Construction Joint Ventures - Schedule of Unconsolidated Construction Joint Ventures Assets and Liabilities (Details) - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Construction Joint Venture
Unconsolidated Construction Joint Venture Assets, Noncurrent Assets		$ 215,129	$ 204,090	$ 219,435
Equity in Construction Joint Ventures	[1]	297,817	271,162	232,536
Other Partners Interest in Partnerships [Member]
Construction Joint Venture
Unconsolidated Construction Joint Venture Assets		885,901	822,215	757,537
Unconsolidated Construction Joint Venture Liabilities	[2]	372,770	369,782	423,518
Reporting Entitys Interest in Joint Venture [Member]
Construction Joint Venture
Unconsolidated Construction Joint Venture Assets	[3],[4]	458,372	426,416	414,657
Unconsolidated Construction Joint Venture Liabilities		160,555	155,254	182,121
Cash and Cash Equivalents [Member]
Construction Joint Venture
Unconsolidated Construction Joint Venture Assets		281,355	229,562	325,157
Other Assets, Current and Longterm [Member]
Construction Joint Venture
Unconsolidated Construction Joint Venture Assets	[3]	847,789	814,979	627,602
Accounts Payable [Member]
Construction Joint Venture
Unconsolidated Construction Joint Venture Liabilities		$ 533,325	$ 525,036	$ 605,639

[1] Included in this balance and in accrued expenses and other current liabilities on the condensed consolidated balance sheets were amounts related to deficits in construction joint ventures that were $2.7 million, $11.5 million and $22.3 million as of March 31, 2019, December 31, 2018 and March 31, 2018, respectively

[2] Partners’ 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 and estimates primarily related to contract forecast differences

[3] 1Included in this balance and in accrued expenses and other current liabilities on our condensed consolidated balance sheets was $88.2 million related to performance guarantees as of both March 31, 2019 and December 31, 2018 and $88.6 million as of March 31, 2018.

[4] 2Included in this balance as of March 31, 2019, December 31, 2018 and March 31, 2018 was $80.8 million, $78.1 million and $65.0 million, respectively, related to Granite’s share of estimated cost recovery of customer affirmative claims. In addition, this balance included $16.0 million, $15.6 million and $11.3 million related to Granite’s share of estimated recovery of back charge claims as of March 31, 2019, December 31, 2018 and March 31, 2018, respectively