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Segment Information - Summarized Financial Information Reportable Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Total revenues | $ 424,173 | $ 404,298 |
Investment income | 418 | 220 |
Amortization | 21,610 | 21,625 |
Depreciation | 5,318 | 5,183 |
Interest expense | 9,897 | 9,851 |
Income before income taxes | 102,549 | 93,778 |
Total assets | 4,992,960 | 4,838,942 | $ 5,004,479
Capital expenditures | 4,252 | 3,727 |
Operating Segments | Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 232,188 | 218,344 |
Investment income | 21 | 22 |
Amortization | 10,989 | 10,934 |
Depreciation | 1,637 | 1,642 |
Interest expense | 10,403 | 10,158 |
Income before income taxes | 50,452 | 47,009 |
Total assets | 3,531,100 | 3,305,917 |
Capital expenditures | 1,049 | 1,424 |
Operating Segments | National Programs |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 101,070 | 99,555 |
Investment income | 248 | 45 |
Amortization | 7,108 | 7,235 |
Depreciation | 1,929 | 1,766 |
Interest expense | 12,590 | 14,955 |
Income before income taxes | 13,803 | 9,476 |
Total assets | 2,499,870 | 2,407,695 |
Capital expenditures | 1,932 | 1,489 |
Operating Segments | Wholesale Brokerage |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 53,414 | 51,828 |
Investment income | 3 | 72 |
Amortization | 2,442 | 2,423 |
Depreciation | 496 | 563 |
Interest expense | 247 | 229 |
Income before income taxes | 14,562 | 14,484 |
Total assets | 888,745 | 858,149 |
Capital expenditures | 592 | 451 |
Operating Segments | Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 36,568 | 34,788 |
Investment income | 64 | 0 |
Amortization | 1,065 | 1,023 |
Depreciation | 487 | 530 |
Interest expense | 1,236 | 1,599 |
Income before income taxes | 5,052 | 4,502 |
Total assets | 324,269 | 300,155 |
Capital expenditures | 205 | 240 |
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 933 | (217) |
Investment income | 82 | 81 |
Amortization | 6 | 10 |
Depreciation | 769 | 682 |
Interest expense | (14,579) | (17,090) |
Income before income taxes | 18,680 | 18,307 |
Total assets | (2,251,024) | (2,032,974) |
Capital expenditures | $ 474 | $ 123 |

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