Annual report pursuant to Section 13 and 15(d)

Business Acquisitions - Narrative (Details)

v3.19.3.a.u2
Business Acquisitions - Narrative (Details)
$ in Thousands
12 Months Ended
Jun. 01, 2018
USD ($)
Mar. 01, 2018
USD ($)
numberOfInstallments
Jul. 03, 2017
USD ($)
vessel
Dec. 31, 2018
USD ($)
vessel
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]          
Business combination, long-term debt assumed       $ 0 $ 28,725
Cleancor          
Business Acquisition [Line Items]          
Business acquisition, percentage of voting interests acquired 50.00%        
Payments to acquire businesses, gross $ 3,200        
Partners' capital account, contributions $ 1,900        
SCA          
Business Acquisition [Line Items]          
Payments to acquire businesses, gross   $ 1,500      
Business combination, number of installments | numberOfInstallments   2      
Business combination, contingent consideration   $ 900      
ISH          
Business Acquisition [Line Items]          
Payments to acquire businesses, gross     $ 10,500    
Business combination, note receivable contributed     18,100    
Business combination, long-term debt assumed     $ 28,700    
PCTC's | ISH          
Business Acquisition [Line Items]          
Number of equipment acquired | vessel     4    
Bulk carriers - U.S.-flag | ISH          
Business Acquisition [Line Items]          
Number of equipment acquired | vessel     2 2  
Rail ferries - Foreign-flag | ISH          
Business Acquisition [Line Items]          
Number of equipment acquired | vessel     2