Ownership amount of cash distributions declared to unit-holders of a limited partnership (LP).

No definition available.

Name:	am_DisributionsInExcessOfEarnings
Namespace Prefix:	am_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of equity impact of cash distribution declared to unit-holder of partnership.

+ References

No definition available.

+ Details

Name:	am_DistributionMadeToPartnerCashDistributionsDeclared
Namespace Prefix:	am_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Net income subsequent to IPO per limited partner unit

+ References

No definition available.

+ Details

Name:	am_IncomeSubsequentToIpoPerLimitedPartnerUnitNet
Namespace Prefix:	am_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents minimum quarterly distribution as per partnership agreement.

+ References

No definition available.

+ Details

Name:	am_LimitedPartnerMinimumQuarterlyDistributionPerPartnershipAgreement
Namespace Prefix:	am_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	duration

- Definition

Per unit of ownership amount after tax of income (loss) available to outstanding limited partnership (LP) common unit-holder.

+ References

No definition available.

+ Details

Name:	am_NetIncomeLossPerOutstandingLimitedPartnershipCommonUnitBasicNetOfTax
Namespace Prefix:	am_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Per unit of ownership amount after tax of income (loss) available to limited partnership (LP) common unit-holder and units that would have been outstanding assuming the issuance of limited partner units for dilutive potential units outstanding.

+ References

No definition available.

+ Details

Name:	am_NetIncomeLossPerOutstandingLimitedPartnershipCommonUnitDilutedNetOfTax
Namespace Prefix:	am_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Per unit of ownership amount after tax of income (loss) available to outstanding limited partnership (LP) subordinated unit-holder.

+ References

No definition available.

+ Details

Name:	am_NetIncomeLossPerOutstandingLimitedPartnershipSubordinatedUnitBasicNetOfTax
Namespace Prefix:	am_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Per unit of ownership amount after tax of income (loss) available to limited partnership (LP) subordinated unit-holder and units that would have been outstanding assuming the issuance of limited partner units for dilutive potential units outstanding.

+ References

No definition available.

+ Details

Name:	am_NetIncomeLossPerOutstandingLimitedPartnershipSubordinatedUnitDilutedNetOfTax
Namespace Prefix:	am_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average number of limited partnership common units outstanding determined by relating the portion of time within a reporting period that limited partnership common units have been outstanding to the total time in that period.

+ References

No definition available.

+ Details

Name:	am_WeightedAverageLimitedPartnershipCommonUnitsOutstandingBasic
Namespace Prefix:	am_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

+ References

No definition available.

+ Details

Name:	am_WeightedAverageLimitedPartnershipCommonUnitsOutstandingDiluted
Namespace Prefix:	am_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average number of limited partnership subordinated units outstanding determined by relating the portion of time within a reporting period that limited partnership subordinated units have been outstanding to the total time in that period. Used in the calculation of diluted net income or loss per limited partnership subordinated unit.

+ References

No definition available.

+ Details

Name:	am_WeightedAverageLimitedPartnershipSubordinatedUnitsOutstandingDiluted
Namespace Prefix:	am_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average number of limited partnership units outstanding.

+ References

No definition available.

+ Details

Name:	am_WeightedAverageLimitedPartnershipUnitsOutstandingAbstract
Namespace Prefix:	am_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

+ References

No definition available.

+ Details

Name:	am_WeightedAverageLimitedPartnershipUnitsOutstandingBasic
Namespace Prefix:	am_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Antidilution

-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Diluted Earnings Per Share

-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Contingent Stock Agreement

-URI http://asc.fasb.org/extlink&oid=6508534

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

+ Details

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of equity impact of cash distribution declared to unit-holder of limited partnership (LP).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 272

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 272

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

Name:	us-gaap_DistributionMadeToLimitedPartnerCashDistributionsDeclared
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Per unit of ownership amount of cash distributions declared to unit-holder of a limited partnership (LP).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 272

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 272

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

Name:	us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

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

- Definition

The portion of profit or loss for the period which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.20)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

Name:	us-gaap_IncomeLossAttributableToParent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Weighted average number of limited partnership units outstanding determined by relating the portion of time within a reporting period that limited partnership units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 4

-Section F

+ Details

Name:	us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

+ References

+ Details

Name:	us-gaap_WeightedAverageLimitedPartnershipUnitsOutstandingDiluted
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=am_RestrictedAndPhantomUnitAwardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PartnerTypeOfPartnersCapitalAccountAxis=us-gaap_LimitedPartnerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PartnerCapitalComponentsAxis=am_CommonUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PartnerCapitalComponentsAxis=am_SubordinatedUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Net Income Per Limited Partner Unit (Details) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($) $ / shares $ / item shares	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) $ / shares shares	Jun. 30, 2014 USD ($)
Earnings Per Unit [Abstract]
Distribution declared \| $	$ 28,858		$ 56,196
Distributions in excess of earnings \| $	(9,408)		(21,098)
Net income (loss) and comprehensive income (loss) \| $	$ 19,450	$ (735)	$ 35,098	$ 39
Weighted average units outstanding:
Common units - basic	75,940,957		75,940,957
Subordinated units - basic	75,940,957		75,940,957
Weighted average units outstanding - basic	151,882,000		151,882,000
Common units diluted	75,957,984		75,956,354
Subordinated units - diluted	75,940,957		75,940,957
Weighted average units outstanding - diluted	151,899,000		151,897,000
Net income attributable to Antero Midstream Partners LP subsequent to IPO per limited unit partner unit
Common units - basic \| $ / shares	$ 0.13		$ 0.23
Subordinated units - basic \| $ / shares	0.13		0.23
Common units - diluted \| $ / shares	0.13		0.23
Subordinated units - diluted \| $ / shares	0.13		$ 0.23
Cash distribution declared \| $ / shares	$ 0.19
Minimum
Net income attributable to Antero Midstream Partners LP subsequent to IPO per limited unit partner unit
Limited partner minimum quarterly distribution per partnership agreement \| $ / item	0.17
Minimum quarterly cash distribution (per unit) \| $ / item	0.17
Restricted and phantom unit award
Weighted average units outstanding:
Weighted average units outstanding - diluted	17,027		15,397
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	2,319,412		2,316,264
Limited Partner (Common units)
Earnings Per Unit [Abstract]
Distribution declared \| $	$ 14,429		$ 28,098
Distributions in excess of earnings \| $	(4,704)		(10,549)
Net income (loss) and comprehensive income (loss) \| $	$ 9,725		$ 17,549
Weighted average units outstanding:
Common units - basic	75,941,000		75,941,000
Common units diluted	75,958,000		75,956,000
Net income attributable to Antero Midstream Partners LP subsequent to IPO per limited unit partner unit
Common units - basic \| $ / shares	$ 0.13		$ 0.23
Common units - diluted \| $ / shares	$ 0.13		$ 0.23
Common units
Weighted average units outstanding:
Weighted average units outstanding - diluted	75,957,984		75,956,354
Common units \| Limited Partner (Common units)
Net income attributable to Antero Midstream Partners LP subsequent to IPO per limited unit partner unit
Cash distribution declared \| $ / shares	$ 0.19		$ 0.37
Quarterly cash distribution \| $	$ 14,429		$ 28,098
Limited Partner (Subordinated units)
Earnings Per Unit [Abstract]
Distribution declared \| $	14,429		28,098
Distributions in excess of earnings \| $	(4,704)		(10,549)
Net income (loss) and comprehensive income (loss) \| $	$ 9,725		$ 17,549
Weighted average units outstanding:
Subordinated units - basic	75,941,000		75,941,000
Subordinated units - diluted	75,941,000		75,941,000
Net income attributable to Antero Midstream Partners LP subsequent to IPO per limited unit partner unit
Subordinated units - basic \| $ / shares	$ 0.13		$ 0.23
Subordinated units - diluted \| $ / shares	0.13		0.23
Limited Partner (Subordinated units) \| Limited Partner (Common units)
Net income attributable to Antero Midstream Partners LP subsequent to IPO per limited unit partner unit
Cash distribution declared \| $ / shares	$ 0.19		$ 0.37
Quarterly cash distribution \| $	$ 14,429		$ 28,098