LONG-TERM DEBT - Narrative (Details) - USD ($)		3 Months Ended		12 Months Ended
LONG-TERM DEBT - Narrative (Details) - USD ($)	Oct. 30, 2025	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	May 31, 2025	Sep. 30, 2024
Debt Instrument [Line Items]
Interest costs capitalized		$ 1,400,000	$ 1,400,000
Net unamortized debt issuance costs		$ 823,717,000			$ 788,187,000
6.75% senior unsecured notes due 2029 \| Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount							$ 650,000,000.0
Stated interest rate		6.75%					6.75%
Long-term debt		$ 650,000,000			$ 650,000,000
Net unamortized debt issuance costs		641,700,000
6.75% senior unsecured notes due 2029 \| Senior Notes \| Level 1
Debt Instrument [Line Items]
Carrying value of notes		$ 665,300,000
8.00% Senior Unsecured Notes Due 2026 \| Senior Notes
Debt Instrument [Line Items]
Debt instrument, repurchase amount						$ 25,700,000	$ 524,300,000
Loss on debt extinguishment				$ 13,400,000
Credit Facility due 2028 \| Revolving Credit Facility
Debt Instrument [Line Items]
Initial borrowing base amount	$ 1,100,000,000
Line of credit facility, commitment fee amount	$ 1,000,000,000.0
Debt instrument net funded leverage ratio		350.00%
Debt instrument current ratio		100.00%
Long-term debt		$ 182,000,000.0
Letters of credit outstanding, amount		$ 48,700,000
Weight average interest rate		6.30%	6.79%
Credit Facility due 2028 \| Revolving Credit Facility \| Minimum
Debt Instrument [Line Items]
Unused capacity, commitment fee percentage		0.375%
Credit Facility due 2028 \| Revolving Credit Facility \| Minimum \| SOFR
Debt Instrument [Line Items]
Variable interest rate		2.25%
Credit Facility due 2028 \| Revolving Credit Facility \| Minimum \| Base Rate
Debt Instrument [Line Items]
Variable interest rate		1.25%
Credit Facility due 2028 \| Revolving Credit Facility \| Maximum
Debt Instrument [Line Items]
Unused capacity, commitment fee percentage		0.50%
Credit Facility due 2028 \| Revolving Credit Facility \| Maximum \| SOFR
Debt Instrument [Line Items]
Variable interest rate		3.25%
Credit Facility due 2028 \| Revolving Credit Facility \| Maximum \| Base Rate
Debt Instrument [Line Items]
Variable interest rate		2.25%

GULFPORT ENERGY CORP 10-Q