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Fair Value Measurements - Investments in Company-Sponsored Funds (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015
Investment Holdings [Line Items] |
Fair Value | $ 8,465 us-gaap_InvestmentsFairValueDisclosure
Unfunded Commitments | 1,251 us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
Hedge Funds [Member] |
Investment Holdings [Line Items] |
Fair Value | 2,092 us-gaap_InvestmentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_HedgeFundsMember
Redemption Frequency | Quarterly - Annually
Investment Redemption Notice Period Minimum | 30 days
Investment Redemption Notice Period Maximum | 120 days
Private Equity Funds [Member] |
Investment Holdings [Line Items] |
Fair Value | 6,373 us-gaap_InvestmentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_PrivateEquityFundsMember
Unfunded Commitments | $ 1,251 us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments / us-gaap_InvestmentTypeAxis = us-gaap_PrivateEquityFundsMember
Investments Lock In Period | 10 years
Maximum [Member] | Hedge Funds [Member] |
Investment Holdings [Line Items] |
Investments Lock In Period | 1 year

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- Definition The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=SL6742756-110258 + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 + Details
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