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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2016
$
1,345,636

 
$
901,866

 
$
226,961

 
$
112,220

 
$
2,586,683

Goodwill of acquired businesses
13,117

 
(1
)
 
57,908

 
22,352

 
93,376

Goodwill of transferred businesses
571

 
(571
)
 
—

 
—

 
—

Goodwill disposed of relating to sales of businesses
(4,657
)
 
—

 
—

 
—

 
(4,657
)
Balance as of December 31, 2016
$
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