |
Owners' equity |  | $ 49,500,000 |  |  | 49,500,000 |  |  |  |
PNMR Development and AEP OnSite | NMRD |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Contribution to construction activities |  |  |  |  | $ 8,000,000 |  |  |  |
Accounting Standards Update 2016-18 | PNM |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  | $ 1,000,000 |  | $ 1,000,000 |  | $ 1,000,000 |
Accounting Standards Update 2016-18 | NMCUC |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  | $ 100,000 |  |  |  |  |  |
Subsequent event | Texas-New Mexico Power Company |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Dividends declared on cash | $ 15,400,000 |  |  |  |  |  |  |  |
Facebook Data Center |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of additional PPAs | power_purchase_agreement |  |  | 3 |  |  |  |  |  |
Power purchase agreement term |  |  | 25 years |  |  |  |  |  |

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