Construction Joint Ventures - Schedule of Unconsolidated Construction Joint Ventures Assets and Liabilities (Details) - USD ($) $ in Thousands		Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Construction Joint Venture
Affirmative Claim Recovery Estimate		$ 21,600	$ 12,300	$ 7,800
Unconsolidated Joint Venture Back charges claims		11,100	5,600	5,900
Deficit in unconsolidatedconstruction joint venture		16,000	16,600	6,800
Equity in Construction Joint Ventures	[1]	226,385	230,534	256,358
Unconsolidated Construction Joint Venture
Construction Joint Venture
Performance Guarantees		88,900	83,100	83,100
Joint Venture Unconsolidated | Unconsolidated Construction Joint Venture
Construction Joint Venture
Unconsolidated Construction Joint Venture Assets, Noncurrent Assets		223,449	207,240	212,620
Reporting Entitys Interest in Joint Venture [Member] | Unconsolidated Construction Joint Venture
Construction Joint Venture
Affirmative Claim Recovery Estimate		77,600	65,400	62,500
Unconsolidated Construction Joint Venture Assets	[2],[3]	431,382	454,425	463,935
Unconsolidated Construction Joint Venture Liabilities		204,997	223,891	207,577
Other Partners Interest in Partnerships [Member] | Unconsolidated Construction Joint Venture
Construction Joint Venture
Unconsolidated Construction Joint Venture Assets		846,832	935,615	942,183
Unconsolidated Construction Joint Venture Liabilities	[4]	445,068	472,324	449,044
Cash and Cash Equivalents [Member] | Joint Venture Unconsolidated | Unconsolidated Construction Joint Venture
Construction Joint Venture
Unconsolidated Construction Joint Venture Assets		333,751	537,991	509,644
Other Assets, Current and Longterm [Member] | Joint Venture Unconsolidated | Unconsolidated Construction Joint Venture
Construction Joint Venture
Unconsolidated Construction Joint Venture Assets	[2]	721,014	644,809	683,854
Accounts Payable [Member] | Joint Venture Unconsolidated | Unconsolidated Construction Joint Venture
Construction Joint Venture
Unconsolidated Construction Joint Venture Liabilities		$ 650,065	$ 696,215	$ 656,621

[1] As of September 30, 2017, December 31, 2016 and September 30, 2016, this balance included $16.0 million, $16.6 million and $6.8 million, respectively, of deficit in construction joint ventures that is included in accrued expenses and other current liabilities on the condensed consolidated balance sheets

[2] Included in this balance and in accrued and other current liabilities on our condensed consolidated balance sheets as of September 30, 2017, December 31, 2016 and September 30, 2016 was $88.9 million, $83.1 million and $83.1 million, respectively, related to performance guarantees.

[3] Included in this balance as of September 30, 2017, December 31, 2016 and September 30, 2016 was $77.6 million, $65.4 million and $62.5 million, respectively, related to Granite’s share of estimated cost recovery of customer affirmative claims. In addition, this balance included $11.1 million, $5.6 million and $5.9 million related to Granite’s share of estimated recovery of back charge claims as of September 30, 2017, December 31, 2016 and September 30, 2016, respectively.

[4] Partners’ interest and adjustments includes amounts to reconcile total liabilities as reported by our partners to Granite’s interest adjusted to reflect our accounting policies.