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Note 11 - Construction Joint Ventures (Details Textual)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Contract with Customer, Liability, Total $ 189,430 $ 109,299 $ 189,430 $ 109,299 $ 95,737
Contract Value of Active Construction Joint Venture Projects 3,400,000   3,400,000    
Revenue from Contract with Customer, Including Assessed Tax 1,065,189 1,112,114 2,616,887 2,560,019  
Retained Earnings (Accumulated Deficit), Ending Balance 422,846 619,690 422,846 619,690 594,353
Net Income (Loss) Attributable to Parent, Total (91,162) 45,901 (153,127) (40,811)  
Unconsolidated Construction Joint Venture Net Income (Loss)     (38,529) (93,274)  
Unconsolidated Construction Corporate Joint Venture [Member]          
Contract with Customer, Liability, Total $ 538,000   $ 538,000    
Number of Active Joint Venture Projects 10   10    
Contract Value of Active Construction Joint Venture Projects $ 11,600,000   $ 11,600,000    
Affirmative Claim Recovery Estimate 86,200 118,000 86,200 118,000 116,800
Back Charge Claims 13,800 14,800 13,800 14,800 15,900
Retained Earnings (Accumulated Deficit), Ending Balance 75,100 82,200 75,100 82,200 76,200
Net Income (Loss) Attributable to Parent, Total (6,000)   (144,500)    
Unconsolidated Construction Joint Venture Net Income (Loss) (8,000)   (38,500)    
Unconsolidated Construction Corporate Joint Venture [Member] | Minimum [Member]          
Contract with Customer, Liability, Total 1,100   1,100    
Contract Value of Active Construction Joint Venture Projects $ 12,100   $ 12,100    
Equity Method Investment, Ownership Percentage 20.00%   20.00%    
Unconsolidated Construction Corporate Joint Venture [Member] | Maximum [Member]          
Contract with Customer, Liability, Total $ 141,100   $ 141,100    
Contract Value of Active Construction Joint Venture Projects $ 3,800,000   $ 3,800,000    
Equity Method Investment, Ownership Percentage 50.00%   50.00%    
Unconsolidated Construction Corporate Joint Venture [Member] | Performance Guarantee [Member]          
Guarantor Obligations, Maximum Exposure, Undiscounted $ 700   $ 700    
Guarantor Obligations, Current Carrying Value 82,300 81,900 82,300 81,900 $ 81,900
Unconsolidated Construction Corporate Joint Venture [Member] | Construction [Member]          
Contract with Customer, Liability, Total 1,800,000   1,800,000    
Co-venturer [Member] | Performance Guarantee [Member]          
Guarantor Obligations, Maximum Exposure, Undiscounted 1,100,000   1,100,000    
Consolidated Construction Corporate Joint Venture [Member]          
Contract Value of Active Construction Joint Venture Projects 1,000,000   1,000,000    
Consolidated Construction Corporate Joint Venture [Member] | Variable Interest Entity, Primary Beneficiary [Member]          
Contract with Customer, Liability, Total $ 451,300   $ 451,300    
Number of Active Joint Venture Projects 7   7    
Contract Value of Active Construction Joint Venture Projects $ 1,700,000   $ 1,700,000    
Revenue from Contract with Customer, Including Assessed Tax 79,200 66,100 219,900 205,600  
Net Cash Provided by (Used in) Continuing Operations, Total     17,000 19,000  
Consolidated Construction Corporate Joint Venture [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Minimum [Member]          
Contract with Customer, Liability, Total 6,500   6,500    
Contract Value of Active Construction Joint Venture Projects 26,100   $ 26,100    
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage     50.00%    
Consolidated Construction Corporate Joint Venture [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Maximum [Member]          
Contract with Customer, Liability, Total 173,800   $ 173,800    
Contract Value of Active Construction Joint Venture Projects $ 435,300   $ 435,300    
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage     65.00%    
Line Item Joint Venture [Member]          
Number of Active Joint Venture Projects 4   4    
Unconsolidated Construction Joint Venture Net Income (Loss)     $ 318,000    
Line Item Joint Venture [Member] | Variable Interest Entity, Primary Beneficiary [Member]          
Contract with Customer, Liability, Total $ 111,300   111,300    
Contract Value of Active Construction Joint Venture Projects 188,500   188,500    
Revenue from Contract with Customer, Including Assessed Tax $ 27,500 $ 9,100 $ 58,700 $ 21,300