The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Business Segments (Narrative) (Details) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2016 USD ($) $ / shares	Mar. 31, 2016 USD ($) $ / shares	Jun. 30, 2015 USD ($) $ / shares	Jun. 30, 2016 USD ($) segment $ / shares	Jun. 30, 2015 USD ($) $ / shares
Segment Reporting Information [Line Items]
Number of reportable segments \| segment				3
Income from construction operations	$ 48,829		$ 30,881	$ 88,951	$ 50,965
Net income	$ 21,361		$ 11,777	$ 36,760	$ 16,903
DILUTED EARNINGS PER COMMON SHARE (in dollars per share) \| $ / shares	$ 0.43		$ 0.24	$ 0.74	$ 0.34
Depreciation and amortization				$ 29,956	$ 20,389
Tutor Perini Corporation [Member]
Segment Reporting Information [Line Items]
Income from construction operations	$ 15,830		$ 18,799	16,608	20,223
Net income	21,361		11,777	36,760	16,903
Depreciation and amortization				12,244	4,919
Building [Member]
Segment Reporting Information [Line Items]
Income from construction operations	13,223		(12,592)	25,673	(14,870)
Depreciation and amortization	500		800	1,100	1,500
Building [Member] \| Scenario Unfavorable Adjustment [Member]
Segment Reporting Information [Line Items]
Income from construction operations			$ (14,700)		$ 17,700
DILUTED EARNINGS PER COMMON SHARE (in dollars per share) \| $ / shares			$ (0.17)		$ 0.21
Civil [Member]
Segment Reporting Information [Line Items]
Income from construction operations	45,056		$ 46,329	78,721	$ 76,923
Depreciation and amortization	12,400		5,600	20,500	11,100
Specialty Contractors [Member]
Segment Reporting Information [Line Items]
Income from construction operations	5,413		13,743	14,826	24,267
Depreciation and amortization	1,300		1,400	2,600	2,700
Corporate [Member]
Segment Reporting Information [Line Items]
Income from construction operations	(14,863)		(16,599)	(30,269)	(35,355)
Depreciation and amortization	$ 2,900		$ 2,600	$ 5,800	$ 5,100
Completed Project [Member] \| Scenario Favorable Adjustment [Member]
Segment Reporting Information [Line Items]
Income from construction operations		$ 14,000
DILUTED EARNINGS PER COMMON SHARE (in dollars per share) \| $ / shares		$ 0.17
Substatially Completed Project [Member] \| Scenario Unfavorable Adjustment (b) [Member]
Segment Reporting Information [Line Items]
Income from construction operations		$ 13,800
DILUTED EARNINGS PER COMMON SHARE (in dollars per share) \| $ / shares		$ 0.17
Five Star Electric [Member] \| Specialty Contractors [Member] \| Scenario Favorable Adjustment [Member]
Segment Reporting Information [Line Items]
Income from construction operations		$ 3,000
DILUTED EARNINGS PER COMMON SHARE (in dollars per share) \| $ / shares		$ 0.04