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Income Taxes - Difference Between Corporation's Effective Income Tax Rate from Continuing Operations and U.S. Statutory Rate (Detail)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
U.S. statutory rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Effect of foreign operations 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential 6.90%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential 12.50%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
State income taxes, net of Federal income tax 1.50%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 0.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Change in enacted tax laws   (14.80%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate 3.40%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate
Gains on asset sales, net (8.30%)hes_GainOnAssetSalesNetPercentage (15.60%)hes_GainOnAssetSalesNetPercentage (5.40%)hes_GainOnAssetSalesNetPercentage
Other 1.30%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.70%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Total 30.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations 12.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations 45.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations