Financial Instruments (Details) (USD $)			6 Months Ended	3 Months Ended	6 Months Ended
Jun. 30, 2011 HEP [Member]	Dec. 31, 2010 HEP [Member]	Jun. 30, 2011 HEP [Member] 6.25% Senior Notes Due 2015 [Member]	Mar. 31, 2011 HEP [Member] 8.25% Senior Notes Due 2018 [Member]	Jun. 30, 2011 HEP [Member] 8.25% Senior Notes Due 2018 [Member]	Jun. 30, 2011 HEP [Member] HEP Credit Agreement [Member]	Jun. 30, 2011 9.875% Senior Notes Due 2017 [Member]
Maximum borrowing capacity under revolving credit agreement						$ 275,000,000
Borrowings outstanding under revolving credit agreement	186,000,000	159,000,000				186,000,000
Percentage interest on debt instrument			6.25%	8.25%	8.25%		9.875%
Senior notes maturity date			March 2015	March 2018	2018	February 2016	June 2017
Estimated fair value of senior notes			$ 184,100,000		$ 159,400,000		$ 333,800,000

Debt instruments maturity date

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

- Definition

Estimated fair value of the debt instrument at the balance-sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 10

+ Details

Name:	us-gaap_DebtInstrumentFairValue
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Interest rate stated in the contractual debt agreement.

+ 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_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount borrowed under the credit facility as of the balance-sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 22
-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 22
-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant