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Summary of Significant Accounting Policies (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2015 USD ($) Segment | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |
Investment of capital | $ 40.0 |  |
Investment management fees | $ 0.9 | $ 1.6 | $ 1.7
Number of operating segments | Segment | 1 |  |
Fees paid to unaffiliated advisers | $ 76.4 | $ 124.4 | $ 96.1
Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Deferred commissions amortization period | 1 year |  |
Deferred sales charges amortization period | 1 year |  |
Estimated useful lives of intangibles | 1 year |  |
Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Deferred commissions amortization period | 5 years |  |
Deferred sales charges amortization period | 5 years |  |
Estimated useful lives of intangibles | 16 years |  |
Furniture and office equipment [Member] | Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of furniture, equipment and leasehold improvements, net | 3 years |  |
Furniture and office equipment [Member] | Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of furniture, equipment and leasehold improvements, net | 7 years |  |
Computer equipment and software [Member] | Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of furniture, equipment and leasehold improvements, net | 3 years |  |
Computer equipment and software [Member] | Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of furniture, equipment and leasehold improvements, net | 5 years |  |

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- Definition The cash outflow associated with the acquisition of a controlling interest in another entity or an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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