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Consolidated Sponsored Investment Products - Balances of Consolidated Sponsored Investment Products (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2013
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Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Total cash and cash equivalents | $ 128,847 | $ 203,304 | $ 173,764 | $ 271,545
Total investments | 55,225 | 63,448 |  |
Total liabilities | (237,538) | (112,350) |  |
Redeemable noncontrolling interests | (49,895) | (23,071) |  |
Consolidated Sponsored Investment Products [Member] |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Total cash and cash equivalents | 16,732 | 8,687 |  |
Total investments | 311,429 | 236,652 |  |
All other assets | 10,494 | 6,960 |  |
Total liabilities | (29,849) | (12,556) |  |
Redeemable noncontrolling interests | (49,895) | (23,071) |  |
The Company’s net interests in investment products | $ 258,911 | $ 216,672 |  |
The Company's net interest as a percentage of total investments of investment products | 83.10% | 91.60% |  |

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