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Goodwill (Tables)
 3 Months Ended
Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Carrying Value of Goodwill by Operating Segment
The changes in the carrying value of goodwill by reportable segment for the three months ended March 31, 2016 are as follows:
(in thousands)
Retail
 
National
Programs
 
Wholesale
Brokerage
 
Services
 
Total
Balance as of January 1, 2016
$
1,345,636

 
$
901,866

 
$
226,961

 
$
112,220

 
$
2,586,683

Goodwill of acquired businesses
6,704

 
(70
)
 
24

 
22,294

 
28,952

Goodwill of transferred businesses
571

 
(571
)
 
—

 
—

 
—

Balance as of March 31, 2016
$
1,352,911

 
$
901,225

 
$
226,985

 
$
134,514

 
$
2,615,635