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Business Acquisitions, Goodwill and Intangible Assets - Acquisitions (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Oct. 17, 2014
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2016
USD ($)
item
Business acquisition        
Number of acquisition | item       1
Consideration paid in cash       $ 5,500
Acquisition and integration expenses        
Total   $ 15,412 $ 41,038  
Loss on disposal activities     (41,053)  
Trademark / tradename | Minimum        
Business acquisition        
Useful life   3 months 18 days    
Trademark / tradename | Maximum        
Business acquisition        
Useful life   2 years    
URS Corporation        
Business acquisition        
Consideration paid in cash $ 2,300,000      
Percentage of ownership acquired 100.00%      
Consideration paid by issuing stock $ 1,600,000      
Senior notes assumed in acquisition as part of consideration net of repayments 400,000      
Repayment of acquiree term loan as part of consideration 600,000      
Repayment of acquiree line of credit as part of consideration 100,000      
Accrued expenses and other current liabilities 240,000      
Amortization of intangible assets of acquiree since acquisition date   $ 20,900 59,000  
Fair value adjustment of joint ventures   2,000 9,700  
Fair value adjustment of noncontrolling interests   (2,100) (5,700)  
Fair value of margin liability 149,100      
Billings in excess of costs on uncompleted contracts   $ 13,300    
Years the majority liability will be recognized   2 years    
Revenue and related income from operations   $ 1,600 15,100  
Acquisition and integration expenses        
Severance and personnel costs   11,500 6,600  
Professional service, real estate-related, and other expenses   3,900 34,400  
Total   15,400 41,000  
Severance expense   8,700 6,600  
Severance expense paid   0 4,300  
Financing-related expenses   2,800 $ 4,100  
URS Corporation | Non-core        
Acquisition and integration expenses        
Loss on disposal activities   (41,000)    
Net assets related to the loss on disposal activities   99,600    
Income from continuing operations of acquiree since acquisition date   $ (7,100)    
URS Corporation | Customer relationships, contracts and backlog        
Business acquisition        
Acquired backlog and customer relationship assets $ 973,800      
URS Corporation | Customer relationships, contracts and backlog | Minimum        
Business acquisition        
Useful life 1 year      
URS Corporation | Customer relationships, contracts and backlog | Maximum        
Business acquisition        
Useful life 11 years      
URS Corporation | Customer relationships, contracts and backlog | Weighted Average        
Business acquisition        
Useful life 3 years