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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Mar. 04, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-36842    
Entity Registrant Name NEXTDECADE CORPORATION    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 46-5723951    
Entity Address, Address Line One 1000 Louisiana Street, Suite 3900    
Entity Address, City or Town Houston    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 77002    
City Area Code 713    
Local Phone Number 574-1880    
Title of 12(b) Security Common stock $0.0001 par value    
Trading Symbol NEXT    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 376.4
Entity Common Stock, Shares Outstanding   256,708,470  
Documents Incorporated by Reference
Documents incorporated by reference: Portions of the definitive proxy statement for the registrant's Annual Meeting of Stockholders (to be filed within 120 days of the close of the registrant's fiscal year) are incorporated by reference into Part III of this Form 10-K.
    
Entity Central Index Key 0001612720    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2023    
Amendment Flag false