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Business Segments (Gross Accounts Receivable) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Segment Reporting Information |  |  |
Gross Accounts Receivable | $ 246,973 | $ 96,702 | $ 64,693
Apex |  |  |
Segment Reporting Information |  |  |
Gross Accounts Receivable | 132,575 | 0 | 0
Oxford |  |  |
Segment Reporting Information |  |  |
Gross Accounts Receivable | 56,336 | 47,658 | 30,725
Life Sciences |  |  |
Segment Reporting Information |  |  |
Gross Accounts Receivable | 21,041 | 21,727 | 14,107
Healthcare |  |  |
Segment Reporting Information |  |  |
Gross Accounts Receivable | 18,116 | 11,568 | 9,628
Physician |  |  |
Segment Reporting Information |  |  |
Gross Accounts Receivable | $ 18,905 | $ 15,749 | $ 10,233

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- Definition Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 3 -Subparagraph a, b -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration