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Segment Disclosures - Summary of Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 239,790 | $ 224,249 | $ 745,286 | $ 722,980
Operating expenses | 209,146 | 198,607 | 622,790 | 608,459
Gross margin | 30,644 | 25,642 | 122,496 | 114,521
Corporate general & admin | 11,670 | 10,279 | 33,916 | 30,300
Operating income | 18,974 | 15,363 | 88,580 | 84,221
Other income (expense): |  |  |  |
Interest expense | (1,521) | (1,614) | (4,509) | (5,211)
Gain (loss) on sale of operations, net | (145) |  | 402 | 663
Other income (expense), net | 6,767 | 3,143 | 12,716 | 2,544
Total other income (expense), net | 5,101 | 1,529 | 8,609 | (2,004)
Income from continuing operations before income tax expense | 24,075 | 16,892 | 97,189 | 82,217
Financial Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 153,794 | 146,145 | 493,311 | 478,485
Benefits and Insurance Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 76,960 | 70,069 | 225,342 | 220,152
National Practices [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 9,036 | 8,035 | 26,633 | 24,343
Operating Segments [Member] | Financial Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 153,794 | 146,145 | 493,311 | 478,485
Operating expenses | 128,231 | 124,546 | 390,847 | 386,649
Gross margin | 25,563 | 21,599 | 102,464 | 91,836
Operating income | 25,563 | 21,599 | 102,464 | 91,836
Other income (expense): |  |  |  |
Gain (loss) on sale of operations, net | 16 |  | 563 |
Other income (expense), net | 14 | (142) | (188) | 106
Total other income (expense), net | 30 | (142) | 375 | 106
Income from continuing operations before income tax expense | 25,593 | 21,457 | 102,839 | 91,942
Operating Segments [Member] | Benefits and Insurance Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 76,960 | 70,069 | 225,342 | 220,152
Operating expenses | 63,390 | 59,399 | 185,836 | 181,697
Gross margin | 13,570 | 10,670 | 39,506 | 38,455
Operating income | 13,570 | 10,670 | 39,506 | 38,455
Other income (expense): |  |  |  |
Interest expense | (14) | (7) | (38) | (96)
Other income (expense), net | 9 | 129 | 204 | 351
Total other income (expense), net | (5) | 122 | 166 | 255
Income from continuing operations before income tax expense | 13,565 | 10,792 | 39,672 | 38,710
Operating Segments [Member] | National Practices [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 9,036 | 8,035 | 26,633 | 24,343
Operating expenses | 8,104 | 7,514 | 24,308 | 22,356
Gross margin | 932 | 521 | 2,325 | 1,987
Operating income | 932 | 521 | 2,325 | 1,987
Other income (expense): |  |  |  |
Other income (expense), net |  |  | 1 |
Total other income (expense), net |  |  | 1 |
Income from continuing operations before income tax expense | 932 | 521 | 2,326 | 1,987
Corporate and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating expenses | 9,421 | 7,148 | 21,799 | 17,757
Gross margin | (9,421) | (7,148) | (21,799) | (17,757)
Corporate general & admin | 11,670 | 10,279 | 33,916 | 30,300
Operating income | (21,091) | (17,427) | (55,715) | (48,057)
Other income (expense): |  |  |  |
Interest expense | (1,507) | (1,607) | (4,471) | (5,115)
Gain (loss) on sale of operations, net | (161) |  | (161) | 663
Other income (expense), net | 6,744 | 3,156 | 12,699 | 2,087
Total other income (expense), net | 5,076 | 1,549 | 8,067 | (2,365)
Income from continuing operations before income tax expense | $ (16,015) | $ (15,878) | $ (47,648) | $ (50,422)

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