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Consolidated Sponsored Investment Products - Summary of Assets Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
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Mar. 31, 2014
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Dec. 31, 2013
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| Fair Value Inputs, Assets, Quantitative Information [Line Items] |
|
|
| Total Investments of Consolidated Sponsored Investment Products at Fair Value |
$ 62,086 |
$ 139,054 |
|
Debt Securities [Member]
|
|
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| Fair Value Inputs, Assets, Quantitative Information [Line Items] |
|
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| Total Investments of Consolidated Sponsored Investment Products at Fair Value |
52,925 |
47,114 |
|
Equity Securities [Member]
|
|
|
| Fair Value Inputs, Assets, Quantitative Information [Line Items] |
|
|
| Total Investments of Consolidated Sponsored Investment Products at Fair Value |
9,161 |
91,940 |
|
Level 1 [Member]
|
|
|
| Fair Value Inputs, Assets, Quantitative Information [Line Items] |
|
|
| Total Investments of Consolidated Sponsored Investment Products at Fair Value |
9,161 |
91,940 |
|
Level 1 [Member] | Debt Securities [Member]
|
|
|
| Fair Value Inputs, Assets, Quantitative Information [Line Items] |
|
|
| Total Investments of Consolidated Sponsored Investment Products at Fair Value |
0 |
|
|
Level 1 [Member] | Equity Securities [Member]
|
|
|
| Fair Value Inputs, Assets, Quantitative Information [Line Items] |
|
|
| Total Investments of Consolidated Sponsored Investment Products at Fair Value |
9,161 |
91,940 |
|
Level 2 [Member]
|
|
|
| Fair Value Inputs, Assets, Quantitative Information [Line Items] |
|
|
| Total Investments of Consolidated Sponsored Investment Products at Fair Value |
52,925 |
47,114 |
|
Level 2 [Member] | Debt Securities [Member]
|
|
|
| Fair Value Inputs, Assets, Quantitative Information [Line Items] |
|
|
| Total Investments of Consolidated Sponsored Investment Products at Fair Value |
52,925 |
47,114 |
|
Level 2 [Member] | Equity Securities [Member]
|
|
|
| Fair Value Inputs, Assets, Quantitative Information [Line Items] |
|
|
| Total Investments of Consolidated Sponsored Investment Products at Fair Value |
0 |
|
|
Level 3 [Member]
|
|
|
| Fair Value Inputs, Assets, Quantitative Information [Line Items] |
|
|
| Total Investments of Consolidated Sponsored Investment Products at Fair Value |
0 |
|
|
Level 3 [Member] | Debt Securities [Member]
|
|
|
| Fair Value Inputs, Assets, Quantitative Information [Line Items] |
|
|
| Total Investments of Consolidated Sponsored Investment Products at Fair Value |
0 |
|
|
Level 3 [Member] | Equity Securities [Member]
|
|
|
| Fair Value Inputs, Assets, Quantitative Information [Line Items] |
|
|
| Total Investments of Consolidated Sponsored Investment Products at Fair Value |
$ 0 |
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