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Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2018
Accounting Policies [Abstract] |
Summary of Reclassifications to Conform to the Current Year's Consolidated Financial Statement Presentation | The following table summarizes these reclassifications for the three and nine months ended September 30, 2017, which had no effect on previously reported net income.
Operating Revenues: |  | Three Months Ended September 30, 2017 |  |  | Nine Months Ended September 30, 2017 |
Advisory fees (previously reported) |  | $ | 57,574 |  |  | $ | 166,950 |
Other ETP fees reclassified to Other income |  |  | (281 | ) |  |  | (773 | )
Advisory fees (currently reported) |  | $ | 57,293 |  |  | $ | 166,177 |
Settlement gain (previously reported) |  | $ | — |  |  | $ | 6,909 |
Reclassify to Other Income/(Expenses) |  |  | — |  |  |  | (6,909 | )
Settlement gain (currently reported) |  | $ | — |  |  | $ | — |
Other income (previously reported) |  | $ | 412 |  |  | $ | 2,154 |
Other ETP fees reclassified from Advisory fees |  |  | 281 |  |  |  | 773 |
Interest income reclassified to Other Income/(Expenses) |  |  | (772 | ) |  |  | (1,999 | )
Realized and unrealized losses reclassified to Other gains and losses, net |  |  | 535 |  |  |  | 1,054 |
Miscellaneous other income reclassified to Other gains and losses, net |  |  | (35 | ) |  |  | (837 | )
Other income (currently reported) |  | $ | 421 |  |  | $ | 1,145 |
Total revenues (currently reported) |  | $ | 57,714 |  |  | $ | 167,322 |
Other Income/(Expenses): |  |  |  |  |  |  |  |
Interest income reclassified from operating revenues |  | $ | 772 |  |  | $ | 1,999 |
Settlement gain reclassified from operating revenues |  | $ | — |  |  | $ | 6,909 |
Other gains and losses, net (previously reported) |  | $ | — |  |  | $ | — |
Realized and unrealized losses reclassified from operating revenues |  |  | (535 | ) |  |  | (1,054 | )
Miscellaneous other income reclassified from operating revenues |  |  | 35 |  |  |  | 837 |
Other gains and losses, net (currently reported) |  | $ | (500 | ) |  | $ | (217 | )
Schedule of Estimated Useful Lives of Related Assets | Depreciation is provided for using the straight-line method over the estimated useful lives of the related assets as follows:
Equipment |  |  | 5 years |
Furniture and fixtures |  |  | 15 years |

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