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401(k) Retirement Savings Plan, Deferred Compensation Plan and Change in Control Severance Plan (Details) (USD $) | 12 Months Ended |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jun. 30, 2012 | Dec. 31, 2013 Chief Executive Officer [Member] | Dec. 31, 2013 2008 Amended and Restated CIC Agreement [Member] Chief Executive Officer [Member] | Dec. 31, 2013 Apex Systems | Dec. 31, 2013 Apex Systems Long-term incentive program | 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 | $ 6,000,000 | $ 3,700,000 | $ 1,100,000 |  |  |  |  |  |  |
Document Fiscal Year Focus | 2013 |  |  |  |  |  |  |  |  |
Proceeds from cash surrender value of life insurance policies |  | 1,500,000 |  |  |  |  |  |  |  |
Distributions to deferred compensation plan participants |  |  |  | 1,200,000 |  |  |  |  |  |
Long-term incentive program, maximum award |  |  |  |  |  |  |  |  |  | 10,000,000
Long-term incentive plan accrual |  |  |  |  | 2,500,000 |  |  | 20,000 | 10,000,000 | 7,900,000
Deferred compensation | $ 20,000 | $ 10,000,000 |  |  |  |  |  |  |  |
Executive Change of Control Agreement, Involuntary Termination Period | 18 months |  |  |  |  | 6 months 10 days |  |  |  |

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