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Commitments and Contingencies (Detail) $ in Millions |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 07, 2015 Plaintiff | Apr. 21, 2015 Plaintiff | Nov. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |
Rental expenses |  |  |  | $ 4.3 | $ 3.7 | $ 3.4
Minimum aggregate rental payments required under operating lease, 2016 |  |  |  | 4.8 |  |
Minimum aggregate rental payments required under operating lease, 2017 |  |  |  | 5.0 |  |
Minimum aggregate rental payments required under operating lease, 2018 |  |  |  | 4.5 |  |
Minimum aggregate rental payments required under operating lease, 2019 |  |  |  | 2.9 |  |
Minimum aggregate rental payments required under operating lease, 2020 |  |  |  | 2.4 |  |
Thereafter |  |  |  | $ 3.2 |  |
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 |  |  | $ 16.5 |  |  |

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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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