Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Commitments and Contingencies - Additional Information (Detail) - Plaintiff	Jun. 07, 2015	Apr. 21, 2015
Virtus Investment Partners, Inc. Securities Litigation [Member]
Loss Contingencies [Line Items]
Number of plaintiffs		3
Mark Youngers v. Virtus Investment Partners, Inc. et al [Member]
Loss Contingencies [Line Items]
Number of plaintiffs	3