XML 13 R48.htm IDEA: XBRL DOCUMENT v3.3.0.814
Segment Reporting (Revenue by Geographical Areas) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Revenues from External Customers [Line Items]        
Revenues $ 572,123 $ 442,443 $ 1,487,491 $ 1,283,718
Revenue as Percentage of Consolidated Revenue 100.00% 100.00% 100.00% 100.00%
Domestic [Member]        
Revenues from External Customers [Line Items]        
Revenues $ 546,747 $ 421,640 $ 1,420,492 $ 1,223,217
Revenue as Percentage of Consolidated Revenue 95.60% 95.30% 95.50% 95.30%
Foreign [Member]        
Revenues from External Customers [Line Items]        
Revenues $ 25,376 $ 20,803 $ 66,999 $ 60,501
Revenue as Percentage of Consolidated Revenue 4.40% 4.70% 4.50% 4.70%
Assignment [Member]        
Revenues from External Customers [Line Items]        
Revenues $ 539,383 $ 419,990 $ 1,402,116 $ 1,220,800
Revenue as Percentage of Consolidated Revenue 94.30% 94.90% 94.30% 95.10%
Direct hire and conversion fees [Member]        
Revenues from External Customers [Line Items]        
Revenues $ 32,740 $ 22,453 $ 85,375 $ 62,918
Revenue as Percentage of Consolidated Revenue 5.70% 5.10% 5.70% 4.90%