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Variable Interest Entities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Variable Interest Entity [Line Items]
Total assets	$ 170,771	$ 85,908
Total liabilities	214,708	139,327
SNS
Variable Interest Entity [Line Items]
Total assets	35,600	13,700
Total liabilities	$ 32,300	$ 12,000
IX LLC JV
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 JV
Variable Interest Entity [Line Items]
Variable interest entity, ownership percentage	49.00%
IX LLC JV
Variable Interest Entity [Line Items]
Total assets	$ 0
Total liabilities	$ 0
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%

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