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Summary of Significant Accounting Policies (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($) Segment | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of operating segments | Segment | 1 |  |
Fees paid to unaffiliated advisers | $ 47.2 | $ 76.4 | $ 124.4
Comprehensive income (loss), net of tax, equity investments | $ 0.2 | $ (0.4) |
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 and equipment | 3 years |  |
Furniture and office equipment [Member] | Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of furniture and equipment | 7 years |  |
Computer equipment and software [Member] | Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of furniture and equipment | 3 years |  |
Computer equipment and software [Member] | Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of furniture and equipment | 5 years |  |

X
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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 Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 + Details
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- Details
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