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.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Name:	us-gaap_AcquiredFiniteLivedIntangibleAssetAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Acquisitions (Schedule of Intangible Assets Acquired as Part of Business Combination) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013 Contractor relations	Jun. 30, 2013 Customer relations	Jun. 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