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Segment Information - Summarized Financial Information Reportable Segments (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]                      
Total revenues $ 508,748 $ 530,850 $ 473,187 $ 501,461 $ 474,316 $ 475,646 $ 466,305 $ 465,080 $ 2,014,246 $ 1,881,347 $ 1,766,629
Investment income                 2,746 1,626 1,456
Amortization                 86,544 85,446 86,663
Depreciation                 22,834 22,698 21,003
Interest expense                 40,580 38,316 39,481
Income before income taxes 100,611 $ 142,500 $ 100,910 $ 118,441 106,334 $ 124,419 $ 108,002 $ 110,967 462,462 449,722 423,499
Total assets 6,688,668       5,747,550       6,688,668 5,747,550 5,262,734
Capital expenditures                 41,520 24,192 17,765
Operating Segments | Retail                      
Segment Reporting Information [Line Items]                      
Total revenues                 1,042,763 943,460 917,406
Investment income                 2 8 37
Amortization                 44,386 42,164 43,447
Depreciation                 5,289 5,210 6,191
Interest expense                 35,969 31,133 38,216
Income before income taxes                 217,845 196,616 188,001
Total assets 5,850,045       4,255,515       5,850,045 4,255,515 3,854,393
Capital expenditures                 6,858 4,494 5,951
Operating Segments | National Programs                      
Segment Reporting Information [Line Items]                      
Total revenues                 494,463 479,813 448,516
Investment income                 506 384 628
Amortization                 25,954 27,277 27,920
Depreciation                 5,486 6,325 7,868
Interest expense                 26,181 35,561 45,738
Income before income taxes                 117,375 109,961 91,762
Total assets 2,940,097       3,267,486       2,940,097 3,267,486 2,711,378
Capital expenditures                 12,391 5,936 6,977
Operating Segments | Wholesale Brokerage                      
Segment Reporting Information [Line Items]                      
Total revenues                 287,014 271,737 243,103
Investment income                 165 0 4
Amortization                 11,391 11,456 10,801
Depreciation                 1,628 1,885 1,975
Interest expense                 5,254 6,263 3,976
Income before income taxes                 70,171 68,844 62,623
Total assets 1,283,877       1,260,239       1,283,877 1,260,239 1,108,829
Capital expenditures                 2,518 1,836 1,301
Operating Segments | Services                      
Segment Reporting Information [Line Items]                      
Total revenues                 189,246 165,372 156,365
Investment income                 205 299 283
Amortization                 4,813 4,548 4,485
Depreciation                 1,558 1,600 1,881
Interest expense                 2,869 3,522 4,950
Income before income taxes                 34,508 30,498 24,338
Total assets 471,572       399,240       471,572 399,240 371,645
Capital expenditures                 1,525 1,033 656
Other                      
Segment Reporting Information [Line Items]                      
Total revenues                 760 20,965 1,239
Investment income                 1,868 935 504
Amortization                 0 1 10
Depreciation                 8,873 7,678 3,088
Interest expense                 (29,693) (38,163) (53,399)
Income before income taxes                 22,563 43,803 56,775
Total assets $ (3,856,923)       $ (3,434,930)       (3,856,923) (3,434,930) (2,783,511)
Capital expenditures                 $ 18,228 $ 10,893 $ 2,880