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Consolidated 50% Owned Subsidiaries, including Variable Interest Entities ("VIE") Consolidated 50% Owned Subsidiaries, including Variable Interest Entities - Balance Sheet Information (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]        
Cash and cash equivalents $ 66,585 $ 83,953 $ 60,058 $ 42,785
Receivables, including retainage 164,465 133,931    
Other current assets 9,066 7,529    
Total current assets 289,883 278,526    
Property and equipment, net 51,726 54,406    
Goodwill 85,231 85,231    
Total assets 470,685 463,298    
Accounts payable 96,384 97,457    
Other current liabilities 7,063 9,348    
Total current liabilities 175,761 182,292    
Other long-term liabilities 1,246 1,271    
Variable Interest Entity, Primary Beneficiary        
Schedule of Equity Method Investments [Line Items]        
Cash and cash equivalents 0 8,590    
Receivables, including retainage 27,557 26,844    
Other current assets 11,629 15,672    
Total current assets 39,186 51,106    
Property and equipment, net 8,107 9,001    
Goodwill 1,501 1,501    
Total assets 48,794 61,608    
Accounts payable 21,753 28,448    
Other current liabilities 9,715 11,798    
Total current liabilities 31,468 40,246    
Other long-term liabilities 104 3,491    
Total liabilities $ 31,572 $ 43,737