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, 2022			43,743,907
Beginning balances at Dec. 31, 2022		$ 985,145	$ 437	$ 470,407	$ 788	$ 481,384	$ 953,016	$ 32,129
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss		(25,772)				(23,023)	(23,023)	(2,749)
Other comprehensive income (loss)		(135)			(135)		(135)
Repurchases of common stock (shares)	[1]		(87,260)
Repurchases of common stock	[1]	(3,523)		(3,523)			(3,523)
RSUs vested (shares)			223,967
RSUs vested		0	$ 2	(2)
Dividends on common stock		(5,704)		74		(5,778)	(5,704)
Transactions with non-controlling interests		17,574						17,574
Stock-based compensation expense and other (in shares)			(390)
Stock-based compensation expense and other		4,826		4,826			4,826
Ending balances (in shares) at Mar. 31, 2023			43,880,224
Ending balances at Mar. 31, 2023		$ 972,411	$ 439	471,782	653	452,583	925,457	46,954
Beginning balances (in shares) at Dec. 31, 2023		43,944,118	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 loss		(29,442)				(30,983)	(30,983)	1,541
Other comprehensive income (loss)		409			409		409
Repurchases of common stock (shares)	[1]		(135,434)
Repurchases of common stock	[1]	(7,416)	$ (1)	(7,415)			(7,416)
RSUs vested (shares)			341,394
RSUs vested		0	$ 3	(3)
Dividends on common stock		(5,741)		72		(5,813)	(5,741)
Transactions with non-controlling interests		6,938						6,938
Stock-based compensation expense and other (in shares)			(434)
Stock-based compensation expense and other		$ 12,891		12,891			12,891
Ending balances (in shares) at Mar. 31, 2024		44,149,644	44,149,644
Ending balances at Mar. 31, 2024		$ 1,004,605	$ 441	$ 479,679	$ 1,290	$ 465,048	$ 946,458	$ 58,147

[1] Represents shares withheld related to employee taxes for RSUs vested under our equity incentive plans.