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Goodwill and Identifiable Assets (Goodwill) (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011
Goodwill [Roll Forward] |  |  |  |
Gross goodwill | $ 496,553 |  | $ 617,875 | $ 350,951
Accumulated impairment loss | 0 |  | (121,717) | (121,717)
Goodwill | 496,553 |  | 496,158 | 229,234
Acquisition |  |  | 264,590 |
Goodwill, Purchase Accounting Adjustments | 0 | (982) | 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 | 395 |  | 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 | 30,406 |  | 30,011 | 27,668
Accumulated impairment loss | 0 |  | 0 | 0
Goodwill | 30,406 |  | 30,011 | 27,668
Acquisition |  |  | 0 |
Goodwill, Purchase Accounting Adjustments |  |  | 1,814 |
Translation adjustment | 395 |  | 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) |

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