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Segment Disclosures - Summary of Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 224,249 | $ 207,723 | $ 722,980 | $ 660,198
Operating expenses | 198,607 | 184,723 | 608,459 | 565,609
Gross margin | 25,642 | 23,000 | 114,521 | 94,589
Corporate general & admin | 10,279 | 7,979 | 30,300 | 25,979
Operating income (loss) | 15,363 | 15,021 | 84,221 | 68,610
Other (expense) income: |  |  |  |
Interest expense | (1,614) | (1,777) | (5,211) | (4,986)
Gain on sale of operations, net |  |  | 663 | 45
Other income (expense), net | 3,143 | 2,792 | 2,544 | 9,293
Total other income (expense), net | 1,529 | 1,015 | (2,004) | 4,352
Income from continuing operations before income tax expense | 16,892 | 16,036 | 82,217 | 72,962
Financial Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 146,145 |  | 478,485 |
Benefits and Insurance Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 70,069 |  | 220,152 |
National Practices [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 8,035 |  | 24,343 |
Operating Segments [Member] | Financial Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 146,145 | 130,305 | 478,485 | 421,529
Operating expenses | 124,546 | 112,996 | 386,649 | 348,236
Gross margin | 21,599 | 17,309 | 91,836 | 73,293
Operating income (loss) | 21,599 | 17,309 | 91,836 | 73,293
Other (expense) income: |  |  |  |
Other income (expense), net | (142) | 79 | 106 | 122
Total other income (expense), net | (142) | 79 | 106 | 122
Income from continuing operations before income tax expense | 21,457 | 17,388 | 91,942 | 73,415
Operating Segments [Member] | Benefits and Insurance Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 70,069 | 69,663 | 220,152 | 215,386
Operating expenses | 59,399 | 59,155 | 181,697 | 179,174
Gross margin | 10,670 | 10,508 | 38,455 | 36,212
Operating income (loss) | 10,670 | 10,508 | 38,455 | 36,212
Other (expense) income: |  |  |  |
Interest expense | (7) | (10) | (96) | (30)
Other income (expense), net | 129 | 82 | 351 | 298
Total other income (expense), net | 122 | 72 | 255 | 268
Income from continuing operations before income tax expense | 10,792 | 10,580 | 38,710 | 36,480
Operating Segments [Member] | National Practices [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 8,035 | 7,755 | 24,343 | 23,283
Operating expenses | 7,514 | 7,109 | 22,356 | 21,351
Gross margin | 521 | 646 | 1,987 | 1,932
Operating income (loss) | 521 | 646 | 1,987 | 1,932
Other (expense) income: |  |  |  |
Other income (expense), net |  |  |  | (9)
Total other income (expense), net |  |  |  | (9)
Income from continuing operations before income tax expense | 521 | 646 | 1,987 | 1,923
Corporate and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating expenses | 7,148 | 5,463 | 17,757 | 16,848
Gross margin | (7,148) | (5,463) | (17,757) | (16,848)
Corporate general & admin | 10,279 | 7,979 | 30,300 | 25,979
Operating income (loss) | (17,427) | (13,442) | (48,057) | (42,827)
Other (expense) income: |  |  |  |
Interest expense | (1,607) | (1,767) | (5,115) | (4,956)
Gain on sale of operations, net |  |  | 663 | 45
Other income (expense), net | 3,156 | 2,631 | 2,087 | 8,882
Total other income (expense), net | 1,549 | 864 | (2,365) | 3,971
Income from continuing operations before income tax expense | $ (15,878) | $ (12,578) | $ (50,422) | $ (38,856)

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