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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
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]        
Cash and cash equivalents $ 55,462 $ 83,953 $ 37,147 $ 42,785
Receivables, including retainage 140,877 133,931    
Other current assets 6,479 7,529    
Total current assets 257,179 278,526    
Property and equipment, net 52,142 54,406    
Goodwill 85,231 85,231    
Total assets 439,035 463,298    
Accounts payable 85,123 97,457    
Other current liabilities 8,519 9,348    
Total current liabilities 158,462 182,292    
Other long-term liabilities 1,252 1,271    
Variable Interest Entity, Primary Beneficiary        
Schedule of Equity Method Investments [Line Items]        
Cash and cash equivalents 2,061 8,590    
Receivables, including retainage 21,507 26,844    
Other current assets 13,634 15,672    
Total current assets 37,202 51,106    
Property and equipment, net 8,528 9,001    
Goodwill 1,501 1,501    
Total assets 47,231 61,608    
Accounts payable 20,478 28,448    
Other current liabilities 9,557 11,798    
Total current liabilities 30,035 40,246    
Other long-term liabilities 160 3,491    
Total liabilities $ 30,195 $ 43,737