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Business Combinations (Detail) $ in Thousands |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 10, 2015 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  | $ 6,788 | $ 6,701 | $ 5,260 | $ 5,260
Redeemable noncontrolling interest, EBITDA multiplier for redemption |  |  | 6 |  |  |
Redeemable noncontrolling interest, redemption liability |  |  | $ 3,500 |  |  |
Virtus ETF Solutions [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Minority shareholders ownership percentage |  |  | 42.50% |  |  |
Virtus ETF Solutions [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price | $ 4,800 |  |  |  |  |
Goodwill | 1,500 |  |  |  |  |
Other intangible assets | $ 2,400 |  |  |  |  |
RidgeWorth Holdings, LLC [Member] | Forecast [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price |  | $ 472,000 |  |  |  |

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