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Income Taxes - The components of the net deferred income tax asset (liability) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Depreciation and amortization $ 8,288cik0000750813_DeferredTaxAssetsAmortizationofSeismicDataLibraryandPropertyPlantandEquipment $ 11,655cik0000750813_DeferredTaxAssetsAmortizationofSeismicDataLibraryandPropertyPlantandEquipment
Deferred revenue 716us-gaap_DeferredTaxAssetsDeferredIncome 1,932us-gaap_DeferredTaxAssetsDeferredIncome
Net operating loss carryforwards 67,148us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 73,246us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Alternative minimum tax credit carryforward 2,527us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 2,194us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Research and development tax credit carryforward 1,133us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 1,236us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Accrued expenses and other 8,153us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 8,889us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Total deferred tax assets 87,965us-gaap_DeferredTaxAssetsGross 99,152us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:    
Depreciation and amortization (7,870)cik0000750813_DeferredTaxLiabilitiesAmortizationofSeismicDataLibraryandPropertyPlantandEquipment (8,914)cik0000750813_DeferredTaxLiabilitiesAmortizationofSeismicDataLibraryandPropertyPlantandEquipment
Intangible assets (3,276)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (4,784)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Deferred expenses and other (409)us-gaap_DeferredTaxLiabilitiesDeferredExpense (521)us-gaap_DeferredTaxLiabilitiesDeferredExpense
Total deferred tax liabilities (11,555)us-gaap_DeferredIncomeTaxLiabilities (14,219)us-gaap_DeferredIncomeTaxLiabilities
Valuation allowance:    
Beginning balance 0us-gaap_DeferredTaxAssetsValuationAllowance (100,492)us-gaap_DeferredTaxAssetsValuationAllowance
Decrease during the period 0us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount 100,492us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Total valuation allowance 0us-gaap_DeferredTaxAssetsValuationAllowance 0us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax asset 76,410us-gaap_DeferredTaxAssetsLiabilitiesNet 84,933us-gaap_DeferredTaxAssetsLiabilitiesNet
Deferred income tax liability (5,334)us-gaap_DeferredTaxLiabilities (7,578)us-gaap_DeferredTaxLiabilities
Deferred income tax asset $ 81,744us-gaap_DeferredTaxAssetsNet $ 92,511us-gaap_DeferredTaxAssetsNet