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ACQUISITIONS (Details)
 1 Months Ended 9 Months Ended
Sep. 13, 2017
USD ($)
Branch
State
$ / shares
shares
Jul. 10, 2017
USD ($)
Vessel
bbl
hp
Jun. 26, 2017
USD ($)
Jul. 31, 2017
USD ($)
Vessel
Sep. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Assets [Abstract]            
Goodwill         $ 919,276,000 $ 598,131,000
Stewart & Stevenson LLC [Member]            
Business Acquisition [Line Items]            
Purchase price before post-closing adjustment and transaction fees $ 758,245,000          
Assumption of debt $ 13,724,000          
Issuance of shares (in shares) | shares 5,696,259          
Price per share (in dollars per share) | $ / shares $ 64.35          
Assumption of debt of seller $ 12,135,000          
Interest rate 4.00%          
Quarterly principle payment amount $ 375,000          
Principle amount due through maturity $ 99,000          
Number of branches | Branch 42          
Number of states having branches | State 12          
Total consideration transferred [Abstract]            
Cash paid for acquisition $ 377,967,000          
Stock consideration through issuance of Company common stock 366,554,000          
Fair value of consideration transferred 744,521,000          
Assets [Abstract]            
Cash 98,000          
Accounts receivable 97,891,000          
Inventories 150,000,000          
Prepaid expenses and other current assets 3,850,000          
Property and equipment 150,652,000          
Goodwill 317,861,000          
Other assets 163,230,000          
Total assets 883,582,000          
Liabilities [Abstract]            
Current portion of long-term debt 1,501,000          
Bank notes payable 1,589,000          
Income taxes payable 850,000          
Accounts payable 72,200,000          
Accrued liabilities 31,803,000          
Deferred revenues 18,806,000          
Long-term debt 10,634,000          
Other long-term liabilities 1,678,000          
Total liabilities 139,061,000          
Net assets acquired 744,521,000          
Intangible assets acquired 160,822,000          
Weighted average amortization period of intangibles         16 years 9 months 18 days  
Acquisition related costs $ 1,471,000          
Stewart & Stevenson LLC [Member] | Revolving Credit Facility [Member]            
Business Acquisition [Line Items]            
Maximum borrowing capacity     $ 850,000,000     $ 550,000,000
Maturity date     Jun. 26, 2022      
Undisclosed Competitor [Member]            
Total consideration transferred [Abstract]            
Cash paid for acquisition   $ 68,000,000        
Assets [Abstract]            
Goodwill   67,970,000        
Liabilities [Abstract]            
Intangible assets acquired   $ 30,000        
Weighted average amortization period of intangibles         2 years  
Undisclosed Competitor [Member] | Pressure Tank Barges [Member]            
Liabilities [Abstract]            
Number of maritime vessels acquired | Vessel   9        
Undisclosed Competitor [Member] | Barrel Tank Barges [Member]            
Liabilities [Abstract]            
Number of maritime vessels acquired | Vessel   4        
Tank barge barrel capacity | bbl   30,000        
Undisclosed Competitor [Member] | Inland Towboats [Member]            
Liabilities [Abstract]            
Number of maritime vessels acquired | Vessel   3        
Horsepower of inland towboats | hp   1,320        
Undisclosed Competitor [Member] | Inland Tank Barges [Member]            
Liabilities [Abstract]            
Number of maritime vessels acquired | Vessel   13        
Average age of property         5 years  
Barge Fleeting and Marine Fueling Operation Business [Member]            
Total consideration transferred [Abstract]            
Fair value of consideration transferred       $ 3,900,000    
Barge Fleeting and Marine Fueling Operation Business [Member] | Inland Tank Barges [Member]            
Total consideration transferred [Abstract]            
Fair value of consideration transferred       $ 1,450,000    
Liabilities [Abstract]            
Number of maritime vessels acquired | Vessel       4