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Goodwill and Identifiable Assets (Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2012	Jun. 30, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill [Roll Forward]
Gross goodwill		$ 495,638	$ 617,875	$ 350,951
Accumulated impairment loss		0	(121,717)	(121,717)
Goodwill		495,638	496,158	229,234
Acquisition			264,590
Goodwill, Purchase Accounting Adjustments	(991)	0	1,805
Goodwill, Written off Related to Sale of Business Unit		(121,717)
Write-off of accum impairment loss related to sale of business unit		121,717
Translation adjustment		(520)	529
Apex
Goodwill [Roll Forward]
Gross goodwill		264,590	264,590	0
Accumulated impairment loss		0	0	0
Goodwill		264,590	264,590	0
Acquisition			264,590
Translation adjustment		0	0
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
Translation adjustment		0	0
Life Sciences
Goodwill [Roll Forward]
Gross goodwill		29,491	30,011	27,668
Accumulated impairment loss		0	0	0
Goodwill		29,491	30,011	27,668
Acquisition			0
Goodwill, Purchase Accounting Adjustments			1,814
Translation adjustment		(520)	529
Healthcare
Goodwill [Roll Forward]
Gross goodwill		513	122,230	122,230
Accumulated impairment loss		0	(121,717)	(121,717)
Goodwill		513	513	513
Goodwill, Written off Related to Sale of Business Unit		(121,717)
Write-off of accum impairment loss related to sale of business unit		121,717
Translation adjustment		0	0
Physician
Goodwill [Roll Forward]
Gross goodwill		51,561	51,561	51,570
Accumulated impairment loss		0	0	0
Goodwill		51,561	51,561	51,570
Translation adjustment		0	0
Physician | Health Care Partners [Member]
Goodwill [Roll Forward]
Goodwill, Purchase Accounting Adjustments			$ (9)

X

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