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Acquisitions (Schedule of Intangible Assets Acquired as Part of Business Combination) (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2013 Contractor relations | Sep. 30, 2013 Customer relations | Sep. 30, 2013 Non-compete agreements | May 15, 2012 Apex Systems | May 15, 2012 Apex Systems Trademarks | May 15, 2012 Apex Systems Contractor relations | May 15, 2012 Apex Systems Customer relations | May 15, 2012 Apex Systems Non-compete agreements
Acquired Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Finite lived, Intangible asset value |  |  |  |  |  | $ 10,589 | $ 92,147 | $ 2,076
Useful life | 5 years | 10 years | 7 years |  |  |  |  |
Indefinite lived, Intangible asset value |  |  |  |  | 146,743 |  |  |
Total intangible assets acquired |  |  |  | $ 251,555 |  |  |  |

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- Definition The aggregate amount assigned to a major class of finite-lived intangible assets acquired either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 44 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The aggregate cost of a major indefinite-lived intangible asset class acquired, during the period, either individually or as part of a group of assets (in either an asset acquisition or business combination). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 44 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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