Goodwill and Other Intangible Assets (Details) 1 (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Goodwill [Roll Forward]  
Goodwill, Beginning Balance $ 4,720,275
Goodwill, Measurement period adjustment 2,338 [1]
Goodwill, Working capital adjustments 2,026 [2]
Goodwill, Acquisitions 0
Goodwill, Ending Balance 4,724,639
P B M [Member]
  
Goodwill [Roll Forward]  
Goodwill, Beginning Balance 4,700,610
Goodwill, Measurement period adjustment 2,338 [1]
Goodwill, Working capital adjustments 2,026 [2]
Goodwill, Acquisitions 0
Goodwill, Ending Balance 4,704,974
H C I T [Member]
  
Goodwill [Roll Forward]  
Goodwill, Beginning Balance 19,665
Goodwill, Measurement period adjustment 0 [1]
Goodwill, Working capital adjustments 0 [2]
Goodwill, Acquisitions 0
Goodwill, Ending Balance $ 19,665
[1] Represents adjustments to the fair value of assets acquired and liabilities assumed for recent acquisitions during the measurement period. The measurement period adjustments were not recast to the 2013 consolidated financial statements as they were not deemed material.
[2] Represents adjustments to purchase price for the Restat acquisition, including settlement of working capital adjustment