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Revenue Recognition - Schedule of Revenue Disaggregated by Line of Business (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
segment
Mar. 31, 2017
USD ($)
Disaggregation of Revenue [Line Items]    
Number of reportable segments | segment 3  
Net service revenues $ 1,395,333 $ 1,287,370
Accountemps    
Disaggregation of Revenue [Line Items]    
Net service revenues 471,589 436,539
OfficeTeam    
Disaggregation of Revenue [Line Items]    
Net service revenues 261,152 236,179
Robert Half Technology    
Disaggregation of Revenue [Line Items]    
Net service revenues 160,062 157,439
Robert Half Management Resources    
Disaggregation of Revenue [Line Items]    
Net service revenues 173,485 157,449
Temporary and consulting staffing revenues    
Disaggregation of Revenue [Line Items]    
Net service revenues 1,066,288 987,606
Permanent placement staffing revenues    
Disaggregation of Revenue [Line Items]    
Net service revenues 121,400 103,633
Risk consulting and internal audit revenues    
Disaggregation of Revenue [Line Items]    
Net service revenues $ 207,645 $ 196,131