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Business Acquisitions (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 USD ($) Business | Dec. 31, 2014 USD ($) Business | Dec. 31, 2013 USD ($) Business
Business Acquisition [Line Items] |  |  |
Number of business acquired | Business | 8 | 3 | 2
Fair value of assets acquired and liabilities assumed [Abstract] |  |  |
Intangible Assets Other than Goodwill |  |  | $ 493,000
Goodwill | $ 5,824,726 | $ 4,710,691 | 4,549,998
Intangibles acquired |  |  | 493,000
Finite lived intangible assets |  |  | $ 465,000
Weighted average useful life |  |  | 19 years
Cost of acquired entity transaction costs |  |  | $ 3,300
Trade Names [Member] |  |  |
Fair value of assets acquired and liabilities assumed [Abstract] |  |  |
Indefinite lived intangible assets |  |  | 28,000
Customer Relationships [Member] |  |  |
Fair value of assets acquired and liabilities assumed [Abstract] |  |  |
Finite lived intangible assets |  |  | $ 451,000
Weighted average useful life |  |  | 20 years
Technology [Member] |  |  |
Fair value of assets acquired and liabilities assumed [Abstract] |  |  |
Finite lived intangible assets |  |  | $ 12,000
Weighted average useful life |  |  | 7 years
Noncompete Agreements [Member] |  |  |
Fair value of assets acquired and liabilities assumed [Abstract] |  |  |
Finite lived intangible assets |  |  | $ 2,000
Weighted average useful life |  |  | 5 years
Immaterial Acquisitions [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cost of acquired entity purchase price | 1,800,000 | 303,000 |
Fair value of assets acquired and liabilities assumed [Abstract] |  |  |
Intangible Assets Other than Goodwill | 731,000 | 99,000 |
Goodwill | 1,200,000 | 208,000 |
Indefinite lived intangible assets | 51,000 | 7,000 |
Intangibles acquired | 731,000 | 99,000 |
Finite lived intangible assets | $ 680,000 | $ 92,000 |
Weighted average useful life | 17 years | 17 years |
Cost of acquired entity transaction costs | $ 5,900 | $ 2,800 |
Immaterial Acquisitions [Member] | Backlog [Member] |  |  |
Fair value of assets acquired and liabilities assumed [Abstract] |  |  |
Finite lived intangible assets |  | $ 1,000 |
Weighted average useful life |  | 1 year |
Immaterial Acquisitions [Member] | Customer Relationships [Member] |  |  |
Fair value of assets acquired and liabilities assumed [Abstract] |  |  |
Finite lived intangible assets | $ 541,000 | $ 82,000 |
Weighted average useful life | 19 years | 19 years |
Immaterial Acquisitions [Member] | Technology [Member] |  |  |
Fair value of assets acquired and liabilities assumed [Abstract] |  |  |
Finite lived intangible assets | $ 100,000 | $ 7,000 |
Weighted average useful life | 8 years | 6 years |
Immaterial Acquisitions [Member] | Software [Member] |  |  |
Fair value of assets acquired and liabilities assumed [Abstract] |  |  |
Finite lived intangible assets | $ 39,000 | $ 2,000 |
Weighted average useful life | 6 years | 4 years |
Advanced Sensors, Ltd [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cost of acquired entity purchase price |  |  | $ 54,000
Fair value of assets acquired and liabilities assumed [Abstract] |  |  |
Goodwill |  |  | 28,000
Indefinite lived intangible assets |  |  | 28,000
Managed Health Care Associates, Inc [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cost of acquired entity purchase price |  |  | 1,000,000
Fair value of assets acquired and liabilities assumed [Abstract] |  |  |
Current assets |  |  | 59,813
Intangible Assets Other than Goodwill |  |  | 465,500
Goodwill |  |  | 678,183
Other assets |  |  | 5,798
Total assets acquired |  |  | 1,209,294
Current liabilities |  |  | (24,717)
Long-term deferred tax liability |  |  | (162,503)
Other liabilities |  |  | (6,524)
Net assets acquired |  |  | 1,015,550
Fair value adjustment for admin fees related to customer purchases |  |  | 35,000
Fair value liability related revenue-share obligation |  |  | 8,600
Intangibles acquired |  |  | $ 465,500

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