Major Customers and Concentration of Credit Risk (Tables)
 12 Months Ended
Dec. 31, 2015
Risks and Uncertainties [Abstract]  
Schedule of Revenue Attributable to Major Customers
The following table provides the percentage of total revenues attributable to a single customer from which 10% or more of total revenues are derived:
 
Total Revenues by Major Customer
(in thousands)
 
Percentage of Total Company Revenues
 
Percentage of Customer Revenues in Terminalling Services Segment
 
Percentage of Customer Revenues in Fleet Services Segment
Customer A
$
12,207

 
14.9
%
 
98
%
 
2
%
Customer B
$
11,428

 
14.0
%
 
100
%
 
0
%
Customer C
$
9,890

 
12.1
%
 
90
%
 
10
%
Customer D
$
10,402

 
12.7
%
 
50
%
 
50
%
Customer E
$
8,763

 
10.7
%
 
100
%
 
0
%
Customer F
$
8,859

 
10.8
%
 
0
%
 
100
%