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Subsequent Events - Additional Information (Detail) - USD ($) $ in Thousands | Apr. 27, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Nov. 18, 2016
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Subsequent Event [Line Items] |  |  |  |
Cost method investments |  | $ 20,000 | $ 20,000 |
Advisor Engine Inc. [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Cost method investments |  |  |  | $ 20,000
Ownership interest percentage |  | 42.00% |  |
Fully diluted ownership interest percentage |  | 36.00% |  |
Advisor Engine Inc. [Member] | Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Cost method investments | $ 5,000 |  |  |
Ownership interest percentage | 47.00% |  |  |
Fully diluted ownership interest percentage | 41.00% |  |  |
Advisor Engine Inc. [Member] | Series A- One Convertible Preferred Stock [Member] | Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of shares received | 2,646,062 |  |  |

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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