Employee Retirement Plans	12 Months Ended
Dec. 31, 2025
Postemployment Benefits [Abstract]
Employee Retirement Plans	14. Employee Retirement Plans 401(k) Plans The Company and various subsidiaries maintain 401(k) retirement savings plans which cover eligible employees, including for certain union steelworkers, and permit participants to contribute to the plans, subject to Internal Revenue Code restrictions and which feature matching contributions of various percentages of the first 3% to 5% of employee annual salary contributions, depending on the subsidiary. The Company made aggregate matching contributions of $2.9 million for the year ended December 31, 2025, of which $1.3 million was reflected as a component of Cost of revenue in the Consolidated Statements of Operations, and $1.6 million was reflected as a component of Selling, general and administrative in the Consolidated Statements of Operations. The Company made aggregate matching contributions of $2.8 million for the year ended December 31, 2024, of which $1.1 million was reflected as a component of Cost of revenue in the Consolidated Statements of Operations, and $1.7 million was reflected as a component of Selling, general and administrative in the Consolidated Statements of Operations. Multi-Employer Plans Certain of the Company's Infrastructure segment workforce are subject to collective bargaining agreements. The Company contributes to union-sponsored, multi-employer pension plans. Contributions are made in accordance with negotiated labor contracts. The passage of the Multi-Employer Pension Plan Amendments Act of 1980 ("the Act") may, under certain circumstances, cause the Company to become subject to liabilities in excess of contributions made under collective bargaining agreements. Generally, liabilities are contingent upon termination, withdrawal, or partial withdrawal from the plans. Under the Act, liabilities would be based upon the Company's proportionate share of each plan's unfunded vested benefits. The Company made contributions to various multi-employer pension plans totaling $6.5 million and $9.8 million during the years ended December 31, 2025 and 2024, respectively, which was reflected as a component of Cost of revenue in the Consolidated Statements of Operations. Amounts contributed to the multi-employer pension plans can vary depending on a combination of when and in which state the erection phase of the Company's projects occur. The decrease in contributions for the year ended December 31, 2025 was due to the timing of work being done on the erection phase of our projects in states with higher contribution rates such as California and New York. As of December 31, 2025, approximately 23.9% of DBMG’s employees are covered under various collective bargaining agreements. As of December 31, 2025, most of the Infrastructure segment's collective bargaining agreements are subject to automatic annual or other renewal unless either party elects to terminate the agreement on the scheduled expiration date.

The Company and various subsidiaries maintain 401(k) retirement savings plans which cover eligible employees, including for certain union steelworkers, and permit participants to contribute to the plans, subject to Internal Revenue Code restrictions and which feature matching contributions of various percentages of the first 3% to 5% of employee annual salary contributions, depending on the subsidiary. The Company made aggregate matching contributions of $2.9 million for the year ended December 31, 2025, of which $1.3 million was reflected as a component of Cost of revenue in the Consolidated Statements of Operations, and $1.6 million was reflected as a component of Selling, general and administrative in the Consolidated Statements of Operations. The Company made aggregate matching contributions of $2.8 million for the year ended December 31, 2024, of which $1.1 million was reflected as a component of Cost of revenue in the Consolidated Statements of Operations, and $1.7 million was reflected as a component of Selling, general and administrative in the Consolidated Statements of Operations.

Certain of the Company's Infrastructure segment workforce are subject to collective bargaining agreements. The Company contributes to union-sponsored, multi-employer pension plans. Contributions are made in accordance with negotiated labor contracts. The passage of the Multi-Employer Pension Plan Amendments Act of 1980 ("the Act") may, under certain circumstances, cause the Company to become subject to liabilities in excess of contributions made under collective bargaining agreements. Generally, liabilities are contingent upon termination, withdrawal, or partial withdrawal from the plans. Under the Act, liabilities would be based upon the Company's proportionate share of each plan's unfunded vested benefits.

The Company made contributions to various multi-employer pension plans totaling $6.5 million and $9.8 million during the years ended December 31, 2025 and 2024, respectively, which was reflected as a component of Cost of revenue in the Consolidated Statements of Operations. Amounts contributed to the multi-employer pension plans can vary depending on a combination of when and in which state the erection phase of the Company's projects occur. The decrease in contributions for the year ended December 31, 2025 was due to the timing of work being done on the erection phase of our projects in states with higher contribution rates such as California and New York. As of December 31, 2025, approximately 23.9% of DBMG’s employees are covered under various collective bargaining agreements. As of December 31, 2025, most of the Infrastructure segment's collective bargaining agreements are subject to automatic annual or other renewal unless either party elects to terminate the agreement on the scheduled expiration date.