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Summary of Significant Accounting Policies (Schedule of the Impact for the Adoption of ASU 2014-09) (Details) - USD ($)
$ 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
Jan. 01, 2018
ASSETS                        
Accounts receivable $ 1,261,072       $ 1,265,717       $ 1,261,072 $ 1,265,717   $ 1,265,717
Retainage receivable 478,744       535,939       478,744 535,939   535,939
Costs and estimated earnings in excess of billings 1,142,295       932,758       1,142,295 932,758   932,758
Other Current Assets 115,527       89,316       115,527 89,316   122,089
LIABILITIES                        
Accounts payable 621,728       699,971       621,728 699,971   699,971
Retainage payable 211,956       261,820       211,956 261,820   261,820
Billings in excess of costs and estimated earnings 573,190       456,869       573,190 456,869   496,654
Accrued expenses and other current liabilities 174,325       132,438       174,325 132,438    
Deferred income taxes 105,521       108,504       105,521 108,504   106,967
EQUITY                        
Retained earnings 701,681       622,007       701,681 622,007   618,245
Noncontrolling interests (21,288)       (8,495)       (21,288) (8,495)   (10,209)
STATEMENT OF OPERATIONS                        
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      
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  
Balance Without Adoption of ASC 606 [Member]                        
ASSETS                        
Accounts receivable [1] 1,735,414       1,801,656 [2]       1,735,414 1,801,656 [2]    
Costs and estimated earnings in excess of billings 1,148,216               1,148,216      
Other Current Assets 79,004       89,316 [2]       79,004 89,316 [2]    
LIABILITIES                        
Accounts payable [1] 833,684       961,791 [2]       833,684 961,791 [2]    
Billings in excess of costs and estimated earnings 530,918       456,869 [2]       530,918 456,869 [2]    
Accrued expenses and other current liabilities 174,824               174,824      
Deferred income taxes 106,665       108,504 [2]       106,665 108,504 [2]    
EQUITY                        
Retained earnings 705,725       622,007 [2]       705,725 622,007 [2]    
Noncontrolling interests (19,707)       $ (8,495) [2]       (19,707) $ (8,495) [2]    
STATEMENT OF OPERATIONS                        
REVENUE                 4,458,668      
COST OF OPERATIONS                 (4,003,959)      
GROSS PROFIT                 454,709      
General and administrative expenses                 (262,577)      
INCOME FROM CONSTRUCTION OPERATIONS                 192,132      
Other income, net                 4,256      
Interest expense                 (63,519)      
INCOME BEFORE INCOME TAXES                 132,869      
Income tax (expense) benefit                 (34,939)      
NET INCOME                 97,930      
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS                 14,212      
NET INCOME ATTRIBUTABLE TO TUTOR PERINI CORPORATION                 83,718      
Effect of Change [Member]                        
ASSETS                        
Accounts receivable [1] (474,342)               (474,342)     (535,939)
Retainage receivable [1] 478,744               478,744     535,939
Costs and estimated earnings in excess of billings (5,921)               (5,921)      
Other Current Assets 36,523               36,523     32,773
LIABILITIES                        
Accounts payable [1] (211,956)               (211,956)     (261,820)
Retainage payable [1] 211,956               211,956     261,820
Billings in excess of costs and estimated earnings 42,272               42,272     39,785
Accrued expenses and other current liabilities (499)               (499)      
Deferred income taxes (1,144)               (1,144)     (1,537)
EQUITY                        
Retained earnings (4,044)               (4,044)     (3,762)
Noncontrolling interests $ (1,581)               (1,581)     $ (1,714)
STATEMENT OF OPERATIONS                        
REVENUE                 (4,006)      
COST OF OPERATIONS                 3,750      
GROSS PROFIT                 (256)      
INCOME FROM CONSTRUCTION OPERATIONS                 (256)      
INCOME BEFORE INCOME TAXES                 (256)      
Income tax (expense) benefit                 107      
NET INCOME                 (149)      
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS                 133      
NET INCOME ATTRIBUTABLE TO TUTOR PERINI CORPORATION                 $ (282)      
[1] Prior to the adoption of ASC 606, retainage receivable and payable balances were included within accounts receivable and accounts payable, respectively.
[2] Balances as previously reported on the Company's Annual Report on Form 10-K for the year ended December 31, 2017.