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Goodwill
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill
Goodwill
The following table sets forth the activity in goodwill from December 31, 2015, through December 31, 2017 (in thousands):
 
 
Goodwill
  
Temporary and consultant staffing
 
Permanent placement staffing
 
Risk consulting and internal audit services
 
 Total
Balance as of December 31, 2015
$
133,173

 
$
26,251

 
$
49,155

 
$
208,579

Acquisitions
1,248

 
—

 
299

 
1,547

Foreign currency translation adjustments
(546
)
 
(236
)
 
449

 
(333
)
Balance as of December 31, 2016
$
133,875

 
$
26,015

 
$
49,903

 
$
209,793

Foreign currency translation adjustments
613

 
144

 
335

 
1,092

Balance as of December 31, 2017
$
134,488

 
$
26,159

 
$
50,238

 
$
210,885