Business Segments (Reconciliation of Segment Results to Consolidated Income Before Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income from construction operations	$ 48,829	$ 30,881	$ 88,951	$ 50,965
Other income (expense), net	2,485	379	3,166	(97)
Interest expense	(15,534)	(11,268)	(29,614)	(22,671)
INCOME BEFORE INCOME TAXES	35,780	19,992	62,503	28,197
Tutor Perini Corporation [Member]
Income from construction operations	15,830	18,799	16,608	20,223
Other income (expense), net	1,568	(187)	946	(1,977)
Interest expense	(15,396)	(10,413)	(28,880)	(20,955)
INCOME BEFORE INCOME TAXES	$ 22,345	$ 14,785	$ 32,096	$ 15,817