Organization - Additional Information (Details) |
12 Months Ended |
|---|---|
Dec. 31, 2017 | |
| General Partner | |
| Subsidiary of Limited Liability Company or Limited Partnership [Line Items] | |
| Percentage ownership of operating partnership | 1.00% |
| Limited Partner | |
| Subsidiary of Limited Liability Company or Limited Partnership [Line Items] | |
| Percentage ownership of operating partnership | 99.00% |