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Consolidated Sponsored Investment Products - Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Condensed Financial Statements, Captions [Line Items] |  |
Total cash | $ 202,847 us-gaap_CashEquivalentsAtCarryingValue | $ 271,014 us-gaap_CashEquivalentsAtCarryingValue
Total investments | 63,448 us-gaap_Investments | 37,258 us-gaap_Investments
All other assets | 16,060 us-gaap_OtherAssets | 15,724 us-gaap_OtherAssets
Total assets | 698,773 us-gaap_Assets | 644,954 us-gaap_Assets
Total liabilities | 112,350 us-gaap_Liabilities | 109,900 us-gaap_Liabilities
Redeemable noncontrolling interest | 23,071 us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests | 42,186 us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests
Equity attributable to stockholders of the Company | 563,542 us-gaap_StockholdersEquity | 492,930 us-gaap_StockholdersEquity
Non-redeemable noncontrolling interest | (190)us-gaap_MinorityInterest | (62)us-gaap_MinorityInterest
Total liabilities and equity | 698,773 us-gaap_LiabilitiesAndStockholdersEquity | 644,954 us-gaap_LiabilitiesAndStockholdersEquity
Balances as Reported in Consolidated Balance Sheet [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Total cash | 211,534 us-gaap_CashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 271,545 us-gaap_CashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Total investments | 300,100 us-gaap_Investments / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 176,312 us-gaap_Investments / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
All other assets | 187,139 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 197,097 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Total assets | 698,773 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 644,954 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Total liabilities | 112,350 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 109,900 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Redeemable noncontrolling interest | 23,071 us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 42,186 us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Equity attributable to stockholders of the Company | 563,542 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 492,930 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Non-redeemable noncontrolling interest | (190)us-gaap_MinorityInterest / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | (62)us-gaap_MinorityInterest / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Total liabilities and equity | 698,773 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 644,954 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 | 202,847 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 271,014 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total investments | 279,863 us-gaap_Investments / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 135,692 us-gaap_Investments / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
All other assets | 180,436 us-gaap_OtherAssets / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 187,627 us-gaap_OtherAssets / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total assets | 663,146 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 594,333 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total liabilities | 99,794 us-gaap_Liabilities / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 101,465 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 | 563,542 us-gaap_StockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 492,930 us-gaap_StockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Non-redeemable noncontrolling interest | (190)us-gaap_MinorityInterest / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (62)us-gaap_MinorityInterest / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total liabilities and equity | 663,146 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 594,333 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 | 8,687 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 531 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Total investments | 236,652 us-gaap_Investments / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 139,054 us-gaap_Investments / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
All other assets | 6,960 us-gaap_OtherAssets / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 9,595 us-gaap_OtherAssets / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Total assets | 252,299 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 149,180 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Total liabilities | 12,813 us-gaap_Liabilities / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 8,560 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 | 239,486 us-gaap_StockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 140,620 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 | 252,299 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 149,180 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 | (216,415)us-gaap_Investments / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (98,434)us-gaap_Investments / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
All other assets | (257)us-gaap_OtherAssets / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (125)us-gaap_OtherAssets / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Total assets | (216,672)us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (98,559)us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Total liabilities | (257)us-gaap_Liabilities / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (125)us-gaap_Liabilities / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Redeemable noncontrolling interest | 23,071 us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | 42,186 us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Equity attributable to stockholders of the Company | (239,486)us-gaap_StockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (140,620)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 | $ (216,672)us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | $ (98,559)us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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