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Consolidation - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Assets |  |
Cash equivalents | $ 28,617 | $ 54,772
Total assets measured at fair value | 113,441 | 101,578
Level 1 [Member] |  |
Assets |  |
Cash equivalents | 28,617 | 54,772
Total assets measured at fair value | 113,441 | 101,578
Level 2 [Member] |  |
Assets |  |
Cash equivalents | 0 | 0
Total assets measured at fair value | 0 | 0
Level 3 [Member] |  |
Assets |  |
Cash equivalents | 0 | 0
Total assets measured at fair value | 0 | 0
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivatives | 64 | 771
Total assets measured at fair value | 199,694 | 324,106
Liabilities |  |
Derivatives | 81 | 972
Short sales | 1,495 | 5,409
Total liabilities measured at fair value | 1,576 | 6,381
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] |  |
Assets |  |
Investments | 125,018 | 152,553
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] |  |
Assets |  |
Investments | 74,612 | 170,782
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |
Assets |  |
Derivatives | 33 | 33
Total assets measured at fair value | 74,302 | 163,019
Liabilities |  |
Derivatives | 0 | 128
Short sales | 1,495 | 5,334
Total liabilities measured at fair value | 1,495 | 5,462
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Debt Securities [Member] |  |
Assets |  |
Investments | 0 | 0
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Equity Securities [Member] |  |
Assets |  |
Investments | 74,269 | 162,986
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |
Assets |  |
Derivatives | 31 | 738
Total assets measured at fair value | 124,396 | 159,690
Liabilities |  |
Derivatives | 81 | 844
Short sales | 0 | 75
Total liabilities measured at fair value | 81 | 919
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Debt Securities [Member] |  |
Assets |  |
Investments | 124,341 | 151,156
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Equity Securities [Member] |  |
Assets |  |
Investments | 24 | 7,796
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |
Assets |  |
Derivatives | 0 | 0
Total assets measured at fair value | 996 | 1,397
Liabilities |  |
Derivatives | 0 | 0
Short sales | 0 | 0
Total liabilities measured at fair value | 0 | 0
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Debt Securities [Member] |  |
Assets |  |
Investments | 677 | 1,397
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Equity Securities [Member] |  |
Assets |  |
Investments | 319 | 0
Consolidated Investment Product [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Cash equivalents | 7,440 | 8,297
Investments | 193,663 | 199,485
Total assets measured at fair value | 201,103 | 207,782
Consolidated Investment Product [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |
Assets |  |
Cash equivalents | 7,440 | 8,297
Investments | 0 | 0
Total assets measured at fair value | 7,440 | 8,297
Consolidated Investment Product [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |
Assets |  |
Cash equivalents | 0 | 0
Investments | 193,663 | 199,485
Total assets measured at fair value | 193,663 | 199,485
Consolidated Investment Product [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |
Assets |  |
Cash equivalents | 0 | 0
Investments | 0 | 0
Total assets measured at fair value | $ 0 | $ 0

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