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Business Acquisitions (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) ReportingUnit $ / shares | Dec. 31, 2015 USD ($) ReportingUnit $ / shares | Dec. 31, 2014 USD ($) ReportingUnit | Dec. 27, 2016 USD ($)
Fair value of assets acquired and liabilities assumed [Abstract] |  |  |  |  |
Goodwill | $ 8,647,142 | $ 8,647,142 | $ 5,824,726 | $ 4,710,691 |
Goodwill | 8,647,142 | 8,647,142 | 5,824,726 | $ 4,710,691 |
Acquisition-related and other non-recurring costs |  |  |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  | $ 47,400 | $ 37,200 |  |
Immaterial Acquisitions [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of business acquired | ReportingUnit |  | 5 | 8 | 3 |
Cost of acquired entity purchase price |  | $ 920,000 | $ 1,800,000 | $ 303,000 |
Fair value of assets acquired and liabilities assumed [Abstract] |  |  |  |  |
Intangible assets other than goodwill | 372,000 | 372,000 | 731,000 | 99,000 |
Goodwill | 642,000 | 642,000 | 1,200,000 | 208,000 |
Goodwill | 642,000 | 642,000 | 1,200,000 | 208,000 |
Indefinite lived intangible assets | 34,000 | 34,000 | 51,000 | 7,000 |
Intangibles acquired | 372,000 | 372,000 | 731,000 | 99,000 |
Finite lived intangible assets | 338,000 | $ 338,000 | $ 680,000 | $ 92,000 |
Weighted average useful life |  | 12 years | 17 years | 17 years |
Cost of acquired entity transaction costs | 4,200 | $ 4,200 | $ 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 | 242,000 | $ 242,000 | $ 541,000 | $ 82,000 |
Weighted average useful life |  | 14 years | 19 years | 19 years |
Immaterial Acquisitions [Member] | Software [Member] |  |  |  |  |
Fair value of assets acquired and liabilities assumed [Abstract] |  |  |  |  |
Finite lived intangible assets | 30,000 | $ 30,000 | $ 39,000 | $ 2,000 |
Weighted average useful life |  | 9 years | 6 years | 4 years |
Immaterial Acquisitions [Member] | Unpatented Technology [Member] |  |  |  |  |
Fair value of assets acquired and liabilities assumed [Abstract] |  |  |  |  |
Finite lived intangible assets | 66,000 | $ 66,000 | $ 100,000 | $ 7,000 |
Weighted average useful life |  | 6 years | 8 years | 6 years |
Deltek [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cost of acquired entity purchase price |  | $ 2,800,000 |  |  |
Fair value of assets acquired and liabilities assumed [Abstract] |  |  |  |  |
Receivables |  |  |  |  | $ 94,506
Current assets |  |  |  |  | 37,558
Intangible assets other than goodwill | 972,000 | 972,000 |  |  | 972,000
Goodwill |  |  |  |  | 2,234,549
Other assets |  |  |  |  | 43,098
Total assets acquired |  |  |  |  | 3,381,711
Deferred Revenue |  |  |  |  | 166,393
Other Current Liabilities |  |  |  |  | 57,433
Long-term deferred tax liability |  |  |  |  | 349,810
Other liabilities |  |  |  |  | 7,935
Net assets acquired |  |  |  |  | 2,800,140
Goodwill |  |  |  |  | 2,234,549
Indefinite lived intangible assets | 145,000 | 145,000 |  |  |
Intangibles acquired | 972,000 | 972,000 |  |  | $ 972,000
Finite lived intangible assets | 765,000 | $ 765,000 |  |  |
Weighted average useful life |  | 12 years |  |  |
Cost of acquired entity transaction costs | 4,300 | $ 4,300 |  |  |
Business Acquisition, Pro Forma Information [Abstract] |  |  |  |  |
Revenue since Acquisition Date | 7,900 |  |  |  |
Earnings since Acquisition Date | 800 |  |  |  |
Pro Forma Revenue |  | 4,268,052 | $ 4,012,030 |  |
Pro Forma Income, Net of Tax |  | $ 656,404 | $ 647,089 |  |
Pro Forma Income, Net of Tax, Per Share, Basic | $ / shares |  | $ 6.48 | $ 6.43 |  |
Pro Forma Income, Net of Tax, Per Share, Diluted | $ / shares |  | $ 6.41 | $ 6.37 |  |
Deltek [Member] | Customer Relationships [Member] |  |  |  |  |
Fair value of assets acquired and liabilities assumed [Abstract] |  |  |  |  |
Finite lived intangible assets | 625,000 | $ 625,000 |  |  |
Weighted average useful life |  | 13 years |  |  |
Deltek [Member] | In Process Research and Development [Member] |  |  |  |  |
Fair value of assets acquired and liabilities assumed [Abstract] |  |  |  |  |
Finite lived intangible assets | 62,000 | $ 62,000 |  |  |
Deltek [Member] | Unpatented Technology [Member] |  |  |  |  |
Fair value of assets acquired and liabilities assumed [Abstract] |  |  |  |  |
Finite lived intangible assets | $ 140,000 | $ 140,000 |  |  |
Weighted average useful life |  | 6 years |  |  |
Total Acquisitions [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of business acquired | ReportingUnit |  | 6 |  |  |

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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary difference assumed at the acquisition date that are classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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