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	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjustment Additional Paid-In Capital	Cumulative Effect, Period of Adoption, Adjustment Retained Earnings	Cumulative Effect, Period of Adoption, Adjustment Total Granite Shareholders’ Equity	Cumulative Effect, Period of Adoption, Adjusted Balance	Cumulative Effect, Period of Adoption, Adjusted Balance Common Stock	Cumulative Effect, Period of Adoption, Adjusted Balance Additional Paid-In Capital	Cumulative Effect, Period of Adoption, Adjusted Balance Accumulated Other Comprehensive Income (Loss)	Cumulative Effect, Period of Adoption, Adjusted Balance Retained Earnings	Cumulative Effect, Period of Adoption, Adjusted Balance Total Granite Shareholders’ Equity	Cumulative Effect, Period of Adoption, Adjusted Balance Non-controlling Interests
Beginning balances (in shares) at Dec. 31, 2021			45,840,260												45,840,260
Beginning balances at Dec. 31, 2021		$ 995,563	$ 458		$ 559,752	$ (3,359)	$ 410,831	$ 967,682	$ 27,881	$ (16,418)	$ (26,961)	$ 10,543	$ (16,418)	$ 979,145	$ 458	$ 532,791	$ (3,359)	$ 421,374	$ 951,264	$ 27,881
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		59,681					61,250	61,250	(1,569)
Other comprehensive income (loss)		$ 3,894				3,894		3,894
Repurchases of common stock (shares)		(2,298,353)	(2,370,376)	[1]
Repurchase of common stock	[1]	$ (70,726)	$ (23)		(70,703)			(70,726)
Restricted stock units ("RSUs") vested (shares)			244,760
Restricted stock units (“RSUs”) vested		0	$ 2		(2)
Dividends on common stock		(17,272)			218		(17,490)	(17,272)
Transactions with non-controlling interests		9,309							9,309
Stock-based compensation expense and other (in shares)			9,014
Stock-based compensation expense and other		6,358			6,358		0	6,358
Ending balances (in shares) at Sep. 30, 2022			43,723,658
Ending balances at Sep. 30, 2022		970,389	$ 437		468,662	535	465,134	934,768	35,621
Beginning balances (in shares) at Jun. 30, 2022			44,078,469
Beginning balances at Jun. 30, 2022		904,971	$ 441		467,159	2,388	401,667	871,655	33,316
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		65,198					69,302	69,302	(4,104)
Other comprehensive income (loss)		$ (1,853)				(1,853)		(1,853)
Repurchases of common stock (shares)		(366,785)	(378,790)	[2]
Repurchase of common stock	[2]	$ (350)	$ (4)		(346)			(350)
Restricted stock units ("RSUs") vested (shares)			23,994
Dividends on common stock		(5,685)			74		(5,759)	(5,685)
Transactions with non-controlling interests		6,409							6,409
Stock-based compensation expense and other (in shares)			(15)
Stock-based compensation expense and other		1,699			1,775		(76)	1,699
Ending balances (in shares) at Sep. 30, 2022			43,723,658
Ending balances at Sep. 30, 2022		$ 970,389	$ 437		468,662	535	465,134	934,768	35,621
Beginning balances (in shares) at Dec. 31, 2022		43,743,907	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 income		7,878					17,601	17,601	(9,723)
Other comprehensive income (loss)		106				106		106
Repurchases of common stock (shares)	[1]		(96,936)
Repurchase of common stock	[1]	(3,901)	$ (1)		(3,900)			(3,901)
Restricted stock units ("RSUs") vested (shares)			272,528
Restricted stock units (“RSUs”) vested			$ 3		(3)
Dividends on common stock		(17,123)			226		(17,349)	(17,123)
Capped call transactions		(39,379)			(39,379)			(39,379)
Redemption of warrants		(13,201)			(13,201)			(13,201)
Loss on debt extinguishment (in shares)			1,390,500
Common stock issued in debt extinguishment		49,335	$ 14		49,321			49,335
Exercise of bond hedge (in shares)			(1,390,516)
Exercise of bond hedge			$ (14)		14
Transactions with non-controlling interests		28,823							28,823
Stock-based compensation expense and other (in shares)			7,093
Stock-based compensation expense and other		$ 8,894			8,894			8,894
Ending balances (in shares) at Sep. 30, 2023		43,926,576	43,926,576
Ending balances at Sep. 30, 2023		$ 1,006,577	$ 439		472,379	894	481,636	955,348	51,229
Beginning balances (in shares) at Jun. 30, 2023			43,918,798
Beginning balances at Jun. 30, 2023		941,450	$ 439		470,511	795	429,797	901,542	39,908
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		57,496					57,624	57,624	(128)
Other comprehensive income (loss)		99				99		99
Repurchases of common stock (shares)	[2]		(3,334)
Repurchase of common stock	[2]	(134)			(134)			(134)
Restricted stock units ("RSUs") vested (shares)			11,166
Dividends on common stock		(5,709)			76		(5,785)	(5,709)
Transactions with non-controlling interests		11,449							11,449
Stock-based compensation expense and other (in shares)			(54)
Stock-based compensation expense and other		$ 1,926			1,926			1,926
Ending balances (in shares) at Sep. 30, 2023		43,926,576	43,926,576
Ending balances at Sep. 30, 2023		$ 1,006,577	$ 439		$ 472,379	$ 894	$ 481,636	$ 955,348	$ 51,229

[1] During the nine months ended September 30, 2023 and 2022, there were 96,936 shares and 69,659 shares, respectively, withheld related to employee taxes for RSUs vested under our equity incentive plans. During the nine months ended September 30, 2022, we also repurchased 2,298,353 shares under the Board approved share repurchase program.

[2] During the three months ended September 30, 2023 and 2022, there were 3,334 shares and 9,641 shares, respectively, withheld related to employee taxes for restricted stock units ("RSUs") vested under our equity incentive plans. During the three months ended September 30, 2022, we also repurchased 366,785 shares under the Board approved share repurchase program.