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Goodwill and Other Intangible Assets - Changes in the Carrying Amount of Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Roll Forward]    
Beginning balance $ 61,178 $ 30,540
Reclassification (14) 1,781
Acquisitions 36,894 29,453
Impairments   (540)
Effect of translation   (56)
Ending balance 98,086 61,178
Construction    
Goodwill [Roll Forward]    
Beginning balance 24,490 24,612
Reclassification 0 0
Acquisitions 11,827 (122)
Impairments   0
Effect of translation   0
Ending balance 36,317 24,490
Marine Services    
Goodwill [Roll Forward]    
Beginning balance 1,134 1,176
Reclassification 0 0
Acquisitions 1,334 554
Impairments   (540)
Effect of translation   (56)
Ending balance 2,468 1,134
Telecom    
Goodwill [Roll Forward]    
Beginning balance 3,378 3,378
Reclassification 0 0
Acquisitions 0 0
Impairments   0
Effect of translation   0
Ending balance 3,378 3,378
Energy    
Goodwill [Roll Forward]    
Beginning balance 1,374 1,374
Reclassification 0 0
Acquisitions 1,257 0
Impairments   0
Effect of translation   0
Ending balance 2,631 1,374
Insurance    
Goodwill [Roll Forward]    
Beginning balance 29,021 0
Reclassification 0 0
Acquisitions 18,269 29,021
Impairments   0
Effect of translation   0
Ending balance 47,290 29,021
Life Sciences    
Goodwill [Roll Forward]    
Beginning balance 0 0
Reclassification 0 0
Acquisitions 3,620 0
Impairments   0
Effect of translation   0
Ending balance 3,620 0
Other    
Goodwill [Roll Forward]    
Beginning balance 1,781 0
Reclassification (14) 1,781
Acquisitions 587 0
Impairments   0
Effect of translation   0
Ending balance $ 2,382 $ 1,781