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Segment Information (Summarized Financial Information Of Reportable Segments) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Segment Reporting Information [Line Items]          
Total revenues $ 303,800 $ 260,401 $ 897,202 $ 769,445  
Investment income 239 317 561 934  
Amortization 15,956 13,725 47,450 40,790  
Depreciation 3,958 3,062 11,383 9,276  
Interest expense 4,006 3,565 12,093 10,780  
Income before income taxes 81,649 72,692 235,584 210,830  
Total assets 3,134,729 2,561,303 3,134,729 2,561,303 2,607,011
Capital expenditures 6,238 2,994 18,915 9,507  
Retail [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 157,824 151,714 487,047 462,629  
Investment income 32 28 84 72  
Amortization 8,686 8,390 25,865 24,830  
Depreciation 1,296 1,262 3,848 3,758  
Interest expense 6,635 6,825 20,273 20,538  
Income before income taxes 34,925 36,662 111,011 108,212  
Total assets 2,250,245 2,086,900 2,250,245 2,086,900  
Capital expenditures 1,376 1,943 4,011 5,059  
National Programs [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 66,847 42,095 184,420 120,240  
Investment income 5   16    
Amortization 3,286 1,922 9,740 5,769  
Depreciation 1,204 694 3,482 2,218  
Interest expense 5,737 263 16,740 1,036  
Income before income taxes 17,989 16,880 43,184 44,309  
Total assets 1,163,807 664,266 1,163,807 664,266  
Capital expenditures 1,993 394 7,843 1,126  
Wholesale Brokerage [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 50,464 48,169 141,251 135,637  
Investment income 6 9 17 26  
Amortization 2,819 2,769 8,392 8,256  
Depreciation 704 641 2,021 1,960  
Interest expense 922 1,800 3,043 5,902  
Income before income taxes 15,688 13,057 35,760 30,952  
Total assets 784,736 718,026 784,736 718,026  
Capital expenditures 471 235 2,357 1,852  
Services [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 28,695 17,229 82,185 49,515  
Investment income   1   127  
Amortization 1,155 634 3,424 1,906  
Depreciation 351 155 880 434  
Interest expense 2,981 1,404 8,982 4,392  
Income before income taxes 2,922 842 8,527 5,160  
Total assets 273,346 148,752 273,346 148,752  
Capital expenditures 1,470 92 2,275 596  
Other [Member]
          
Segment Reporting Information [Line Items]          
Total revenues (30) 1,194 2,299 1,424  
Investment income 196 279 444 709  
Amortization 10 10 29 29  
Depreciation 403 310 1,152 906  
Interest expense (12,269) (6,727) (36,945) (21,088)  
Income before income taxes 10,125 5,251 37,102 22,197  
Total assets (1,337,405) (1,056,641) (1,337,405) (1,056,641)  
Capital expenditures $ 928 $ 330 $ 2,429 $ 874