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Schedule II - Valuation And Qualifying Accounts And Reserves Valuation And Qualifying Accounts And Reserves (Tables) | 12 Months Ended
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Dec. 31, 2012
Valuation and Qualifying Accounts [Abstract] |
Valuation And Qualifying Accounts |
Schedule II - Valuation and Qualifying Accounts and Reserves |  |  |  | SEI Investments Company and Subsidiaries |
Year Ended December 31, |  |  | Additions |  |  |  |
Description |  | Balance at Beginning of Year |  | Charged to Costs and Expenses |  | Charged to Other Accounts |  | (Deductions) |  | Balance at End of Year
Allowance for doubtful accounts: |  |  |  |  |  |  |  |  |  |
2012 |  | $ | 924 |  |  | $ | — |  |  | $ | — |  |  | $ | (119 | ) |  | $ | 805 |
2011 |  | 1,195 |  |  | — |  |  | — |  |  | (271 | ) |  | 924 |
2010 |  | 3,348 |  |  | — |  |  | — |  |  | (2,153 | ) |  | 1,195 |
Deferred income tax valuation allowance: |  |  |  |  |  |  |  |  |  |
2012 |  | $ | 8,585 |  |  | $ | (1,706 | ) |  | $ | — |  |  | $ | — |  |  | $ | 6,879 |
2011 |  | 9,008 |  |  | (423 | ) |  | — |  |  | — |  |  | 8,585 |
2010 |  | 6,217 |  |  | 1,443 |  |  | 1,348 |  |  | — |  |  | 9,008 |

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- Definition Tabular disclosure of valuation allowances to reduce deferred tax assets to net realizable value, including identification of the deferred tax asset more likely than not will not be fully realized and the corresponding amount of the valuation allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Valuation Allowance -URI http://asc.fasb.org/extlink&oid=6528051 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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