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Significant Accounting Policies and Responsibility for Financial Statements (Details) | 1 Months Ended | 3 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2018 USD ($) | Mar. 31, 2018 USD ($) MW | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Sep. 22, 2017 | Jun. 29, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jul. 08, 2016 MW | Dec. 31, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Payment defaults under agreements |  | $ 0 |  |  |  |  |  |  |
Dividends declared on common stock |  | 21,108,000 |  |  |  |  |  |  |
Revenues |  | 317,878,000 | $ 330,178,000 |  |  |  |  |  |
Total operating expenses |  | 271,746,000 | 272,080,000 |  |  |  |  |  |
Net earnings |  | 14,990,000 | 22,862,000 |  |  |  |  |  |
Accounts Receivable, Net, Current |  | 84,156,000 |  | $ 90,473,000 |  |  |  |  |
Construction work in progress |  | 284,870,000 |  | 245,933,000 |  |  |  |  |
Owners' equity |  | 1,683,614,000 |  | 1,695,253,000 |  |  |  |  |
Cash and cash equivalents |  | $ 3,783,000 | 3,283,000 | 3,974,000 |  |  | $ 5,522,000 |  |
NMRD |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Renewable energy capacity in operating (in mw) | MW |  | 21.8 |  |  |  |  |  |  |
Construction of solar generation capacity (in megawatts) | MW |  | 10 |  |  |  |  |  |  |
PNM |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Revenues |  | $ 236,232,000 | 251,558,000 |  |  |  |  |  |
Total operating expenses |  | 207,940,000 | 211,089,000 |  |  |  |  |  |
Net earnings |  | 7,837,000 | 16,658,000 |  |  |  |  |  |
Accounts Receivable, Net, Current |  | 61,908,000 |  | 67,227,000 |  |  |  |  |
Construction work in progress |  | 214,139,000 |  | 204,079,000 |  |  |  |  |
Owners' equity |  | 1,430,161,000 |  | 1,422,174,000 |  |  |  |  |
Third party deposits |  |  |  |  |  | $ 1,000,000 | 7,200,000 |  | $ 8,200,000
Cash and cash equivalents |  | 19,000 | 1,094,000 | 1,108,000 |  |  | 1,324,000 |  |
Texas-New Mexico Power Company |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Dividends declared on common stock |  | 1,024,000 | 9,900,000 |  |  |  |  |  |
Revenues |  | 81,646,000 | 78,620,000 |  |  |  |  |  |
Total operating expenses |  | 63,114,000 | 60,655,000 |  |  |  |  |  |
Net earnings |  | 9,413,000 | 7,604,000 |  |  |  |  |  |
Accounts Receivable, Net, Current |  | 22,248,000 |  | 23,246,000 |  |  |  |  |
Construction work in progress |  | 61,695,000 |  | 34,350,000 |  |  |  |  |
Owners' equity |  | $ 642,794,000 |  | 634,405,000 |  |  |  |  |
PNMR Development |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Construction of solar generation capacity (in megawatts) | MW |  | 10 |  |  |  |  |  | 10 |
PNMR Development | NMRD |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 50.00% |  |  |  |
NMRD |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Revenues |  | $ 400,000 |  |  |  |  |  |  |
Net earnings |  | 100,000 |  |  |  |  |  |  |
Cash |  | 3,900,000 |  |  |  |  |  |  |
Accounts Receivable, Net, Current |  | 400,000 |  |  |  |  |  |  |
Construction work in progress |  |  |  | 43,300,000 |  |  |  |  |
Accounts payable |  |  |  | 4,500,000 |  |  |  |  |
Owners' equity |  |  |  | $ 43,100,000 |  |  |  |  |
PNMR Development and AEP OnSite | NMRD |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Contribution to construction activities | $ 5,000,000 |  |  |  |  |  |  |  |
Accounting Standards Update 2016-18 | PNM |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  | 1,000,000 |  |  |  | 1,000,000 |  |
Accounting Standards Update 2016-18 | NMCUC |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 1,500,000 | $ 100,000 |  |  |  | $ 1,400,000 |  |

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