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Goodwill (Details)
6 Months Ended
Jun. 30, 2019
USD ($)
Goodwill [Roll Forward]  
Balance as of December 31, 2018 $ 209,958,000
Foreign currency translation adjustments 291,000
Balance as of June 30, 2019 210,249,000
Goodwill impairment 0
Temporary and consulting staffing  
Goodwill [Roll Forward]  
Balance as of December 31, 2018 134,067,000
Foreign currency translation adjustments 77,000
Balance as of June 30, 2019 134,144,000
Permanent placement staffing  
Goodwill [Roll Forward]  
Balance as of December 31, 2018 26,058,000
Foreign currency translation adjustments 20,000
Balance as of June 30, 2019 26,078,000
Risk consulting and internal audit services  
Goodwill [Roll Forward]  
Balance as of December 31, 2018 49,833,000
Foreign currency translation adjustments 194,000
Balance as of June 30, 2019 $ 50,027,000