Debt Instrument Maturity Year

No definition available.

Name:	hos_DebtInstrumentMaturityYear
Namespace Prefix:	hos_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611

+ Details

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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=hos_SeniorNotesFivePointEightSevenFivePercentDueTwentyTwentyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=hos_SeniorNotesFivePointZeroZeroZeroPercentDueTwentyTwentyOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=hos_ConvertibleOnePointFivePercentSeniorNotesDueTwentyNineteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=hos_FirstLienCreditFacilityMaturingTwentyTwentyThreeMemberDomain
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Long-Term Debt - Annual Maturities of Debt (Details) - USD ($) $ in Thousands		12 Months Ended
	Aug. 13, 2012	Dec. 31, 2017	Dec. 31, 2015	Dec. 31, 2012	Dec. 31, 2016	Mar. 02, 2012
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure		$ 717,955			$ 788,476
Debt Instrument, Face Amount		1,079,911			1,125,000
Senior Notes Five Point Eight Seven Five Percent Due Twenty Twenty [Member]
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure		244,714			270,938
Debt Instrument, Face Amount		366,942			375,000	$ 375,000
Debt Instrument Maturity Year				2020
Debt Instrument, Maturity Date				Apr. 01, 2020
Senior Notes Five Point Zero Zero Zero Percent Due Twenty Twenty One [Member]
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure		236,250			301,343
Debt Instrument, Face Amount		450,000			450,000
Debt Instrument Maturity Year			2021
Debt Instrument, Maturity Date			Mar. 01, 2021
Convertible One Point Five Percent Senior Notes Due Twenty Nineteen [Member]
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure		74,486			216,195
Debt Instrument, Face Amount	$ 300,000	$ 99,647			300,000
Debt Instrument Maturity Year		2019
Debt Instrument, Maturity Date	Sep. 01, 2019
First-Lien Credit Facility Maturing Twenty Twenty Three [Member] [Domain]
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure		$ 162,505			0
Debt Instrument, Face Amount		$ 163,322			$ 0