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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