Equity and Noncontrolling Interest - Additional Information (Details)
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3 Months Ended |
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Feb. 18, 2026
USD ($)
$ / shares
shares
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Aug. 31, 2025 |
Mar. 31, 2026
USD ($)
$ / shares
shares
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Dec. 31, 2025
USD ($)
$ / shares
shares
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Feb. 28, 2026
$ / shares
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| Class of Stock [Line Items] |
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| Preferred stock, shares authorized |
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10,000,000
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10,000,000
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| Preferred stock, par value | $ / shares |
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$ 0.0001
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$ 0.0001
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| Preferred stock, shares issued |
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0
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0
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| Preferred stock, shares outstanding |
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0
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0
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| Description of redemption |
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Cardinal’s ("OpCo's") amended and restated operating agreement provides that the Continuing Equity Holders have the right (the “Redemption Right”) to cause OpCo to redeem all or a portion of their Class B LLC units, together with a corresponding number of shares of Class B Common Stock, for newly issued shares of Cardinal Infrastructure Group Inc.'s Class A Common Stock on a one-for-one basis (subject to customary adjustments for stock splits, stock dividends, and reclassifications). Alternatively, Cardinal Infrastructure Group Inc. may, at its option (the “Call Right”), elect to directly acquire the tendered LLC units and Class B Common Stock from the Continuing Equity Holder in exchange for Class A Common Stock on the same one-for-one basis.
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| Gain or loss on exchange of equity transaction | $ |
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$ 0
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| Gain or loss recognized | $ |
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$ 0
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| OpCo |
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| Class of Stock [Line Items] |
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| Percentage of voting rights |
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100.00%
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| OpCo | AL Grading Contractors LLC |
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| Class of Stock [Line Items] |
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| Common unit, issued |
4,186,062
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| OpCo | AL Grading Contractors LLC | 2025 Plan |
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| Class of Stock [Line Items] |
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| Business combination, equity interest, share issued |
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345,666
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| Cardinal NC | Aviator Paving Company LLC |
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| Class of Stock [Line Items] |
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| Ownership interests in subsidiary |
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60.00%
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| Cardinal NC | Cardinal Civil Contracting NC LLC |
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| Class of Stock [Line Items] |
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| Ownership interests in subsidiary |
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70.00%
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| Cardinal NC | Civil Drilling & Blasting, LLC |
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| Class of Stock [Line Items] |
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| Ownership interests in subsidiary |
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90.00%
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| Cardinal NC | Cardinal Civil Contracting Charlotte, LLC |
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| Class of Stock [Line Items] |
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| Ownership interests in subsidiary |
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75.00%
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| Cardinal NC | Cardinal Civil Contracting Triad, LLC |
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| Class of Stock [Line Items] |
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| Ownership interests in subsidiary |
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80.00%
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| Cardinal NC | Civil Underground and Boring Company, LLC |
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| Class of Stock [Line Items] |
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| Ownership interests in subsidiary |
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70.00%
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| Class A Common Stock |
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| Class of Stock [Line Items] |
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| Common stock, shares authorized |
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500,000,000
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500,000,000
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| Common stock, par value per share | $ / shares |
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$ 0.0001
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$ 0.0001
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| Common stock voting rights |
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Each share of Class A Common Stock entitles its holder to one vote per share on all matters presented to Cardinal Infrastructure Group Inc.’s stockholders.
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| Common stock, shares issued |
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15,292,984
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14,947,318
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| Common stock, shares outstanding |
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15,292,984
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14,947,318
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| Class A Common Stock | AL Grading Contractors LLC | 2025 Plan |
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| Class of Stock [Line Items] |
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| Common stock, par value per share | $ / shares |
$ 0.0001
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| Closing share price | $ / shares |
$ 24.56
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| Business combination, equity interest, share issued |
345,666
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| Class A Common Stock | OpCo | AL Grading Contractors LLC |
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| Class of Stock [Line Items] |
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| Closing share price | $ / shares |
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$ 24.56
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| Consideration transferred in business combination | $ |
$ 102,809,683
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| Class A Common Stock | OpCo | Continuing Equity Holders |
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| Class of Stock [Line Items] |
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| Stock split ratio |
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1
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| Class A Common Stock | OpCo | Cardinal Infrastructure Group Inc. |
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| Class of Stock [Line Items] |
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| Stock split ratio |
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1
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| Class B Common Stock |
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| Class of Stock [Line Items] |
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| Common stock, shares authorized |
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500,000,000
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500,000,000
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| Common stock, par value per share | $ / shares |
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$ 0.0001
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$ 0.0001
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| Common stock voting rights |
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Each share of Class B Common Stock entitles its holder to one vote per share on all matters presented to Cardinal Infrastructure Group Inc.’s stockholders.
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| Common stock, shares issued |
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27,573,875
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23,387,813
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| Common stock, shares outstanding |
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27,573,875
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23,387,813
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| Class B Common Stock | OpCo | AL Grading Contractors LLC |
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| Class of Stock [Line Items] |
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| Common stock, par value per share | $ / shares |
$ 0.0001
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