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LONG-TERM OBLIGATIONS, Credit Agreements of Acquired Entities (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Oct. 21, 2014
Sep. 22, 2014
May. 06, 2014
Jan. 31, 2014
Oct. 30, 2013
Jun. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Jun. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]                      
Borrowings           $ 388,992,000       $ 388,992,000  
Schuff International, Inc [Member] | International LOC [Member]                      
Debt Instrument [Line Items]                      
Line of credit, maximum amount           2,500,000       $ 2,500,000  
September Credit Facility [Member] | Novatel Wireless, Inc. [Member]                      
Debt Instrument [Line Items]                      
Write-off of deferred financing cost             $ 500,000        
Write-off of original issue discount             4,500,000        
Net of credit for previous paid funding fees             2,300,000        
Credit Facility [Member] | Schuff International, Inc [Member]                      
Debt Instrument [Line Items]                      
Credit agreement interest rate (in hundredths)                   3.27% 3.00%
Line of credit, maximum amount           50,000,000       $ 50,000,000  
Borrowings           0 0     0 $ 0
Extended maturity date     Apr. 30, 2019                
Line of credit outstanding amount           0 0     0 0
Credit Facility [Member] | Schuff International, Inc [Member] | International LOC [Member]                      
Debt Instrument [Line Items]                      
Borrowings           1,300,000       1,300,000  
Letter of Credit [Member] | Schuff International, Inc [Member]                      
Debt Instrument [Line Items]                      
Line of credit borrowings           46,100,000       46,100,000  
Line of credit outstanding amount           3,900,000       3,900,000  
Letter of Credit [Member] | Schuff International, Inc [Member] | International LOC [Member]                      
Debt Instrument [Line Items]                      
Line of credit borrowings           1,200,000       1,200,000  
Line of credit outstanding amount           0       0  
Note Payable Collateralized by Assets [Member] | Global Marine Systems Limited [Member]                      
Debt Instrument [Line Items]                      
Borrowings           14,531,000 16,372,000     14,531,000 16,372,000
Note Payable Collateralized by Assets [Member] | American Natural Gas [Member]                      
Debt Instrument [Line Items]                      
Borrowings           736,000 810,000     736,000 810,000
Note Payable Collateralized By Equipment [Member] | Schuff International, Inc [Member]                      
Debt Instrument [Line Items]                      
Borrowings           11,690,000 8,333,000     11,690,000 8,333,000
Note Payable Collateralized By Equipment [Member] | Credit Facility [Member] | Schuff International, Inc [Member]                      
Debt Instrument [Line Items]                      
Proceeds from note payable collaterized $ 10,000,000                    
Note Payable Collateralized by Real Estate [Member] | Schuff International, Inc [Member]                      
Debt Instrument [Line Items]                      
Borrowings           4,323,000 4,635,000     4,323,000 4,635,000
Note Payable Collateralized by Real Estate [Member] | Credit Facility [Member] | Schuff International, Inc [Member]                      
Debt Instrument [Line Items]                      
Proceeds from note payable collaterized     $ 5,000,000                
Real Estate Term Advance [Member] | Schuff International, Inc [Member]                      
Debt Instrument [Line Items]                      
Borrowings           4,300,000 4,600,000     $ 4,300,000 $ 4,600,000
Debt instrument term                   5 years 5 years
Real Estate Term Advance [Member] | Credit Facility [Member] | Schuff International, Inc [Member]                      
Debt Instrument [Line Items]                      
Borrowings           $ 11,700,000 8,400,000     $ 11,700,000 $ 8,400,000
Debt instrument term           5 years         5 years
Real Estate Term Advance [Member] | Note Payable Collateralized by Real Estate [Member] | Credit Facility [Member] | Schuff International, Inc [Member]                      
Debt Instrument [Line Items]                      
Proceeds from note payable collaterized $ 5,000,000                    
Term Loan [Member] | Global Marine Systems Limited [Member]                      
Debt Instrument [Line Items]                      
Borrowings           $ 14,500,000 16,700,000     14,500,000 $ 16,700,000
Term Loan [Member] | American Natural Gas [Member]                      
Debt Instrument [Line Items]                      
Borrowings           $ 700,000 $ 800,000     $ 700,000 $ 800,000
Debt instrument term         5 years            
Term Loan [Member] | LIBOR [Member] | Global Marine Systems Limited [Member]                      
Debt Instrument [Line Items]                      
Debt instrument term       4 years 6 months              
Term Loan [Member] | May Credit Facility [Member]                      
Debt Instrument [Line Items]                      
Debt instrument term                     18 months
Term Loan [Member] | September Credit Facility [Member]                      
Debt Instrument [Line Items]                      
Debt instrument term   12 months                  
Partial Prepayments [Member] | May Credit Facility [Member]                      
Debt Instrument [Line Items]                      
Write-off of deferred financing cost               $ 100,000 $ 100,000    
Write-off of original issue discount               1,900,000 $ 200,000    
Payoff of Remaining Balance [Member] | May Credit Facility [Member]                      
Debt Instrument [Line Items]                      
Premiums and other costs               900,000      
Write-off of deferred financing cost               300,000      
Write-off of original issue discount               2,500,000      
Payoff of Remaining Balance [Member] | May Credit Facility [Member] | Novatel Wireless, Inc. [Member]                      
Debt Instrument [Line Items]                      
Write-off of deferred financing cost               400,000      
Write-off of original issue discount               $ 800,000