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Consolidation - Condensed Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |  |
Total liabilities | $ (465,449) | $ (276,408) |  |
Redeemable noncontrolling interests | (37,266) | (73,864) | $ (23,071) | $ (42,186)
Consolidated Sponsored Investment Products [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total cash | 3,650 | 1,513 |  |
Total investments | 142,075 | 323,335 |  |
All other assets | 3,270 | 8,549 |  |
Total liabilities | (4,109) | (15,387) |  |
Consolidated Sponsored Investment Products [Member] | Consolidated Sponsored Investment Products - VOEs [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total cash | 1,859 | 11,408 |  |
Total investments | 99,247 | 291,247 |  |
All other assets | 2,211 | 8,281 |  |
Total liabilities | (2,310) | (14,948) |  |
Redeemable noncontrolling interests | (12,505) | (61,236) |  |
The Company’s net interests in consolidated sponsored investment products | 88,502 | 234,752 |  |
Consolidated Sponsored Investment Products [Member] | Consolidated Sponsored Investment Product - VIE [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total cash | 2,775 | 458 |  |
Total investments | 42,828 | 32,088 |  |
All other assets | 1,059 | 268 |  |
Total liabilities | (1,799) | (439) |  |
Redeemable noncontrolling interests | (24,761) | (12,628) |  |
The Company’s net interests in consolidated sponsored investment products | 20,102 | 19,747 |  |
Consolidated Investment Product [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total cash equivalents | 14,449 | 8,297 |  |
Total investments | 346,967 | 199,485 |  |
All other assets | 5,888 | 1,467 |  |
Debt | 0 | (152,597) |  |
Notes payable | (328,761) | 0 |  |
Securities purchased payable and other liabilities | (12,534) | (18,487) |  |
The Company’s net interests in consolidated sponsored investment products | $ 26,009 | $ 38,165 |  |

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