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Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests - Balance sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current assets:        
Cash and cash equivalents $ 83,953 $ 42,785 $ 4,426 $ 22,843
Receivables, including retainage 133,931 84,132    
Other current assets 7,529 5,448    
Total current assets 278,526 175,908    
Property and equipment, net 54,406 68,127    
Goodwill 85,231 54,820    
Total assets 463,298 301,823    
Current liabilities:        
Accounts payable 97,457 67,097    
Total current liabilities 182,292 146,592    
Variable Interest Entity, Primary Beneficiary        
Current assets:        
Cash and cash equivalents 8,590 9,655    
Receivables, including retainage 26,844 15,046    
Other current assets 15,672 10,208    
Total current assets 51,106 34,909    
Property and equipment, net 9,001 9,824    
Goodwill 1,501 1,501    
Total assets 61,608 46,234    
Current liabilities:        
Accounts payable 28,448 21,274    
Other current liabilities 11,798 8,782    
Total current liabilities 40,246 30,056    
Long-term liabilities:        
Other long-term liabilities 3,491 5,373    
Total liabilities $ 43,737 $ 35,429