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Commitments and Contingencies - Additional Information (Detail) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jun. 07, 2015 Plaintiff | Apr. 21, 2015 Plaintiff | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss contingency, income tax benefit |  |  | $ (9,669) | $ 1,805 | $ (28,360) | $ (24,311)
Virtus Investment Partners, Inc. Securities Litigation [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of plaintiffs | Plaintiff |  | 3 |  |  |  |
Mark Youngers v. Virtus Investment Partners, Inc. et al [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of plaintiffs | Plaintiff | 3 |  |  |  |  |
Unfavorable Regulatory Action [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss contingency, pre-tax |  |  |  |  | 16,500 |
Loss contingency, income tax benefit |  |  |  |  | 5,500 |
Loss contingency, net of tax benefit |  |  |  |  | $ 11,000 |

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