Consolidated Statements of Changes in Equity (USD $) In Thousands, unless otherwise specified	Total	Preferred Stock, Series A [Member]	Common Stock [Member]	AOCI [Member]	Retained Earnings [Member]	Total PNMR Common Stockholders' Equity [Member]	Non-controlling Interest in Valencia [Member]	Public Service Company of New Mexico [Member]	Public Service Company of New Mexico [Member] Common Stock [Member]	Public Service Company of New Mexico [Member] AOCI [Member]	Public Service Company of New Mexico [Member] Retained Earnings [Member]	Public Service Company of New Mexico [Member] Total PNMR Common Stockholders' Equity [Member]	Public Service Company of New Mexico [Member] Non-controlling Interest in Valencia [Member]	Texas-New Mexico Power Company [Member]	Texas-New Mexico Power Company [Member] Common Stock [Member]	Texas-New Mexico Power Company [Member] Additional Paid-in Capital [Member]	Texas-New Mexico Power Company [Member] AOCI [Member]	Texas-New Mexico Power Company [Member] Retained Earnings [Member]
Balance at Dec. 31, 2010	$ 1,721,919	$ 100,000	$ 1,290,465	$ (68,666)	$ 314,943	$ 1,536,742	$ 85,177	$ 1,208,526	$ 1,018,776	$ (66,786)	$ 171,359	$ 1,123,349	$ 85,177
Balance TNMP at Dec. 31, 2010														453,283	64	430,108	(1,485)	24,596
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Proceeds from stock option exercises	5,622	0	5,622	0	0	5,622	0
Net earnings (loss)	176,359							54,491						22,257	0	0	0	22,257
Purchases to satisfy awards of common stock	(10,104)	0	(10,104)	0	0	(10,104)	0
Stock based compensation expense	6,556	0	6,556	0	0	6,556	0
Valencia’s transactions with its owner	(16,801)	0	0	0	0	0	(16,801)	(16,801)	0	0	0	0	(16,801)
Purchase of preferred stock	(73,510)	(100,000)	26,490	0	0	26,490	0
Purchase of common stock	(125,838)	0	(125,838)	0	0	(125,838)	0
Net earnings	190,934	0	0	0	176,887	176,887	14,047	68,538	0	0	54,491	54,491	14,047
Subsidiary preferred stock dividends	(528)	0	0	0	(528)	(528)	0
Total other comprehensive income	1,810	0	0	1,810	0	1,810	0	(12)	0	(12)	0	(12)	0	1,427	0	0	1,427	0
Equity contributions from parent								43,000	43,000	0	0	43,000	0
Dividends declared on preferred stock								(528)	0	0	(528)	(528)	0
Dividends declared on common stock	(43,652)	0	0	0	(43,652)	(43,652)	0	(8,211)	0	0	(8,211)	(8,211)	0	(13,714)	0	(13,714)	0	0
Balance TNMP at Dec. 31, 2011														463,253	64	416,394	(58)	46,853
Balance at Dec. 31, 2011	1,656,408	0	1,193,191	(66,856)	447,650	1,573,985	82,423	1,294,512	1,061,776	(66,798)	217,111	1,212,089	82,423
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	17,080							17,812						3,011
Net earnings	20,477							21,077
Balance TNMP at Mar. 31, 2012
Balance at Dec. 31, 2011	1,656,408	0	1,193,191	(66,856)	447,650	1,573,985	82,423	1,294,512	1,061,776	(66,798)	217,111	1,212,089	82,423
Balance TNMP at Dec. 31, 2011														463,253	64	416,394	(58)	46,853
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Proceeds from stock option exercises	11,684	0	11,684	0	0	11,684	0
Net earnings (loss)	105,547							91,551						26,747	0	0	0	26,747
Purchases to satisfy awards of common stock	(25,168)	0	(25,168)	0	0	(25,168)	0
Excess tax (shortfall) from stock-based payment arrangements	(473)	0	(473)	0	0	(473)	0
Stock based compensation expense	3,585	0	3,585	0	0	3,585	0
Valencia’s transactions with its owner	(15,630)	0	0	0	0	0	(15,630)	(15,630)	0	0	0	0	(15,630)
Net earnings	120,125	0	0	0	106,075	106,075	14,050	105,601	0	0	91,551	91,551	14,050
Subsidiary preferred stock dividends	(528)	0	0	0	(528)	(528)	0
Total other comprehensive income	(14,774)	0	0	(14,774)	0	(14,774)	0	(14,616)	0	(14,616)	0	(14,616)	0	(158)	0	0	(158)	0
Dividends declared on preferred stock								(528)	0	0	(528)	(528)	0
Dividends declared on common stock	(46,199)	0	0	0	(46,199)	(46,199)	0	(34,433)	0	0	(34,433)	(34,433)	0	(26,028)	0	(26,028)	0	0
Balance TNMP at Dec. 31, 2012	1,608,187							1,254,063						463,814	64	390,366	(216)	73,600
Balance at Dec. 31, 2012	1,689,030	0	1,182,819	(81,630)	506,998	1,608,187	80,843	1,334,906	1,061,776	(81,414)	273,701	1,254,063	80,843
Balance at Sep. 30, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	9,091							5,943						6,634
Net earnings	12,573							9,293
Balance TNMP at Dec. 31, 2012	1,608,187							1,254,063						463,814
Balance at Dec. 31, 2012	1,689,030							1,334,906
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	10,626							11,569						3,726
Net earnings	13,962							14,773
Balance TNMP at Mar. 31, 2013
Balance at Dec. 31, 2012	1,689,030	0	1,182,819	(81,630)	506,998	1,608,187	80,843	1,334,906	1,061,776	(81,414)	273,701	1,254,063	80,843
Balance TNMP at Dec. 31, 2012	1,608,187							1,254,063						463,814	64	390,366	(216)	73,600
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Proceeds from stock option exercises	4,618	0	4,618	0	0	4,618	0
Net earnings (loss)	100,507							88,155						29,090	0	0	0	29,090
Purchases to satisfy awards of common stock	(13,807)	0	(13,807)	0	0	(13,807)	0
Excess tax (shortfall) from stock-based payment arrangements	(581)	0	(581)	0	0	(581)	0
Stock based compensation expense	5,320	0	5,320	0	0	5,320	0
Valencia’s transactions with its owner	(18,335)	0	0	0	0	0	(18,335)	(18,335)	0	0	0	0	(18,335)
Net earnings	115,556	0	0	0	101,035	101,035	14,521	102,676	0	0	88,155	88,155	14,521
Subsidiary preferred stock dividends	(528)	0	0	0	(528)	(528)	0
Total other comprehensive income	23,490	0	0	23,490	0	23,490	0	23,537	0	23,537	0	23,537	0	(47)	0	0	(47)	0
Equity contributions from parent														13,800	0	13,800	0	0
Dividends declared on preferred stock								(528)	0	0	(528)	(528)	0
Dividends declared on common stock	(54,165)	0	0	0	(54,165)	(54,165)	0	(155,028)	0	0	(155,028)	(155,028)	0	(3,726)	0	0	0	(3,726)
Balance TNMP at Dec. 31, 2013	1,673,569							1,210,199						502,931	64	404,166	(263)	98,964
Balance at Dec. 31, 2013	1,750,598	0	1,178,369	(58,140)	553,340	1,673,569	77,029	1,287,228	1,061,776	(57,877)	206,300	1,210,199	77,029
Balance at Sep. 30, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	7,648							2,639						6,919
Net earnings	11,397							6,256
Balance TNMP at Dec. 31, 2013	1,673,569							1,210,199						502,931
Balance at Dec. 31, 2013	$ 1,750,598							$ 1,287,228