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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