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Business Segments and Geographic Information - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
segment
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Schedule of Equity Method Investments [Line Items]          
Number of reportable business segments | segment     4    
Equity in earnings of affiliates, net of income tax provision $ 1,342 $ 1,693 $ 4,255 $ 4,943  
Investment in affiliate 0   $ 0   $ 0
SACS          
Schedule of Equity Method Investments [Line Items]          
Ownership percentage in entity     50.00%    
Equity in earnings of affiliates, net of income tax provision 1,100 1,100 $ 3,400 2,900  
Investment in joint venture 10,400   $ 10,400   11,800
Geo Amey          
Schedule of Equity Method Investments [Line Items]          
Ownership percentage in entity     50.00%    
Equity in earnings of affiliates, net of income tax provision 200 $ 700 $ 800 $ 2,100  
Investment in affiliate 2,300   2,300   $ 1,300
Ravenhall, Australia          
Schedule of Equity Method Investments [Line Items]          
Provision for loss on contracts $ 1,900   $ 1,900