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Equity Method Investment, Deferred Performance Incentives, Amount Recognized

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Equity Method Investment, Deferred Performance Incentives, Term

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Share Based Compensation Arrangement By Share Based Payment Award Options and Restricted Stock Grants In Period Fair Value

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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Carrying amount as of the balance sheet date of obligations due all related parties.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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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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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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Equity (Details) - USD ($) $ in Millions			1 Months Ended			3 Months Ended		9 Months Ended		12 Months Ended
Equity (Details) - USD ($) $ in Millions	Feb. 25, 2019	Feb. 15, 2017	Apr. 30, 2019	Feb. 28, 2019	Feb. 26, 2019	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period (in shares)		428,006
Fair value			$ 9.2					$ 16.8
Ownership percentage						100.00%		100.00%
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted in period (in shares)		428,006
Performance-Based Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of shares					3 years
Service-Based Restricted Stock Units To Be Settled In Cash
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted in period (in shares)			259,038
Service-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period (in shares)			205,361
Vesting period of shares			3 years		3 years
Corporate Joint Venture \| San Mateo
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred performance incentives								$ 44.1		$ 73.5
Deferred performance incentives term								3 years		5 years
Performance incentives earned								$ 14.7	$ 14.7
Corporate Joint Venture \| San Mateo II
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Due to related party	$ 125.0
Capital expenditures incurred	150.0
Deferred performance incentives	$ 150.0
Deferred performance incentives term								5 years
Five Point \| San Mateo II \| Corporate Joint Venture
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ownership percentage	49.00%
Matador Resources Company \| San Mateo II \| Corporate Joint Venture
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ownership percentage	51.00%
San Mateo II \| Five Point \| Corporate Joint Venture
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contributions to related party						$ 22.5		$ 34.0
San Mateo II \| Matador Resources Company \| Corporate Joint Venture
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contributions to related party						$ 4.5		$ 6.0
Minimum \| Performance-Based Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				0.00%
Maximum \| Performance-Based Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				200.00%
Property Contribution \| San Mateo II \| Matador Resources Company \| Corporate Joint Venture
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contributions to related party							$ 1.0