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Business Acquisitions, Goodwill and Intangible Assets (Details 3) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Identifiable intangible assets with finite useful lives      
Gross Amount $ 1,241,100 $ 1,238,400  
Accumulated Amortization (581,700) (646,800)  
Intangible Assets, Net 659,438 591,631  
Amortization expense   65,100 $ 105,900
Estimated amortization expense of intangible assets for the remainder of fiscal 2016 and for the succeeding years      
2016 (nine months remaining)   128,400  
2017   93,500  
2018   79,300  
2019   73,900  
2020   61,800  
Thereafter   154,700  
Intangible Assets, Net 659,438 591,631  
Backlog and customer relationships      
Identifiable intangible assets with finite useful lives      
Gross Amount 1,224,700 1,222,000  
Accumulated Amortization (565,300) (630,400)  
Intangible Assets, Net 659,400 591,600  
Estimated amortization expense of intangible assets for the remainder of fiscal 2016 and for the succeeding years      
Intangible Assets, Net $ 659,400 591,600  
Backlog and customer relationships | Minimum      
Identifiable intangible assets with finite useful lives      
Amortization Period 1 year    
Backlog and customer relationships | Maximum      
Identifiable intangible assets with finite useful lives      
Amortization Period 11 years    
Trademark / tradename      
Identifiable intangible assets with finite useful lives      
Gross Amount $ 16,400 16,400  
Accumulated Amortization $ (16,400) $ (16,400)  
Trademark / tradename | Minimum      
Identifiable intangible assets with finite useful lives      
Amortization Period 3 months 18 days    
Trademark / tradename | Maximum      
Identifiable intangible assets with finite useful lives      
Amortization Period 2 years