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Lease Commitments - Schedule of Rent Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
PNMR [Member]      
Operating lease expense [Line Items]      
Operating lease expense $ 68,652 $ 82,756 $ 82,882
Public Service Company of New Mexico [Member]      
Operating lease expense [Line Items]      
Operating lease expense 63,558 76,745 78,306
Texas-New Mexico Power Company [Member]      
Operating lease expense [Line Items]      
Operating lease expense $ 3,688 $ 3,932 $ 2,663