v3.26.1
Cover - shares
 3 Months Ended
Mar. 31, 2026
May 08, 2026
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Entity Central Index Key 0002065636  
Document Period End Date Mar. 31, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Document Transition Report false  
Current Fiscal Year End Date --12-31  
Entity File Number 001-43117  
Entity Registrant Name SOLV Energy, Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 33-4537250  
Entity Address, Address Line One 16680  
Entity Address, Address Line Two West Bernardo Drive  
Entity Address, City or Town San Diego  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 92127  
City Area Code 858  
Local Phone Number 251-4888  
Title of 12(b) Security Class A Common Stock, par value $0.0001 per share  
Trading Symbol MWH  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Common Class A [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   115,348,571
Common Class B [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   87,046,962