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Goodwill (Tables)
 9 Months Ended
Sep. 30, 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 nine months ended September 30, 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
11,854

 
(1
)
 
51,477

 
22,352

 
85,682

Goodwill of transferred businesses
571

 
(571
)
 
—

 
—

 
—

Balance as of September 30, 2016
$
1,358,061

 
$
901,294

 
$
278,438

 
$
134,572

 
$
2,672,365