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Acquisition - Summary of Attribution Principles (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Business Combination [Line Items]          
Noncontrolling interest in BKV-BPP Power $ 75,943   $ 75,943   $ 67,982 [1]
BKV’s interest in BKV-BPP Power 2,297,103   2,297,103   1,985,808 [1]
Less: net income (loss) attributable to noncontrolling interest 1,524 $ 4,707 [2] 9,293 $ (85) [2]  
Net income (loss) attributable to BKV 75,806 107,768 [2] 119,881 25,789 [2]  
BKV-BPP Power net income (loss) attributable to common shareholders $ 74,006 107,487 $ 117,340 25,508  
Net income attributable to common shareholders   $ 25,387   $ 6,404  
Net income per common share attributable to BKV:          
Basic (in USD per share)   1.22   0.31  
Diluted (in USD per share)   1.22   0.31  
Basic (in USD per share) $ 0.68 $ 1.27 [2] $ 1.11 $ 0.30 [2]  
Diluted (in USD per share) $ 0.67 $ 1.27 [2] $ 1.11 $ 0.30 [2]  
Weighted average number of common shares outstanding:          
Basic (in shares)   20,833,000   20,833,000  
Diluted (in shares)   20,864,000   20,853,000  
Banpu          
Business Combination [Line Items]          
Net Income (Loss) Available to Majority Stockholders   $ 82,381   $ 19,385  
Net income per common share attributable to BKV:          
Basic (in USD per share)   1.29   0.30  
Diluted (in USD per share)   1.29   0.30  
Weighted average number of common shares outstanding:          
Basic (in shares)   63,877,000   63,875,000  
Diluted (in shares)   63,970,000   63,936,000  
BKV-BPP Power          
Business Combination [Line Items]          
Less: net income (loss) attributable to noncontrolling interest   $ 4,544   $ (248)  
Net income (loss) attributable to BKV   13,632   (746)  
BKV-BPP Power net income (loss) attributable to common shareholders   2,235   (122)  
BKV-BPP Power | Banpu          
Business Combination [Line Items]          
Net Income (Loss) Available to Majority Stockholders   $ 10,279   $ (562)  
BKV-BPP Power, LLC          
Business Combination [Line Items]          
Noncontrolling interest in BKV-BPP Power         64,277
BKV’s interest in BKV-BPP Power         192,830
Net assets attributable to common shareholders         43,785
BKV-BPP Power, LLC | Banpu          
Business Combination [Line Items]          
Net assets attributable to Banpu         $ 127,153
[1] The financial information presented in this Quarterly Report on Form 10-Q has been retrospectively adjusted for the BKV-BPP Power Joint Venture Transaction, which was accounted for as a transaction between entities under common control, with prior periods recast as if the transaction had occurred at the beginning of the earliest period presented. See Note 2 - Acquisition for further information.
[2] The financial information presented in this Quarterly Report on Form 10-Q has been retrospectively adjusted for the BKV-BPP Power Joint Venture Transaction, which was accounted for as a transaction between entities under common control, with prior periods recast as if the transaction had occurred at the beginning of the earliest period presented. See Note 2 - Acquisition for further information.