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Schedule II - Valuation And Qualifying Accounts And Reserves | 12 Months Ended
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Dec. 31, 2012
Valuation and Qualifying Accounts [Abstract] |
Schedule II - Valuation And Qualifying Accounts And Reserves |
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 The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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