Construction Joint Ventures - Schedule of Unconsolidated Construction Joint Ventures Revenue and Costs (Details) - USD ($)		3 Months Ended				9 Months Ended
		Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Variable Interest Entity [Line Items]
Total Unconsolidated JV and Partner's Interest in Revenue As reported			$ 552,986	$ 141,785	$ 382,465		$ 1,018,565
Total Unconsolidated JV Cost of Revenue As reported					424,492		1,270,793
Partner's Interest in Cost of Revenue As reported					287,784		879,653
Total Unconsolidated JV Revenue As adjusted			475,879	494,167
Partner's Interest in Revenue As adjusted			346,863	347,908
Total Unconsolidated JV Revenue As reported			$ 682,002	$ 288,044	530,215		1,439,766
Joint Venture Unconsolidated | Unconsolidated Construction Joint Venture
Variable Interest Entity [Line Items]
Unconsolidated Construction Joint Venture Revenue	[1]	$ 550,296,000			485,639,000	$ 1,520,342,000	1,395,190,000
Unconsolidated Construction Joint Venture Cost of Revenue		510,579,000			469,069,000	1,451,189,000	1,315,370,000
Unconsolidated Construction Joint Venture Net Income		38,700,000			19,500,000	68,000,000	86,900,000
Parent Company [Member] | Unconsolidated Construction Joint Venture
Variable Interest Entity [Line Items]
Unconsolidated Construction Joint Venture Net Income		10,300,000			11,100,000	15,900,000	29,700,000
Other Partners Interest in Joint Venture [Member] | Unconsolidated Construction Joint Venture
Variable Interest Entity [Line Items]
Unconsolidated Construction Joint Venture Revenue	[1],[2]	390,775,000			337,889,000	1,085,546,000	973,989,000
Unconsolidated Construction Joint Venture Cost of Revenue	[2]	360,965,000			332,361,000	1,032,667,000	924,230,000
Reporting Entitys Interest in Joint Venture [Member] | Unconsolidated Construction Joint Venture
Variable Interest Entity [Line Items]
Unconsolidated Construction Joint Venture Revenue		159,521,000			147,750,000	434,796,000	421,201,000
Unconsolidated Construction Joint Venture Cost of Revenue		149,614,000			136,708,000	418,522,000	391,140,000
Unconsolidated Construction Joint Venture Gross Profit Loss		$ 9,907,000			$ 11,042,000	$ 16,274,000	$ 30,061,000

[1] 1While Granite’s interest in revenue, cost of revenue and gross profit were correctly stated, Total revenue and revenue for partners’ interest and adjustments for the three months ended March 31, 2016 and June 30, 2016 were misstated in our Quarterly Reports for the quarter ended March 31, 2016 and June 30, 2016. Total revenue and revenue for partner’s interest and adjustments as reported was (in thousands): $288,044 and $141,785, respectively, for the three months ended March 31, 2016 and was $682,002 and $552,986, respectively, for the three months ended June 30, 2016. Total revenue and revenue for partner’s interest and adjustments should have been (in thousands): $494,167 and $347,908, respectively, for the three months ended March 31, 2016 and $475,879 and $346,863, respectively, for the three months ended June 30, 2016. The misstatements did not have any impact on the consolidated financial statements in any period. We assessed the materiality of the errors in accordance with the SEC’s Staff Accounting Bulletin 99 and concluded that the errors were not material to either of these previously issued financial statements. Accordingly, we will revise our previously issued financial statements prospectively to correct these errors.

[2] Partners’ 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.