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Segment Information - Summarized Financial Information Reportable Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | $ 475,646 | $ 462,274 | $ 1,407,031 | $ 1,332,965 |
Investment income | 491 | 230 | 1,085 | 1,150 |
Amortization | 21,435 | 21,805 | 64,402 | 65,025 |
Depreciation | 5,489 | 5,195 | 17,242 | 15,867 |
Interest expense | 9,393 | 9,883 | 28,949 | 29,617 |
Income before income taxes | 124,419 | 116,972 | 343,388 | 328,598 |
Total assets | 7,414,277 | 5,522,027 | 7,414,277 | 5,522,027 | $ 5,262,734
Capital expenditures | 4,049 | 4,191 | 12,897 | 13,135 |
Operating Segments | Services |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 234,483 | 228,645 | 712,739 | 695,393 |
Investment income | 3 | 5 | 6 | 33 |
Amortization | 10,540 | 10,861 | 31,704 | 32,743 |
Depreciation | 1,262 | 1,508 | 3,975 | 4,761 |
Interest expense | 7,216 | 9,026 | 23,918 | 29,415 |
Income before income taxes | 54,950 | 44,894 | 151,783 | 144,496 |
Total assets | 4,246,422 | 3,652,977 | 4,246,422 | 3,652,977 |
Capital expenditures | 844 | 1,443 | 3,384 | 4,664 |
Operating Segments | National Programs |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 127,718 | 123,632 | 342,576 | 333,522 |
Investment income | 124 | 96 | 279 | 583 |
Amortization | 6,913 | 6,921 | 20,664 | 21,011 |
Depreciation | 1,412 | 1,945 | 4,975 | 5,881 |
Interest expense | 8,304 | 10,844 | 27,257 | 34,895 |
Income before income taxes | 32,203 | 32,319 | 68,127 | 68,367 |
Total assets | 5,026,918 | 2,933,568 | 5,026,918 | 2,933,568 |
Capital expenditures | 1,357 | 2,153 | 3,885 | 5,399 |
Operating Segments | Wholesale Brokerage |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 71,574 | 70,192 | 208,812 | 184,893 |
Investment income | 0 | 0 | 0 | 4 |
Amortization | 2,845 | 2,882 | 8,621 | 7,915 |
Depreciation | 471 | 503 | 1,438 | 1,487 |
Interest expense | 1,515 | 1,540 | 4,803 | 2,472 |
Income before income taxes | 21,219 | 20,862 | 56,569 | 51,711 |
Total assets | 1,258,783 | 1,053,516 | 1,258,783 | 1,053,516 |
Capital expenditures | 214 | 11 | 1,606 | 925 |
Operating Segments | Services |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 41,491 | 39,586 | 122,397 | 117,906 |
Investment income | 72 | 57 | 224 | 204 |
Amortization | 1,137 | 1,140 | 3,412 | 3,345 |
Depreciation | 402 | 473 | 1,191 | 1,432 |
Interest expense | 876 | 1,257 | 2,783 | 3,820 |
Income before income taxes | 7,910 | 5,971 | 22,480 | 17,929 |
Total assets | 432,331 | 342,360 | 432,331 | 342,360 |
Capital expenditures | 364 | 80 | 856 | 561 |
Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 380 | 219 | 20,507 | 1,251 |
Investment income | 292 | 72 | 576 | 326 |
Amortization | 0 | 1 | 1 | 11 |
Depreciation | 1,942 | 766 | 5,663 | 2,306 |
Interest expense | (8,518) | (12,784) | (29,812) | (40,985) |
Income before income taxes | 8,137 | 12,926 | 44,429 | 46,095 |
Total assets | (3,550,177) | (2,460,394) | (3,550,177) | (2,460,394) |
Capital expenditures | $ 1,270 | $ 504 | $ 3,166 | $ 1,586 |

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