Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The number of businesses acquired by the entity during the period.

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Business Acquisitions (Details) $ in Thousands	9 Months Ended
Business Acquisitions (Details) $ in Thousands	Sep. 30, 2016 USD ($) Business	Jan. 07, 2016	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Goodwill	$ 5,969,328		$ 5,824,726
Business Acquisitions 2016 [Member]
Business Acquisition [Line Items]
Number of business acquired \| Business	3
Cost of acquired entity purchase price	$ 283,000
Goodwill	165,000
Intangible assets other than goodwill	163,000
Finite lived intangible assets	$ 153,000
Weighted average useful life	16 years
Business Acquisitions 2016 [Member] \| Customer Relationships [Member]
Business Acquisition [Line Items]
Finite lived intangible assets	$ 97,000
Weighted average useful life	20 years
Business Acquisitions 2016 [Member] \| Unpatented Technology [Member]
Business Acquisition [Line Items]
Finite lived intangible assets	$ 56,000
Weighted average useful life	9 years
Business Acquisitions 2016 [Member] \| Trade names [Member]
Business Acquisition [Line Items]
Indefinite lived intangible assets	$ 10,000
CliniSys Group, Ltd. [Member]
Business Acquisition [Line Items]
Percentage of voting interest acquired		100.00%
GeneInsight Inc. [Member]
Business Acquisition [Line Items]
Percentage of voting interest acquired		100.00%