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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2018
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 years ended December 31, are as follows: 
(in thousands)
Retail
 
National
Programs
 
Wholesale
Brokerage
 
Services
 
Total
Balance as of January 1, 2017
$
1,354,667

 
$
901,294

 
$
284,869

 
$
134,572

 
$
2,675,402

Goodwill of acquired businesses
33,076

 
7,178

 
1,229

 
689

 
42,172

Goodwill disposed of relating to sales of businesses
(1,495
)
 
—

 
—

 
—

 
(1,495
)
Balance as of December 31, 2017
$
1,386,248

 
$
908,472

 
$
286,098

 
$
135,261

 
$
2,716,079

Goodwill of acquired businesses
676,902

 
18,737

 
5,524

 
16,547

 
717,710

Goodwill disposed of relating to sales of businesses
—

 
(1,003
)
 
—

 
—

 
(1,003
)
Balance as of December 31, 2018
$
2,063,150

 
$
926,206

 
$
291,622

 
$
151,808

 
$
3,432,786