Variable Interest Entities (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2025	Dec. 31, 2024
Variable Interest Entity [Line Items]
Total assets	$ 753,530	$ 355,404
Total liabilities	509,701	351,483
SNS
Variable Interest Entity [Line Items]
Total assets	9,400	12,900
Total liabilities	$ 6,400	9,200
SNS
Variable Interest Entity [Line Items]
Variable interest entity, ownership percentage	90.00%
Variable interest entity, profits interest, percent	47.00%
IX LLC JV
Variable Interest Entity [Line Items]
Variable interest entity, ownership percentage	51.00%
LLC & KBR
Variable Interest Entity [Line Items]
Variable interest entity, ownership percentage	10.00%
KBR, Inc.
Variable Interest Entity [Line Items]
Variable interest entity, profits interest, percent	53.00%
IX LLC JV
Variable Interest Entity [Line Items]
Total assets	$ 0	$ 500
X-energy \| IX LLC JV
Variable Interest Entity [Line Items]
Variable interest entity, ownership percentage	49.00%

Variable Interest Entity, Profits Interest, Percent

No definition available.

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- Definition

Amount of asset recognized for present right to economic benefit.

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