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401(k) Retirement Savings Plan, Deferred Compensation Plan and Change in Control Severance Plan (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  | 12 Months Ended | 0 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Vice President or Higher [Member] | Dec. 31, 2012 Chief Executive Officer [Member] | Dec. 31, 2012 2008 Amended and Restated CIC Agreement [Member] Chief Executive Officer [Member] | May 15, 2012 Apex Systems | Dec. 31, 2012 Apex Systems Long-term incentive program | May 15, 2012 Apex Systems Long-term incentive program
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |  |  |  |  |  |
Minimum service period for employee eligibility | 3 months |  |  |  |  |  | 12 months |  |
Minimum hours of work |  |  |  |  |  |  | 1000 hours |  |
Minimum age |  |  |  |  |  |  | 18 years |  |
Employer contributions to 401(k) plans | $ 3.7 | $ 1.1 | $ 0.4 |  |  |  |  |  |
Deferred compensation liability |  | 1.9 |  |  |  |  |  |  |
Cash surrender value of life insurance |  | 2.1 |  |  |  |  |  |  |
Proceeds from cash surrender value of life insurance policies | 1.5 |  |  |  |  |  |  |  |
Distributions to deferred compensation plan participants | 1.2 |  |  |  |  |  |  |  |
Long-term incentive program, maximum award |  |  |  |  |  |  |  |  | 10.0
Long-term incentive plan accrual |  |  |  |  | $ 2.0 |  |  | $ 10.0 | $ 7.9
Executive Change of Control Agreement, Involuntary Termination Period |  |  |  | 18 months |  | 6 months 10 days |  |  |

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- Definition Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Technical Bulletin (FTB) -Number 85-4 -Paragraph 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6812-107765 + Details
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