Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph e

-Clause 1

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph l

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 34

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 43

-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 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph e

-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 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 72

-Subparagraph d

-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.

+ Details

- Definition

The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

+ References+ Details

Goodwill and Identifiable Assets (Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Dec. 31, 2010
Goodwill [Roll Forward]
Gross goodwill	$ 596,356		$ 350,951	$ 321,437
Accumulated impairment loss	(121,717)		(121,717)	(121,717)
Goodwill	474,639		229,234	199,720
Acquisition accounting	991	0
Translation adjustment	(396)		(990)
Valesta
Goodwill [Roll Forward]
Acquisition			16,097
HCP
Goodwill [Roll Forward]
Acquisition			14,407
Apex Systems
Goodwill [Roll Forward]
Acquisition	244,810
Apex
Goodwill [Roll Forward]
Gross goodwill	244,810		0	0
Accumulated impairment loss	0		0	0
Goodwill	244,810		0	0
Acquisition accounting	0
Translation adjustment	0		0
Apex \| Apex Systems
Goodwill [Roll Forward]
Acquisition	244,810
Oxford
Goodwill [Roll Forward]
Gross goodwill	149,483		149,483	149,483
Accumulated impairment loss	0		0	0
Goodwill	149,483		149,483	149,483
Acquisition accounting	0
Translation adjustment	0		0
Life Sciences
Goodwill [Roll Forward]
Gross goodwill	28,263		27,668	12,561
Accumulated impairment loss	0		0	0
Goodwill	28,263		27,668	12,561
Acquisition accounting	991
Translation adjustment	(396)		(990)
Life Sciences \| Valesta
Goodwill [Roll Forward]
Acquisition			16,097
Healthcare
Goodwill [Roll Forward]
Gross goodwill	122,230		122,230	122,230
Accumulated impairment loss	(121,717)		(121,717)	(121,717)
Goodwill	513		513	513
Acquisition accounting	0
Translation adjustment	0		0
Physician
Goodwill [Roll Forward]
Gross goodwill	51,570		51,570	37,163
Accumulated impairment loss	0		0	0
Goodwill	51,570		51,570	37,163
Acquisition accounting	0
Translation adjustment	0		0
Physician \| HCP
Goodwill [Roll Forward]
Acquisition			$ 14,407