CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
REVENUE	$ 1,183,284	$ 1,123,137	$ 1,120,085	$ 1,028,156	$ 1,193,068	$ 1,199,505	$ 1,247,274	$ 1,117,361	$ 4,454,662	$ 4,757,208	$ 4,973,076
COST OF OPERATIONS									(4,000,209)	(4,302,803)	(4,515,886)
GROSS PROFIT	157,621	111,124	118,640	67,068	130,596	118,251	102,838	102,720	454,453	454,405	457,190
General and administrative expenses									(262,577)	(274,928)	(255,270)
INCOME FROM CONSTRUCTION OPERATIONS	90,680	47,306	54,815	(925)	59,343	49,072	34,045	37,017	191,876	179,477	201,920
Other income, net									4,256	43,882	6,977
Interest expense									(63,519)	(69,384)	(59,782)
INCOME BEFORE INCOME TAXES	75,152	32,804	39,867	(15,210)	45,193	34,396	52,516	21,870	132,613	153,975	149,115
Income tax (expense) benefit									(34,832)	569	(53,293)
NET INCOME	55,391	25,436	27,896	(10,942)	82,847	25,300	32,633	13,764	97,781	154,544	95,822
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									14,345	6,162
NET INCOME ATTRIBUTABLE TO TUTOR PERINI CORPORATION	$ 49,405	$ 21,272	$ 24,883	$ (12,124)	$ 80,938	$ 23,584	$ 30,096	$ 13,764	$ 83,436	$ 148,382	$ 95,822
BASIC EARNINGS PER COMMON SHARE	$ 0.99	$ 0.43	$ 0.50	$ (0.24)	$ 1.63	$ 0.47	$ 0.61	$ 0.28	$ 1.67	$ 2.99	$ 1.95
DILUTED EARNINGS PER COMMON SHARE	$ 0.98	$ 0.42	$ 0.49	$ (0.24)	$ 1.60	$ 0.47	$ 0.59	$ 0.27	$ 1.66	$ 2.92	$ 1.92
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING:
BASIC									49,952	49,647	49,150
DILUTED									50,301	50,759	49,864