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Business Segments (Tables)
9 Months Ended
Sep. 30, 2014
Segment Reporting [Abstract]  
Reconciliation of Revenue and Operating Income by Reportable Segment to Consolidated Results
The following table provides a reconciliation of revenue and operating income by reportable segment to consolidated results for the three and nine months ended September 30, 2014 and 2013 (in thousands):

 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2014
 
2013
 
2014
 
2013
Net service revenues
 
 
 
 
 
 
 
Temporary and consultant staffing
$
954,225

 
$
847,886

 
$
2,722,833

 
$
2,513,377

Permanent placement staffing
102,345

 
88,222

 
297,797

 
261,946

Risk consulting and internal audit services
167,738

 
139,011

 
452,934

 
386,708

 
$
1,224,308

 
$
1,075,119

 
$
3,473,564

 
$
3,162,031

Operating income
 
 
 
 
 
 
 
Temporary and consultant staffing
$
97,660

 
$
76,532

 
$
263,901

 
$
226,293

Permanent placement staffing
21,380

 
13,691

 
61,103

 
41,753

Risk consulting and internal audit services
19,213

 
13,690

 
39,011

 
26,166

 
138,253

 
103,913

 
364,015

 
294,212

Amortization of intangible assets

 
433

 
557

 
1,300

Interest income, net
(108
)
 
(233
)
 
(570
)
 
(773
)
Income before income taxes
$
138,361

 
$
103,713

 
$
364,028

 
$
293,685