XML 65 R51.htm IDEA: XBRL DOCUMENT
v3.20.2

VARIABLE INTEREST ENTITIES - All Dale III (Detail) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Feb. 28, 2017
All Dale Minerals III |  |
Equity Investments |  |
Distribution after hurdles (as a percent) | 25.00% |
Specified internal rate of return (as a percent) | 10.00% |
Percentage of available cash distributed | 125.00% |
All Dale Minerals III |  |
Equity Investments |  |
Other Commitment |  | $ 30.0
All Dale Minerals III | All Dale Minerals III |  |
Equity Investments |  |
Ownership percentage by limited partners | 13.90% |

X
- Definition The specified internal rate of return to determine distribution percentage, as a percent. + References No definition available. + Details
Name: | arlp_DistributionsMadeToMemberOrLimitedPartnerInternalRateOfReturn
Namespace Prefix: | arlp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of available cash distributed to members or limited partners of an LLC or LP. + References No definition available. + Details
Name: | arlp_DistributionsMadeToMemberOrLimitedPartnerPercentageOfAvailableCash
Namespace Prefix: | arlp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The distribution percentage after the hurdles are reached. + References No definition available. + Details
Name: | arlp_DistributionsPercentageAfterHurdlesAreReached
Namespace Prefix: | arlp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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_InvestmentsInAndAdvancesToAffiliatesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
Name: | us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | srt_OwnershipAxis=arlp_AllDaleMineralsIiiMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=arlp_AllDaleMineralsIiiMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |