Credit Agreement Advance

Name:	hoc_CreditAgreementAdvance
Namespace Prefix:	hoc
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ Details

Name:	hoc_DebtInstrumentBasisSpreadOnVariableRate
Namespace Prefix:	hoc
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Derivative Maturity

+ Details

Name:	hoc_DerivativeMaturity
Namespace Prefix:	hoc
Data Type:	us-types:dateStringItemType
Balance Type:	na
Period Type:	duration

- Definition

Settlement Of Interest rate Derivative

+ Details

Name:	hoc_SettlementOfInterestRateDerivative
Namespace Prefix:	hoc
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Aggregate notional amount of derivative expressed in nonmonetary units. For example the number of barrels specified in a fuel oil forward purchase contract.

+ Details

Name:	invest_DerivativeNonmonetaryNotionalAmount
Namespace Prefix:	invest
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of net gains (losses) on a cash flow hedge reclassified in the period to interest expense from accumulated other comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 45
-Subparagraph b(1)

+ Details

Name:	us-gaap_CashFlowHedgeGainLossReclassifiedToInterestExpenseNet
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Fixed interest rate related to the interest rate derivative.

+ Details

Name:	us-gaap_DerivativeFixedInterestRate
Namespace Prefix:	us-gaap
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The aggregate net gain (loss) on price risk derivatives included in earnings in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 45

+ Details

Name:	us-gaap_GainLossOnPriceRiskDerivativesNet
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Decrease for amounts repaid on the credit facility for the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph f
-Article 4

+ Details

Name:	us-gaap_LineOfCreditFacilityDecreaseRepayments
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Aggregate notional amount of interest rate derivatives, which relates to the currency amount specified in the interest rate derivative instruments.

+ Details

Name:	us-gaap_NotionalAmountOfInterestRateDerivatives
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Derivative Instruments And Hedging Activities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2011	May 31, 2010 HEP [Member]	Jun. 30, 2011 HEP [Member]	Dec. 31, 2010 HEP [Member]	Jun. 30, 2010 HEP [Member] Interest Rate Swap Contracts [Member]	Jun. 30, 2011 Crude Oil [Member]	Jun. 30, 2011 Produced Gasoline [Member]
Number of barrels hedged against price volatility							210,000	3,500,000
Credit agreement advance			$ 171	$ 155	$ 155
Fixed interest rate				3.74%
Rate added to fixed base rate				2.50%
Effective interest rate on debt				6.24%
Derivative maturity				February 2013
Repayment of credit agreement debt			16
Notional amount of interest rate derivatives			16
Settlement of interest rate derivative			1.1
Reclassification from accumulated other comprehensive loss to interest expense			1.1			1.5
Increase in cost of product sold, fair value adjustment attributable to economic hedges	$ 3.0	$ 0.7