Number of days the value of common units divided by volume weighted average closing price.

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Number of non-employee directors to whom Phantom Units are granted.

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Percentage of payout value for both performance conditions interpolated on linear basis.

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Percentage of performance-based awards for leverage.

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Percentage of performance-based awards weighted for increase of funds flow from operations.

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Share based compensation arrangement by share based payment award remaining vesting rights percentage based upon employee's death, disability or retirement.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Description of service or performance condition required to be met for earning right to award under share-based payment arrangement. Includes, but is not limited to, combination of market, performance or service condition.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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.

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Percentage of vesting of award under share-based payment arrangement.

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Value, after forfeiture, of shares granted under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).

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Equity-Based Compensation - Additional Information (Details) $ in Millions	1 Months Ended			3 Months Ended			9 Months Ended		12 Months Ended
	Oct. 31, 2021 USD ($) shares	Jul. 31, 2021 NonEmployeeDirector shares	Feb. 28, 2021 NonEmployeeDirector shares	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($) shares	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2021	Dec. 31, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based employee and directors compensation expense \| $				$ 0.3		$ 0.3	$ 1.1	$ 1.1
Liability for equity-based awards \| $				$ 0.9			$ 0.9			$ 0.9
Phantom Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Phantom units granted \| shares		3,252	1,509
Number of non-employee directors to whom Phantom Units are granted. \| NonEmployeeDirector		5	3
Phantom units vested \| shares		16,833
Phantom Units [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Phantom units granted \| shares	33,045
Vesting rights description	50% vest ratably over three years through December 31, 2024 and 50% vest upon the employee’s death, disability or retirement.
Vesting percentage	50.00%
Remaining vesting rights percentage based upon employee's death, disability or retirement	50.00%
Vesting period	3 years
Phantom Units and Performance-based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Phantom units and performance-based awards units forfeited \| shares					6,090
Phantom units and performance-based awards with an initial target value \| $					$ 0.1
Performance Based Awards [Member] \| Scenario Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of performance-based awards are weighted for increase of funds flow from operations per unit									65.00%
Percentage Of Performance Based Awards For Leverage									35.00%
Performance Based Awards [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Phantom units and performance-based awards with an initial target value \| $	$ 0.8
Number of days the value of common units divided by volume weighted average closing price	20 days
Performance Based Awards [Member] \| Subsequent Event [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of payout value for both performance conditions interpolated on linear basis	0.00%
Performance Based Awards [Member] \| Subsequent Event [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of payout value for both performance conditions interpolated on linear basis	200.00%