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Consolidated Statements Of Changes In Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Stock [Member] | Capital In Excess Of Par Value [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive (Loss) Income [Member] | SEI Investments Company [Member] | Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2009 |  | $ 1,902 | $ 522,080 | $ 384,483 | $ 1,258 |  |
Beginning balance, shares at Dec. 31, 2009 |  | 190,208,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income attributable to SEI | 231,687 |  |  | 231,687 |  |  |
Purchase and retirement of common stock |  | (58) | (13,426) | (107,498) |  |  |
Purchase and retirement of common stock, shares | 5,814,000 | (5,814,000) |  |  |  |  |
Issuance of common stock under the employee stock purchase plan |  | 1 | 1,902 |  |  |  |
Issuance of common stock under the employee stock purchase plan, shares |  | 114,000 |  |  |  |  |
Issuance of common stock upon exercise of stock options |  | 16 | 26,177 |  |  |  |
Issuance of common stock upon exercise of stock options, shares | (1,633,000) | 1,633,000 |  |  |  |  |
Stock-based compensation | 26,783 |  | 26,783 |  |  |  |
Tax benefit on stock options exercised |  |  | 1,877 |  |  |  |
Dividends declared | 37,513 |  |  | (37,513) |  |  |
Other comprehensive (loss) income | 2,584 |  |  |  | 1,899 |  |
Total SEI Investments Shareholders' Equity |  |  |  |  |  | 1,041,570 |
Noncontrolling Interest | 15,155 |  |  |  |  |  | 15,155
Total Equity at Dec. 31, 2010 | 1,056,725 | 1,861 | 565,393 | 471,159 | 3,157 |  |
Ending balance, shares at Dec. 31, 2010 |  | 186,141,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income attributable to SEI | 204,959 |  |  | 204,959 |  |  |
Purchase and retirement of common stock |  | (111) | (27,196) | (183,858) |  |  |
Purchase and retirement of common stock, shares | 11,109,000 | (11,109,000) |  |  |  |  |
Issuance of common stock under the employee stock purchase plan |  | 1 | 1,892 |  |  |  |
Issuance of common stock under the employee stock purchase plan, shares |  | 110,000 |  |  |  |  |
Issuance of common stock upon exercise of stock options |  | 14 | 22,314 |  |  |  |
Issuance of common stock upon exercise of stock options, shares | (1,364,000) | 1,364,000 |  |  |  |  |
Stock-based compensation | 14,112 |  | 14,112 |  |  |  |
Tax benefit on stock options exercised |  |  | 1,434 |  |  |  |
Dividends declared | 48,558 |  |  | (48,558) |  |  |
Other comprehensive (loss) income | (1,960) |  |  |  | (1,257) |  |
Total SEI Investments Shareholders' Equity | 1,025,316 |  |  |  |  | 1,025,316 |
Noncontrolling Interest | 16,143 |  |  |  |  |  | 16,143
Total Equity at Dec. 31, 2011 | 1,041,459 | 1,765 | 577,949 | 443,702 | 1,900 |  |
Ending balance, shares at Dec. 31, 2011 | 176,506,000 | 176,506,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income attributable to SEI | 206,848 |  |  | 206,848 |  |  |
Purchase and retirement of common stock |  | (75) | (19,370) | (135,819) |  |  |
Purchase and retirement of common stock, shares | 7,528,000 | (7,528,000) |  |  |  |  |
Issuance of common stock under the employee stock purchase plan |  | 1 | 1,794 |  |  |  |
Issuance of common stock under the employee stock purchase plan, shares | 11,580,000 | 105,000 |  |  |  |  |
Issuance of common stock upon exercise of stock options |  | 31 | 47,613 |  |  |  |
Issuance of common stock upon exercise of stock options, shares | (3,136,000) | 3,137,000 |  |  |  |  |
Stock-based compensation | 15,736 |  | 15,736 |  |  |  |
Tax benefit on stock options exercised |  |  | 583 |  |  |  |
Dividends declared | 108,817 |  |  | (108,817) |  |  |
Other comprehensive (loss) income | 6,159 |  |  |  | 4,339 |  |
Total SEI Investments Shareholders' Equity | 1,038,180 |  |  |  |  | 1,038,180 |
Noncontrolling Interest | 19,149 |  |  |  |  |  | 19,149
Total Equity at Dec. 31, 2012 | $ 1,057,329 | $ 1,722 | $ 624,305 | $ 405,914 | $ 6,239 |  |
Ending balance, shares at Dec. 31, 2012 | 172,220,000 | 172,220,000 |  |  |  |  |

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