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Related Party Transactions (Tables) | 9 Months Ended
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Sep. 30, 2018
Related Party Transactions [Abstract] |
Summary of Accounts Receivable from Related Parties | The following table summarizes accounts receivable from related parties which are included as a component of Accounts receivable on the Company’s Consolidated Balance Sheets:
|  | September 30, 2018 |  |  | December 31, 2017 |
Receivable from WTT |  | $ | 16,057 |  |  | $ | 19,433 |
Receivable from ETFS Issuers |  |  | 7,684 |  |  |  | — |
Receivable from BI and WTI |  |  | 861 |  |  |  | 979 |
Receivable from WTAMC |  |  | 163 |  |  |  | 87 |
Receivable from WTCS |  |  | 100 |  |  |  | 97 |
Total |  | $ | 24,865 |  |  | $ | 20,596 |
Summary of Revenues from Advisory Services Provided to Related Parties | The following table summarizes revenues from advisory services provided to related parties:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Advisory services provided to WTT |  | $ | 49,900 |  |  | $ | 54,439 |  |  | $ | 157,693 |  |  | $ | 158,206 |
Advisory services provided to ETFS Issuers |  |  | 18,442 |  |  |  | — |  |  |  | 36,161 |  |  |  | — |
Advisory services provided to BI and WTI |  |  | 2,532 |  |  |  | 2,452 |  |  |  | 7,883 |  |  |  | 6,498 |
Advisory services provided to WTAMC |  |  | 489 |  |  |  | 92 |  |  |  | 1,204 |  |  |  | 263 |
Advisory services provided to WTCS |  |  | 316 |  |  |  | 310 |  |  |  | 972 |  |  |  | 1,210 |
Total |  | $ | 71,679 |  |  | $ | 57,293 |  |  | $ | 203,913 |  |  | $ | 166,177 |

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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
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- Definition Schedule Of Accounts Receivable From Related Party [Table Text Block] + References No definition available. + Details
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