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Consolidated Sponsored Investment Products - Condensed Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Condensed Financial Statements, Captions [Line Items] |  |
Total cash | $ 166,031 us-gaap_CashEquivalentsAtCarryingValue | $ 202,847 us-gaap_CashEquivalentsAtCarryingValue
Total investments | 56,995 us-gaap_Investments | 63,448 us-gaap_Investments
All other assets | 17,092 us-gaap_OtherAssets | 16,060 us-gaap_OtherAssets
Total assets | 680,374 us-gaap_Assets | 698,773 us-gaap_Assets
Total liabilities | 80,253 us-gaap_Liabilities | 112,350 us-gaap_Liabilities
Redeemable noncontrolling interest | 34,977 us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests | 23,071 us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests
Equity attributable to stockholders of the Company | 565,368 us-gaap_StockholdersEquity | 563,542 us-gaap_StockholdersEquity
Non-redeemable noncontrolling interest | (224)us-gaap_MinorityInterest | (190)us-gaap_MinorityInterest
Total liabilities and equity | 680,374 us-gaap_LiabilitiesAndStockholdersEquity | 698,773 us-gaap_LiabilitiesAndStockholdersEquity
Balances as Reported in Consolidated Balance Sheet [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Total cash | 177,643 us-gaap_CashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 211,534 us-gaap_CashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Total investments | 311,476 us-gaap_Investments / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 300,100 us-gaap_Investments / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
All other assets | 191,255 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 187,139 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Total assets | 680,374 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 698,773 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Total liabilities | 80,253 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 112,350 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Redeemable noncontrolling interest | 34,977 us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 23,071 us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Equity attributable to stockholders of the Company | 565,368 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 563,542 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Non-redeemable noncontrolling interest | (224)us-gaap_MinorityInterest / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | (190)us-gaap_MinorityInterest / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Total liabilities and equity | 680,374 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 698,773 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Reportable Legal Entities [Member] | Balance Before Consolidation of Investment Products [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Total cash | 166,031 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 202,847 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total investments | 277,471 us-gaap_Investments / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 279,863 us-gaap_Investments / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
All other assets | 185,404 us-gaap_OtherAssets / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 180,436 us-gaap_OtherAssets / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total assets | 628,906 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 663,146 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total liabilities | 63,762 us-gaap_Liabilities / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 99,794 us-gaap_Liabilities / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Redeemable noncontrolling interest | 0 us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Equity attributable to stockholders of the Company | 565,368 us-gaap_StockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 563,542 us-gaap_StockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Non-redeemable noncontrolling interest | (224)us-gaap_MinorityInterest / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (190)us-gaap_MinorityInterest / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total liabilities and equity | 628,906 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 663,146 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Reportable Legal Entities [Member] | Consolidated Sponsored Investment Products [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Total cash | 11,612 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 8,687 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Total investments | 254,481 us-gaap_Investments / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 236,652 us-gaap_Investments / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
All other assets | 8,629 us-gaap_OtherAssets / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 6,960 us-gaap_OtherAssets / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Total assets | 274,722 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 252,299 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Total liabilities | 19,269 us-gaap_Liabilities / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 12,813 us-gaap_Liabilities / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Redeemable noncontrolling interest | 0 us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Equity attributable to stockholders of the Company | 255,453 us-gaap_StockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 239,486 us-gaap_StockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Non-redeemable noncontrolling interest | 0 us-gaap_MinorityInterest / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Total liabilities and equity | 274,722 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 252,299 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Eliminations and Adjustments [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Total cash | 0 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |
Total investments | (220,476)us-gaap_Investments / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (216,415)us-gaap_Investments / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
All other assets | (2,778)us-gaap_OtherAssets / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (257)us-gaap_OtherAssets / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Total assets | (223,254)us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (216,672)us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Total liabilities | (2,778)us-gaap_Liabilities / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (257)us-gaap_Liabilities / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Redeemable noncontrolling interest | 34,977 us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | 23,071 us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Equity attributable to stockholders of the Company | (255,453)us-gaap_StockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (239,486)us-gaap_StockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Non-redeemable noncontrolling interest | 0 us-gaap_MinorityInterest / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |
Total liabilities and equity | $ (223,254)us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | $ (216,672)us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember

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