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Related Party Transactions (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Related Party Transaction [Line Items]      
Advances to Seitel Holdings, Inc. $ 13,000us-gaap_PaymentsForAdvanceToAffiliate $ 256,000us-gaap_PaymentsForAdvanceToAffiliate $ 13,000us-gaap_PaymentsForAdvanceToAffiliate
Due from Seitel Holdings, Inc. 1,143,000us-gaap_DueFromRelatedParties 1,130,000us-gaap_DueFromRelatedParties  
Seitel Holdings, Inc. [Member]      
Related Party Transaction [Line Items]      
Advances to Seitel Holdings, Inc. 13,000us-gaap_PaymentsForAdvanceToAffiliate
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_PrincipalOwnerMember		 256,000us-gaap_PaymentsForAdvanceToAffiliate
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_PrincipalOwnerMember		 13,000us-gaap_PaymentsForAdvanceToAffiliate
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_PrincipalOwnerMember
Due from Seitel Holdings, Inc. 1,100,000us-gaap_DueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_PrincipalOwnerMember		 1,100,000us-gaap_DueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_PrincipalOwnerMember		  
Wandoo Energy LLC [Member]      
Related Party Transaction [Line Items]      
Cost method investment, ownership percentage 20.00%cik0000750813_CostMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cik0000750813_WandooEnergyLlcMember		    
Proceeds from cash dividends $ 72,000us-gaap_ProceedsFromDividendsReceived
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cik0000750813_WandooEnergyLlcMember		 $ 76,000us-gaap_ProceedsFromDividendsReceived
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cik0000750813_WandooEnergyLlcMember		 $ 552,000us-gaap_ProceedsFromDividendsReceived
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cik0000750813_WandooEnergyLlcMember