Construction Joint Ventures - Schedule of Unconsolidated Construction Joint Ventures Revenue and Costs (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Variable Interest Entity [Line Items]
Unconsolidated Construction Joint Venture Gross Profit		$ 4,021	$ 1,496
Joint Venture Unconsolidated | Unconsolidated Construction Joint Venture
Variable Interest Entity [Line Items]
Unconsolidated Construction Joint Venture Revenue		239,441	451,321
Unconsolidated Construction Joint Venture Cost of Revenue		380,889	442,990
Other Partners Interest in Partnerships [Member] | Unconsolidated Construction Joint Venture
Variable Interest Entity [Line Items]
Unconsolidated Construction Joint Venture Revenue	[1]	121,032	323,830
Unconsolidated Construction Joint Venture Cost of Revenue	[1]	266,501	316,995
Reporting Entitys Interest in Joint Venture [Member] | Unconsolidated Construction Joint Venture
Variable Interest Entity [Line Items]
Unconsolidated Construction Joint Venture Revenue		118,409	127,491
Unconsolidated Construction Joint Venture Cost of Revenue		$ 114,388	$ 125,995

[1] 1Partners’ interest and adjustments represents 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.