Construction Joint Ventures - Schedule of Unconsolidated Construction Joint Ventures Assets and Liabilities (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Construction Joint Venture
Equity in Construction Joint Ventures	[1]	$ 232,536	$ 231,887	$ 219,307
Joint Venture Unconsolidated | Unconsolidated Construction Joint Venture
Construction Joint Venture
Unconsolidated Construction Joint Venture Assets, Noncurrent Assets		219,435	219,825	205,517
Other Partners Interest in Partnerships [Member] | Unconsolidated Construction Joint Venture
Construction Joint Venture
Unconsolidated Construction Joint Venture Assets		757,537	869,782	876,118
Unconsolidated Construction Joint Venture Liabilities	[2]	423,518	462,159	447,502
Reporting Entitys Interest in Joint Venture [Member] | Unconsolidated Construction Joint Venture
Construction Joint Venture
Unconsolidated Construction Joint Venture Assets	[3],[4]	414,657	452,560	432,342
Unconsolidated Construction Joint Venture Liabilities		182,121	220,673	213,035
Cash and Cash Equivalents | Joint Venture Unconsolidated | Unconsolidated Construction Joint Venture
Construction Joint Venture
Unconsolidated Construction Joint Venture Assets		325,157	289,940	399,445
Other Assets, Current and Longterm | Joint Venture Unconsolidated | Unconsolidated Construction Joint Venture
Construction Joint Venture
Unconsolidated Construction Joint Venture Assets	[3]	627,602	812,577	703,498
Accounts Payable | Joint Venture Unconsolidated | Unconsolidated Construction Joint Venture
Construction Joint Venture
Unconsolidated Construction Joint Venture Liabilities		$ 605,639	$ 682,832	$ 660,537

[1] 4As of March 31, 2018, December 31, 2017 and March 31, 2017, this balance included $22.3 million, $15.9 million and $16.4 million, respectively, of deficit in construction joint ventures that is included in accrued expenses and other current liabilities in the condensed consolidated balance sheets

[2] 3Partners’ interest and adjustments includes amounts to reconcile total net assets as reported by our partners to Granite’s interest adjusted to reflect our accounting policies primarily related to gross profit forecast differences.

[3] 1Included in this balance and in accrued and other current liabilities on our condensed consolidated balance sheets as of March 31, 2018, December 31, 2017 and March 31, 2017 was $88.6 million, $88.6 million and $83.1 million respectively, related to performance guarantees.

[4] 2Included in this balance as of March 31, 2018, December 31, 2017 and March 31, 2017 was $65.0 million, $74.3 million and $69.7 million respectively, related to Granite’s share of estimated cost recovery of customer affirmative claims. In addition, this balance included $11.3 million, $11.8 million and $7.9 million related to Granite’s share of estimated recovery of back charge claims as of March 31, 2018, December 31, 2017 and March 31, 2017, respectively.