Inventories (Tables)
 12 Months Ended
Dec. 31, 2015
Inventory Disclosure [Abstract]  
Schedule of Inventories
 
As of December 31,
 
2015
 
2014
Petroleum and related products
$
215,048

 
$
366,431

Asphalt
20,677

 
18,357

Coal
3,713

 
2,380

Natural gas
1,882

 
3,387

Inventories
$
241,320

 
$
390,555