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Document And Entity Information - USD ($)
12 Months Ended
Dec. 31, 2021
Feb. 18, 2022
Jun. 30, 2021
Document Information [Line Items]      
Entity Central Index Key 0000861459    
Entity Registrant Name GRANITE CONSTRUCTION INC    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2021    
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Document Transition Report false    
Entity File Number 1-12911    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 77-0239383    
Entity Address, Address Line One 585 West Beach Street    
Entity Address, City or Town Watsonville    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 95076    
City Area Code 831    
Local Phone Number 724-1011    
Title of 12(b) Security Common stock, $0.01 par value    
Trading Symbol GVA    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 1,900,000,000
Entity Common Stock, Shares Outstanding   45,875,355  
Auditor Name PricewaterhouseCoopers LLP    
Auditor Location Houston, Texas    
Auditor Firm ID 238    
ICFR Auditor Attestation Flag true