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Goodwill and Other Intangible Assets - Intangible Assets Subject to Amortization (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period $ 24,559 $ 31,158  
Reclassification   (1,805)  
Periodic Amortization (3,849) (4,419) $ (900)
Effect of Translation (24) (460)  
Acquisitions 10,194 85  
Balance as of end of period 30,880 24,559 31,158
Other      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 2,279 6,000  
Reclassification   (1,805)  
Periodic Amortization (1,276) (1,916)  
Effect of Translation 0 0  
Acquisitions 0 0  
Balance as of end of period 1,003 2,279 6,000
Non-operating Corporate      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 22 22  
Reclassification   0  
Periodic Amortization (4) 0  
Effect of Translation 0 0  
Acquisitions 0 0  
Balance as of end of period 18 22 22
Trade names      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 10,013 11,338  
Periodic Amortization (1,305) (1,274)  
Effect of Translation (15) (51)  
Acquisitions 1,198    
Balance as of end of period 9,891 10,013 11,338
Trade names | Other      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 0 0  
Periodic Amortization 0 0  
Effect of Translation 0 0  
Acquisitions 0    
Balance as of end of period 0 0 0
Trade names | Non-operating Corporate      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 0 0  
Periodic Amortization 0 0  
Effect of Translation 0 0  
Acquisitions 0    
Balance as of end of period 0 0 0
Customer relationships      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 11,238 12,520  
Periodic Amortization 989 (931)  
Effect of Translation (9) (351)  
Acquisitions 8,431    
Balance as of end of period 18,671 11,238 12,520
Customer relationships | Other      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 0 0  
Periodic Amortization 0 0  
Effect of Translation 0 0  
Acquisitions 0    
Balance as of end of period 0 0 0
Customer relationships | Non-operating Corporate      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 0 0  
Periodic Amortization 0 0  
Effect of Translation 0 0  
Acquisitions 0    
Balance as of end of period 0 0 0
Developed technology      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 3,089 1,164  
Reclassification   4,195  
Periodic Amortization (1,547) (2,212)  
Effect of Translation   (58)  
Balance as of end of period 1,542 3,089 1,164
Developed technology | Other      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 2,279 0  
Reclassification   4,195  
Periodic Amortization (1,276) (1,916)  
Effect of Translation   0  
Balance as of end of period 1,003 2,279 0
Developed technology | Non-operating Corporate      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 0 0  
Reclassification   0  
Periodic Amortization 0 0  
Effect of Translation   0  
Balance as of end of period 0 0 0
Other      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 219 6,136  
Reclassification   (6,000)  
Periodic Amortization (8) (2)  
Acquisitions 565 85  
Balance as of end of period 776 219 6,136
Other | Other      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 0 6,000  
Reclassification   (6,000)  
Periodic Amortization 0 0  
Acquisitions 0 0  
Balance as of end of period 0 0 6,000
Other | Non-operating Corporate      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 22 22  
Reclassification   0  
Periodic Amortization (4) 0  
Acquisitions 0 0  
Balance as of end of period 18 22 22
Operating Segments | Construction      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 4,005 4,304  
Reclassification   0  
Periodic Amortization (297) (299)  
Effect of Translation (9) 0  
Acquisitions 4,402 0  
Balance as of end of period 8,101 4,005 4,304
Operating Segments | Marine Services      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 8,205 9,800  
Reclassification   0  
Periodic Amortization (1,099) (1,135)  
Effect of Translation (15) (460)  
Acquisitions 690 0  
Balance as of end of period 7,781 8,205 9,800
Operating Segments | Energy      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 9,871 10,918  
Reclassification   0  
Periodic Amortization (1,169) (1,067)  
Effect of Translation 0 0  
Acquisitions 5,055 20  
Balance as of end of period 13,757 9,871 10,918
Operating Segments | Life Sciences      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 177 114  
Reclassification   0  
Periodic Amortization (4) (2)  
Effect of Translation 0 0  
Acquisitions 47 65  
Balance as of end of period 220 177 114
Operating Segments | Trade names | Construction      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 4,005 4,304  
Periodic Amortization (297) (299)  
Effect of Translation 0 0  
Acquisitions 508    
Balance as of end of period 4,216 4,005 4,304
Operating Segments | Trade names | Marine Services      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 601 997  
Periodic Amortization (378) (345)  
Effect of Translation (15) (51)  
Acquisitions 690    
Balance as of end of period 898 601 997
Operating Segments | Trade names | Energy      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 5,407 6,037  
Periodic Amortization (630) (630)  
Effect of Translation 0 0  
Acquisitions 0    
Balance as of end of period 4,777 5,407 6,037
Operating Segments | Trade names | Life Sciences      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 0 0  
Periodic Amortization 0 0  
Effect of Translation 0 0  
Acquisitions 0    
Balance as of end of period 0 0 0
Operating Segments | Customer relationships | Construction      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 0 0  
Periodic Amortization 0 0  
Effect of Translation (9) 0  
Acquisitions 3,447    
Balance as of end of period 3,438 0 0
Operating Segments | Customer relationships | Marine Services      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 6,794 7,639  
Periodic Amortization (450) (494)  
Effect of Translation 0 (351)  
Acquisitions 0    
Balance as of end of period 6,344 6,794 7,639
Operating Segments | Customer relationships | Energy      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 4,444 4,881  
Periodic Amortization (539) (437)  
Effect of Translation 0 0  
Acquisitions 4,984    
Balance as of end of period 8,889 4,444 4,881
Operating Segments | Customer relationships | Life Sciences      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 0 0  
Periodic Amortization 0 0  
Effect of Translation 0 0  
Acquisitions 0    
Balance as of end of period 0 0 0
Operating Segments | Developed technology | Construction      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 0 0  
Reclassification   0  
Periodic Amortization 0 0  
Effect of Translation   0  
Balance as of end of period 0 0 0
Operating Segments | Developed technology | Marine Services      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 810 1,164  
Reclassification   0  
Periodic Amortization (271) (296)  
Effect of Translation   (58)  
Balance as of end of period 539 810 1,164
Operating Segments | Developed technology | Energy      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 0 0  
Reclassification   0  
Periodic Amortization 0 0  
Effect of Translation   0  
Balance as of end of period 0 0 0
Operating Segments | Developed technology | Life Sciences      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 0 0  
Reclassification   0  
Periodic Amortization 0 0  
Effect of Translation   0  
Balance as of end of period 0 0 0
Operating Segments | Other | Construction      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 0 0  
Reclassification   0  
Periodic Amortization 0 0  
Acquisitions 447 0  
Balance as of end of period 447 0 0
Operating Segments | Other | Marine Services      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 0 0  
Reclassification   0  
Periodic Amortization 0 0  
Acquisitions 0 0  
Balance as of end of period 0 0 0
Operating Segments | Other | Energy      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 20 0  
Reclassification   0  
Periodic Amortization 0 0  
Acquisitions 71 20  
Balance as of end of period 91 20 0
Operating Segments | Other | Life Sciences      
Finite-lived Intangible Assets [Roll Forward]      
Balance as of beginning of period 177 114  
Reclassification   0  
Periodic Amortization (4) (2)  
Acquisitions 47 65  
Balance as of end of period $ 220 $ 177 $ 114