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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2012
Valuation and Qualifying Accounts [Abstract] |
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] | ON ASSIGNMENT, INC. AND SUBSIDIARIES SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS Year Ended December 31, 2012, 2011 and 2010 (In thousands)
Description |  | Balance at beginning of year |  | Provisions |  | Deductions from reserves |  | Balance at end of year
Year ended December 31, 2012 |  |  |  |  |  |  |  |
Allowance for doubtful accounts and billing adjustments |  | $ | 2,777 |  |  | (166 | ) |  | 1,359 |  |  | $ | 3,970 |
Workers’ compensation and medical malpractice loss reserves |  | $ | 10,401 |  |  | 3,594 |  |  | (3,668 | ) |  | $ | 10,327 |
Year ended December 31, 2011 |  |  |  |  |  |  |  |
Allowance for doubtful accounts and billing adjustments |  | $ | 2,175 |  |  | 1,127 |  |  | (525 | ) |  | $ | 2,777 |
Workers’ compensation and medical malpractice loss reserves |  | $ | 10,244 |  |  | 2,339 |  |  | (2,182 | ) |  | $ | 10,401 |
Year ended December 31, 2010 |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts and billing adjustments |  | $ | 1,949 |  |  | 644 |  |  | (418 | ) |  | $ | 2,175 |
Workers’ compensation and medical malpractice loss reserves |  | $ | 10,349 |  |  | 4,310 |  |  | (4,415 | ) |  | $ | 10,244 |

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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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