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Fair Value Measurements | 9 Months Ended
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Sep. 30, 2015
Fair Value Disclosures [Abstract] |
Fair Value Measurements | Fair Value Measurements The fair value of the Company’s financial assets and liabilities is determined in accordance with the fair value hierarchy. The fair value of the Company’s Level 1 financial assets consist mainly of investments in open-ended mutual funds that are quoted daily. Level 2 financial assets consist of Government National Mortgage Association (GNMA) mortgage-backed securities held by the Company's wholly-owned limited purpose federal thrift subsidiary, SEI Private Trust Company (SPTC), Federal Home Loan Bank (FHLB) and other U.S. government agency short-term notes and investment grade commercial paper held by SIDCO, and investment funds sponsored by LSV. The financial assets held by SIDCO were purchased as part of a cash management program requiring only short term, top-tier investment grade government and corporate securities. The financial assets held by SPTC are debt securities issued by GNMA and are backed by the full faith and credit of the U.S. government. These securities were purchased for the sole purpose of satisfying applicable regulatory requirements and have maturity dates which range from 2020 to 2041. The valuation of the Company's Level 2 financial assets held by SIDCO and SPTC are based upon securities pricing policies and procedures utilized by third-party pricing vendors. As a practical expedient, the Company relies on the net asset values (NAVs) of the investment funds sponsored by LSV as the fair value. The NAVs of the funds are calculated by the funds' independent custodian and are derived from the fair values of the underlying investments as of the reporting date. The pricing policies and procedures applied during the nine months ended September 30, 2015 were consistent with those as described in our Annual Report on Form 10-K at December 31, 2014. The Company had no Level 3 financial assets or liabilities at September 30, 2015 or December 31, 2014. There were no transfers of financial assets between levels within the fair value hierarchy during the nine months ended September 30, 2015. The fair value of certain financial assets and liabilities of the Company was determined using the following inputs:
| At September 30, 2015
| Fair Value Measurements at Reporting Date Using
Assets | Total |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2)
Equity available-for-sale securities | $ | 11,002 |  |  | $ | 11,002 |  |  | $ | — |
Fixed income available-for-sale securities | 64,648 |  |  | — |  |  | 64,648 |
Fixed income securities owned | 21,225 |  |  | — |  |  | 21,225 |
Investment funds sponsored by LSV | 3,944 |  |  | — |  |  | 3,944 |
| $ | 100,819 |  |  | $ | 11,002 |  |  | $ | 89,817 |
| At December 31, 2014
| Fair Value Measurements at Reporting Date Using
Assets | Total |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2)
Equity available-for-sale securities | $ | 11,588 |  |  | $ | 11,588 |  |  | $ | — |
Fixed income available-for-sale securities | 66,021 |  |  | — |  |  | 66,021 |
Fixed income securities owned | 21,175 |  |  | — |  |  | 21,175 |
Investment funds sponsored by LSV | 4,523 |  |  | — |  |  | 4,523 |
| $ | 103,307 |  |  | $ | 11,588 |  |  | $ | 91,719 |

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- Definition The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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