Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Revenues	$ 0	$ 0
Operating expenses:
General and administrative expense	32,505	26,271
Development expense	2,509	464
Lease expense	3,019	337
Depreciation expense	84	38
Total operating expenses	38,117	27,110
Total operating loss	(38,117)	(27,110)
Other income (expense):
Loss on common stock warrant liabilities	(1,516)	(367)
Derivative gain	258,872	0
Interest expense, net of capitalized interest	(25,479)	0
Loss on debt extinguishment	(7,440)	0
Other, net	455	130
Total other income (expense)	224,892	(237)
Net income (loss) attributable to NextDecade Corporation	186,775	(27,347)
Less: net income attributable to non-controlling interest	158,429	0
Less: preferred stock dividends	0	(6,700)
Net income (loss) attributable to common stockholders	$ 28,346	$ (34,047)
Net loss per common share - basic (in usd per share)	$ 0.11	$ (0.23)
Net loss per common share - diluted (in usd per share)	$ 0.11	$ (0.23)
Weighted average shares outstanding - basic (in shares)	256,707	146,931
Weighted average shares outstanding - diluted (in shares)	266,886	146,931