Variable Interest Entities - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Total assets	$ 85,908	$ 67,004
Total liabilities	$ 139,327	$ 124,623
IX, LLC
Variable Interest Entity [Line Items]
Variable interest entity, ownership percentage	51.00%
SNS
Variable Interest Entity [Line Items]
Variable interest entity, ownership percentage	90.00%
Variable interest entity, profits interest, percent	47.00%
X-energy \| IX, LLC
Variable Interest Entity [Line Items]
Variable interest entity, ownership percentage	49.00%
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%

Variable Interest Entity, Profits Interest, Percent

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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