Summary of Significant Accounting Policies - Amortization Periods (Table) (Details) |
12 Months Ended |
|---|---|
Dec. 31, 2017 | |
| Trade name | |
| Acquired Finite Lived Intangible Assets | |
| Weighted average amortization periods | 30 years |
| Favorable lease terms | |
| Acquired Finite Lived Intangible Assets | |
| Weighted average amortization periods | 8 years |
| Port terminal operating rights | |
| Acquired Finite Lived Intangible Assets | |
| Weighted average amortization periods | 47 years |
| Customer relationships | |
| Acquired Finite Lived Intangible Assets | |
| Weighted average amortization periods | 20 years |