CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 18,457	$ 9,539	$ 7,947	$ 929
Other comprehensive (loss) income, net of tax:
Net unrealized loss on derivatives	(507)	0	(1,398)	0
Less: reclassification for net losses included in interest expense	100	0	100	0
Net change	(407)	0	(1,298)	0
Foreign currency translation adjustments	165	133	987	(396)
Other comprehensive (loss) income	(242)	133	(311)	(396)
Comprehensive income	18,215	9,672	7,636	533
Non-controlling interests in comprehensive income	(4,327)	74	(5,005)	124
Comprehensive income attributable to Granite	$ 13,888	$ 9,746	$ 2,631	$ 657