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Condensed Consolidated Statements of Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Total Granite Shareholders’ Equity
Non-controlling Interests
Beginning balances (in shares) at Dec. 31, 2023   43,944,118          
Beginning balances at Dec. 31, 2023 $ 1,026,966 $ 439 $ 474,134 $ 881 $ 501,844 $ 977,298 $ 49,668
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 93,392       84,863 84,863 8,529
Other comprehensive income (loss) (444)     (444)   (444)  
Repurchases of common stock (shares) [1]   (370,113)          
Repurchases of common stock [1] (21,385) $ (3) (20,877)   (505) (21,385)  
RSUs vested (shares)   375,704          
RSUs vested 0 $ 4 (4)        
Dividends on common stock (17,100)   225   (17,325) (17,100)  
Capped call transactions (34,189)   (34,189)     (34,189)  
Redemption of warrants 466   466     466  
Common stock issued in debt redemption (in shares)   11,665          
Common stock issued in debt redemption 0            
Exercise of bond hedge (in shares)   (260,883)          
Common stock issued in debt redemption 0 $ (3) 3        
Transactions with non-controlling interests 4,388           4,388
Stock-based compensation expense and other (in shares)   4,350          
Stock-based compensation expense and other 17,585   17,585     17,585  
Ending balances (in shares) at Sep. 30, 2024   43,704,841          
Ending balances at Sep. 30, 2024 $ 1,069,679 $ 437 437,343 437 568,877 1,007,094 62,585
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Dividends on common stock (USD per share) $ 0.13            
Beginning balances (in shares) at Jun. 30, 2024   43,686,508          
Beginning balances at Jun. 30, 2024 $ 987,415 $ 437 435,271 270 495,679 931,657 55,758
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 83,977       78,951 78,951 5,026
Other comprehensive income (loss) 167     167   167  
Repurchases of common stock (shares) [2]   (3,546)          
Repurchases of common stock [2] (241)   (241)     (241)  
RSUs vested (shares)   10,264          
RSUs vested 0            
Dividends on common stock (5,680)   73   (5,753) (5,680)  
Exercise of bond hedge (in shares)   11,665          
Common stock issued in debt redemption 0            
Transactions with non-controlling interests 1,801           1,801
Stock-based compensation expense and other (in shares)   (50)          
Stock-based compensation expense and other 2,240   2,240     2,240  
Ending balances (in shares) at Sep. 30, 2024   43,704,841          
Ending balances at Sep. 30, 2024 $ 1,069,679 $ 437 437,343 437 568,877 1,007,094 62,585
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Dividends on common stock (USD per share) $ 0.13            
Beginning balances (in shares) at Dec. 31, 2024 43,424,646 43,424,646          
Beginning balances at Dec. 31, 2024 $ 1,079,363 $ 434 410,739 (582) 604,635 1,015,226 64,137
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 161,415       140,973 140,973 20,442
Other comprehensive income (loss) 1,450     1,450   1,450  
Repurchases of common stock (shares) [1]   (257,540)          
Repurchases of common stock [1] (21,600) $ (3) (21,597)     (21,600)  
RSUs vested (shares)   565,208          
RSUs vested 0 $ 6 (6)        
Dividends on common stock (17,067)   209   (17,276) (17,067)  
Transactions with non-controlling interests (35,378)           (35,378)
Stock-based compensation expense and other (in shares)   4,451          
Stock-based compensation expense and other $ 36,798   36,798     36,798  
Ending balances (in shares) at Sep. 30, 2025 43,736,765 43,736,765          
Ending balances at Sep. 30, 2025 $ 1,204,981 $ 437 426,143 868 728,332 1,155,780 49,201
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Dividends on common stock (USD per share) $ 0.13            
Beginning balances (in shares) at Jun. 30, 2025   43,778,784          
Beginning balances at Jun. 30, 2025 $ 1,114,355 $ 438 430,155 997 631,158 1,062,748 51,607
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 109,397       102,929 102,929 6,468
Other comprehensive income (loss) (129)     (129)   (129)  
Repurchases of common stock (shares) [2]   (56,802)          
Repurchases of common stock [2] (6,282) $ (1) (6,281)     (6,282)  
RSUs vested (shares)   14,848          
RSUs vested 0            
Dividends on common stock (5,688)   67   (5,755) (5,688)  
Transactions with non-controlling interests (8,874)           (8,874)
Stock-based compensation expense and other (in shares)   (65)          
Stock-based compensation expense and other $ 2,202   2,202     2,202  
Ending balances (in shares) at Sep. 30, 2025 43,736,765 43,736,765          
Ending balances at Sep. 30, 2025 $ 1,204,981 $ 437 $ 426,143 $ 868 $ 728,332 $ 1,155,780 $ 49,201
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Dividends on common stock (USD per share) $ 0.13            
[1] Represents shares withheld related to employee taxes for RSUs vested under our equity incentive plans in 2025 and 2024, as well as 51,320 and 225,000 shares repurchased under our share repurchase program in 2025 and 2024, respectively.
[2] Represents shares withheld related to employee taxes for RSUs vested under our equity incentive plans in 2025 and 2024, as well as 51,120 shares repurchased under our share repurchase program in 2025.