Major Customers and Concentration of Credit Risk (Details) - USD ($)
$ in Thousands |
3 Months Ended |
12 Months Ended |
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2014 |
Sep. 30, 2014 |
Jun. 30, 2014 |
Mar. 31, 2014 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
| Concentration Risk [Line Items] |
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| Operating revenue |
$ 26,063
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$ 21,797
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$ 20,395
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$ 13,508
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$ 12,191
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$ 12,986
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$ 5,436
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$ 5,485
|
$ 81,763
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$ 36,098
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$ 26,301
|
| Customer Concentration Risk [Member] | Customer Revenues [Member] | Customer A |
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| Concentration Risk [Line Items] |
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| Operating revenue |
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$ 12,207
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| Concentration risk (as a percentage) |
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14.90%
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| Customer Concentration Risk [Member] | Customer Revenues [Member] | Customer B |
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| Concentration Risk [Line Items] |
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| Operating revenue |
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$ 11,428
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| Concentration risk (as a percentage) |
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14.00%
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| Customer Concentration Risk [Member] | Customer Revenues [Member] | Customer C |
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| Concentration Risk [Line Items] |
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| Operating revenue |
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$ 9,890
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| Concentration risk (as a percentage) |
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12.10%
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| Customer Concentration Risk [Member] | Customer Revenues [Member] | Customer D |
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| Concentration Risk [Line Items] |
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| Operating revenue |
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$ 10,402
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| Concentration risk (as a percentage) |
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12.70%
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| Customer Concentration Risk [Member] | Customer Revenues [Member] | Customer E |
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| Concentration Risk [Line Items] |
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| Operating revenue |
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$ 8,763
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| Concentration risk (as a percentage) |
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10.70%
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| Customer Concentration Risk [Member] | Customer Revenues [Member] | Customer F |
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| Concentration Risk [Line Items] |
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| Operating revenue |
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$ 8,859
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| Concentration risk (as a percentage) |
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10.80%
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| Terminalling services | Customer Concentration Risk [Member] | Customer Revenues [Member] | Customer A |
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| Concentration Risk [Line Items] |
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| Concentration risk (as a percentage) |
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98.00%
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| Terminalling services | Customer Concentration Risk [Member] | Customer Revenues [Member] | Customer B |
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| Concentration Risk [Line Items] |
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| Concentration risk (as a percentage) |
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100.00%
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| Terminalling services | Customer Concentration Risk [Member] | Customer Revenues [Member] | Customer C |
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| Concentration Risk [Line Items] |
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| Concentration risk (as a percentage) |
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90.00%
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| Terminalling services | Customer Concentration Risk [Member] | Customer Revenues [Member] | Customer D |
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| Concentration Risk [Line Items] |
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| Concentration risk (as a percentage) |
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50.00%
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| Terminalling services | Customer Concentration Risk [Member] | Customer Revenues [Member] | Customer E |
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| Concentration Risk [Line Items] |
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| Concentration risk (as a percentage) |
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100.00%
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| Terminalling services | Customer Concentration Risk [Member] | Customer Revenues [Member] | Customer F |
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| Concentration Risk [Line Items] |
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| Concentration risk (as a percentage) |
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0.00%
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| Fleet services | Customer Concentration Risk [Member] | Customer Revenues [Member] | Customer A |
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| Concentration Risk [Line Items] |
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| Concentration risk (as a percentage) |
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2.00%
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| Fleet services | Customer Concentration Risk [Member] | Customer Revenues [Member] | Customer B |
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| Concentration Risk [Line Items] |
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| Concentration risk (as a percentage) |
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0.00%
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| Fleet services | Customer Concentration Risk [Member] | Customer Revenues [Member] | Customer C |
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| Concentration Risk [Line Items] |
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| Concentration risk (as a percentage) |
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10.00%
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| Fleet services | Customer Concentration Risk [Member] | Customer Revenues [Member] | Customer D |
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| Concentration Risk [Line Items] |
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| Concentration risk (as a percentage) |
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50.00%
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| Fleet services | Customer Concentration Risk [Member] | Customer Revenues [Member] | Customer E |
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| Concentration Risk [Line Items] |
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| Concentration risk (as a percentage) |
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0.00%
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| Fleet services | Customer Concentration Risk [Member] | Customer Revenues [Member] | Customer F |
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| Concentration Risk [Line Items] |
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| Concentration risk (as a percentage) |
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100.00%
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