Construction Joint Ventures - Schedule of Unconsolidated Construction Joint Ventures Revenue and Costs (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Construction And Line Item Joint Ventures Abstract
Total cost of revenue		$ 579,323	$ 507,096
Collaborative Arrangement [Member]
Construction And Line Item Joint Ventures Abstract
Unconsolidated Construction Joint Venture Revenue		132,493	118,409
Total cost of revenue		131,479	114,388
Unconsolidated Construction Joint Venture Gross Profit		1,014	4,021
Collaborative Arrangement [Member] | Corporate Joint Venture [Member]
Construction And Line Item Joint Ventures Abstract
Unconsolidated Construction Joint Venture Revenue		415,934	239,441
Total cost of revenue		411,485	380,889
Other Partners Interest in Partnerships [Member] | Collaborative Arrangement [Member] | Co-venturer [Member]
Construction And Line Item Joint Ventures Abstract
Unconsolidated Construction Joint Venture Revenue	[1]	283,441	121,032
Total cost of revenue	[1]	$ 280,006	$ 266,501

[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.