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Note 11 - Construction Joint Ventures - Schedule of Unconsolidated Construction Joint Ventures Revenue and Costs (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Cost of revenue		$ 827,428	$ 819,334	$ 1,439,556	$ 1,400,009
Collaborative Arrangement [Member]
Revenue		96,822	101,571	180,524	212,087
Cost of revenue		115,195	153,880	210,912	284,938
Granite’s interest in gross loss		(18,373)	(52,309)	(30,388)	(72,851)
Collaborative Arrangement [Member] | Corporate Joint Venture [Member]
Revenue		384,461	436,071	446,491	852,005
Cost of revenue		356,755	456,484	585,215	867,969
Collaborative Arrangement [Member] | Co-venturer [Member] | Other Partners Interest in Partnerships [Member]
Revenue	[1]	287,639	334,500	265,967	639,918
Cost of revenue	[1]	$ 241,560	$ 302,604	$ 374,303	$ 583,031
[1] Partners' interest and adjustments includes amounts to reconcile total revenue and total cost of revenue as reported by our partners to Granite's interest adjusted to reflect our accounting policies and estimates primarily related to contract forecast differences.

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Unconsolidated construction joint venture gross profit loss.

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No definition available.

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The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856

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-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-03.2(a),(d))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

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Amount of revenue from collaborative arrangement. Excludes revenue from contract with customer under Topic 606.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 808
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=118644919&loc=SL5834089-161433

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 808
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6931272&loc=SL5834143-161434

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