Cover Page - shares	3 Months Ended
	Mar. 31, 2024	May 03, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
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 3300
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		257,994,156
Entity Central Index Key	0001612720
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2024
Amendment Flag	false