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Accumulated Comprehensive Income (Loss) | 12 Months Ended
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Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Accumulated Comprehensive Income (Loss) | Accumulated Comprehensive Income (Loss) Comprehensive income consists of net income and other gains and losses affecting shareholders’ equity that are excluded from net income. For the Company, comprehensive income includes unrealized gains and losses on available for sale securities and foreign currency translation adjustments. The Company presents comprehensive income in its Consolidated Statements of Comprehensive Income. Components of Accumulated other comprehensive income (loss) consisted of:
|  | Foreign Currency Translation Adjustments |  | Unrealized Holding Gains (Losses) on Investments |  | Accumulated Other Comprehensive Income (Loss)
Total accumulated comprehensive income (loss) at January 1, 2010 |  | (1,053 | ) |  | 960 |  |  | (93 | )
Less: Total accumulated comprehensive loss attributable to noncontrolling interest at January 1, 2010 |  | 1,351 |  |  | — |  |  | 1,351 |
Total accumulated comprehensive income attributable to SEI Investments Company at January 1, 2010 |  | $ | 298 |  |  | $ | 960 |  |  | $ | 1,258 |
Total comprehensive income |  | 2,205 |  |  | 379 |  |  | 2,584 |
Less: Total comprehensive income attributable to noncontrolling interest |  | (685 | ) |  | — |  |  | (685 | )
Total comprehensive income attributable to SEI Investments Company |  | $ | 1,520 |  |  | $ | 379 |  |  | $ | 1,899 |
Total accumulated comprehensive income at December 31, 2010 |  | 1,152 |  |  | 1,339 |  |  | 2,491 |
Less: Total accumulated comprehensive loss attributable to noncontrolling interest at December 31, 2010 |  | 666 |  |  | — |  |  | 666 |
Total accumulated comprehensive income attributable to SEI Investments Company at December 31, 2010 |  | $ | 1,818 |  |  | $ | 1,339 |  |  | $ | 3,157 |
Total comprehensive loss |  | (3,195 | ) |  | 1,235 |  |  | (1,960 | )
Less: Total comprehensive loss attributable to noncontrolling interest |  | 703 |  |  | — |  |  | 703 |
Total comprehensive loss attributable to SEI Investments Company |  | $ | (2,492 | ) |  | $ | 1,235 |  |  | $ | (1,257 | )
Total accumulated comprehensive income at December 31, 2011 |  | (2,043 | ) |  | 2,574 |  |  | 531 |
Less: Total accumulated comprehensive loss attributable to noncontrolling interest at December 31, 2011 |  | 1,369 |  |  | — |  |  | 1,369 |
Total accumulated comprehensive income attributable to SEI Investments Company at December 31, 2011 |  | $ | (674 | ) |  | $ | 2,574 |  |  | $ | 1,900 |
Total comprehensive income |  | 5,904 |  |  | 255 |  |  | 6,159 |
Less: Total comprehensive income attributable to noncontrolling interest |  | (1,820 | ) |  | — |  |  | (1,820 | )
Total comprehensive income attributable to SEI Investments Company |  | $ | 4,084 |  |  | $ | 255 |  |  | $ | 4,339 |
Total accumulated comprehensive income at December 31, 2012 |  | 3,861 |  |  | 2,829 |  |  | 6,690 |
Less: Total accumulated comprehensive income attributable to noncontrolling interest at December 31, 2012 |  | (451 | ) |  | — |  |  | (451 | )
Total accumulated comprehensive income attributable to SEI Investments Company at December 31, 2012 |  | $ | 3,410 |  |  | $ | 2,829 |  |  | $ | 6,239 |

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 14-26 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Reclassification Adjustments -URI http://asc.fasb.org/extlink&oid=6522872 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e681-108580 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e709-108580 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669619-108580 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e689-108580 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e716-108580 + Details
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