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Segment Information - Summarized Financial Information Reportable Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Total revenues $ 363,594 $ 335,012  
Investment income 103 186  
Amortization 17,876 16,161  
Depreciation 4,640 4,167  
Interest expense 4,072 3,984  
Income before income taxes 86,837 99,491  
Total assets 3,674,289 3,230,360 3,649,508
Capital expenditures 4,727 2,947  
Operating Segments [Member] | Retail [Member]
      
Segment Reporting Information [Line Items]      
Total revenues 202,691 174,568  
Investment income 16 23  
Amortization 10,151 8,811  
Depreciation 1,584 1,371  
Interest expense 10,713 6,200  
Income before income taxes 41,245 46,211  
Total assets 3,032,674 2,483,391  
Capital expenditures 2,112 1,335  
Operating Segments [Member] | National Programs [Member]
      
Segment Reporting Information [Line Items]      
Total revenues 74,170 68,940  
Investment income 5 5  
Amortization 3,775 3,519  
Depreciation 1,467 1,248  
Interest expense 5,441 5,694  
Income before income taxes 16,123 14,012  
Total assets 1,338,120 1,194,383  
Capital expenditures 1,698 892  
Operating Segments [Member] | Wholesale Brokerage [Member]
      
Segment Reporting Information [Line Items]      
Total revenues 55,020 48,697  
Investment income 4 5  
Amortization 2,883 2,897  
Depreciation 650 707  
Interest expense 419 755  
Income before income taxes 12,738 10,362  
Total assets 940,604 882,273  
Capital expenditures 482 536  
Operating Segments [Member] | Services [Member]
      
Segment Reporting Information [Line Items]      
Total revenues 31,642 42,647  
Investment income 2 1  
Amortization 1,057 924  
Depreciation 463 397  
Interest expense 1,970 1,921  
Income before income taxes 2,815 13,953  
Total assets 276,219 248,882  
Capital expenditures 291 119  
Other [Member]
      
Segment Reporting Information [Line Items]      
Total revenues 71 160  
Investment income 76 152  
Amortization 10 10  
Depreciation 476 444  
Interest expense (14,471) (10,586)  
Income before income taxes 13,916 14,953  
Total assets (1,913,328) (1,578,569)  
Capital expenditures $ 144 $ 65