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Segment Information - Summarized Financial Information Reportable Segments (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | $ 397,764 | $ 325,792 | $ 761,358 | $ 660,804 |
Investment income | 194 | 239 | 297 | 425 |
Amortization | 20,623 | 16,121 | 38,499 | 32,282 |
Depreciation | 5,242 | 4,263 | 9,882 | 8,430 |
Interest expense | 7,004 | 3,997 | 11,076 | 7,981 |
Income before income taxes | 101,781 | 86,221 | 188,618 | 185,712 |
Total assets | 4,930,472 | 3,326,320 | 4,930,472 | 3,326,320 | 3,649,508
Capital expenditures | 7,850 | 4,176 | 12,577 | 7,123 |
Operating Segments [Member] | Retail [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 210,976 | 171,819 | 413,667 | 346,387 |
Investment income | 16 | 23 | 32 | 46 |
Amortization | 10,457 | 8,789 | 20,608 | 17,600 |
Depreciation | 1,614 | 1,371 | 3,198 | 2,742 |
Interest expense | 11,224 | 5,649 | 21,937 | 11,849 |
Income before income taxes | 49,098 | 44,482 | 90,343 | 90,693 |
Total assets | 3,166,802 | 2,501,084 | 3,166,802 | 2,501,084 |
Capital expenditures | 1,567 | 1,488 | 3,679 | 2,823 |
Operating Segments [Member] | National Programs [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 90,875 | 68,354 | 165,045 | 137,294 |
Investment income | 66 | 5 | 71 | 10 |
Amortization | 6,214 | 3,511 | 9,989 | 7,030 |
Depreciation | 1,842 | 1,326 | 3,309 | 2,574 |
Interest expense | 12,447 | 5,590 | 17,888 | 11,284 |
Income before income taxes | 9,685 | 11,226 | 25,808 | 25,238 |
Total assets | 2,406,240 | 1,224,175 | 2,406,240 | 1,224,175 |
Capital expenditures | 5,159 | 1,420 | 6,857 | 2,312 |
Operating Segments [Member] | Wholesale Brokerage [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 60,059 | 54,823 | 115,079 | 103,520 |
Investment income | 7 | 4 | 11 | 9 |
Amortization | 2,932 | 2,887 | 5,815 | 5,784 |
Depreciation | 670 | 716 | 1,320 | 1,423 |
Interest expense | 523 | 723 | 942 | 1,478 |
Income before income taxes | 17,376 | 15,760 | 30,114 | 26,122 |
Total assets | 990,355 | 925,901 | 990,355 | 925,901 |
Capital expenditures | 517 | 561 | 999 | 1,097 |
Operating Segments [Member] | Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 35,757 | 30,403 | 67,399 | 73,050 |
Investment income |  |  | 2 | 1 |
Amortization | 1,010 | 925 | 2,067 | 1,849 |
Depreciation | 628 | 401 | 1,091 | 798 |
Interest expense | 1,971 | 1,883 | 3,941 | 3,804 |
Income before income taxes | 5,008 | 2,589 | 7,823 | 16,542 |
Total assets | 278,137 | 246,235 | 278,137 | 246,235 |
Capital expenditures | 244 | 379 | 535 | 498 |
Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 97 | 393 | 168 | 553 |
Investment income | 105 | 207 | 181 | 359 |
Amortization | 10 | 9 | 20 | 19 |
Depreciation | 488 | 449 | 964 | 893 |
Interest expense | (19,161) | (9,848) | (33,632) | (20,434) |
Income before income taxes | 20,614 | 12,164 | 34,530 | 27,117 |
Total assets | (1,911,062) | (1,571,075) | (1,911,062) | (1,571,075) |
Capital expenditures | $ 363 | $ 328 | $ 507 | $ 393 |

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