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Equity Method Investment, Deferred Performance Incentives, Amount Recognized

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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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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 which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Equity (Details) - USD ($) $ in Millions			1 Months Ended			3 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	Mar. 31, 2019	Mar. 31, 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						$ 16.8
Ownership percentage						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
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of shares					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						$ 4.0
San Mateo II \| Matador Resources Company \| Corporate Joint Venture
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contributions to related party						$ 1.0
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%
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value			$ 9.2
Subsequent Event \| 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
Subsequent Event \| 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