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Segment Disclosures - Summary of Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 203,138 | $ 239,790 | $ 235,498 | $ 269,998 | $ 199,023 | $ 224,249 | $ 232,641 | $ 266,090 | $ 948,424 | $ 922,003 | $ 855,340
Operating expenses | 200,706 | 209,146 | 198,148 | 215,496 | 181,824 | 198,607 | 205,102 | 204,750 | 823,496 | 790,283 | 755,584
Gross margin | 2,432 | 30,644 | 37,350 | 54,502 | 17,199 | 25,642 | 27,539 | 61,340 | 124,928 | 131,720 | 99,756
Corporate general and administrative expenses | 10,490 | 11,670 | 10,566 | 11,680 | 8,873 | 10,279 | 9,993 | 10,028 | 44,406 | 39,173 | 33,295
Operating income | (8,058) | 18,974 | 26,784 | 42,822 | 8,326 | 15,363 | 17,546 | 51,312 | 80,522 | 92,547 | 66,461
Other (expense) income: |  |  |  |  |  |  |  |  |  |  |
Interest expense | (1,256) | (1,521) | (1,587) | (1,401) | (1,434) | (1,614) | (1,817) | (1,780) | (5,765) | (6,645) | (6,675)
Gain on sale of operations, net | 15 | (145) | 50 | 497 | 362 |  |  | 663 | 417 | 1,025 | 45
Other (expense) income, net | 4,999 | 6,767 | (3,311) | 9,260 | (9,631) | 3,143 | 630 | (1,229) | 17,715 | (7,087) | 14,489
Total other income (expense), net | 3,758 | 5,101 | (4,848) | 8,356 | (10,703) | 1,529 | (1,187) | (2,346) | 12,367 | (12,707) | 7,859
Income from continuing operations before income tax expense | $ (4,300) | $ 24,075 | $ 21,936 | $ 51,178 | $ (2,377) | $ 16,892 | $ 16,359 | $ 48,966 | 92,889 | 79,840 | 74,320
Financial Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 616,567 | 600,926 |
Benefits and Insurance Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 296,228 | 288,437 |
National Practices [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 35,629 | 32,640 |
Operating Segments [Member] | Financial Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 616,567 | 600,926 | 540,315
Operating expenses |  |  |  |  |  |  |  |  | 515,240 | 508,653 | 468,089
Gross margin |  |  |  |  |  |  |  |  | 101,327 | 92,273 | 72,226
Operating income |  |  |  |  |  |  |  |  | 101,327 | 92,273 | 72,226
Other (expense) income: |  |  |  |  |  |  |  |  |  |  |
Gain on sale of operations, net |  |  |  |  |  |  |  |  | 578 |  |
Other (expense) income, net |  |  |  |  |  |  |  |  | (121) | (263) | 158
Total other income (expense), net |  |  |  |  |  |  |  |  | 457 | (263) | 158
Income from continuing operations before income tax expense |  |  |  |  |  |  |  |  | 101,784 | 92,010 | 72,384
Operating Segments [Member] | Benefits and Insurance Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 296,228 | 288,437 | 283,909
Operating expenses |  |  |  |  |  |  |  |  | 246,245 | 239,646 | 236,317
Gross margin |  |  |  |  |  |  |  |  | 49,983 | 48,791 | 47,592
Operating income |  |  |  |  |  |  |  |  | 49,983 | 48,791 | 47,592
Other (expense) income: |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | (57) | (102) | (36)
Other (expense) income, net |  |  |  |  |  |  |  |  | 238 | 493 | 442
Total other income (expense), net |  |  |  |  |  |  |  |  | 181 | 391 | 406
Income from continuing operations before income tax expense |  |  |  |  |  |  |  |  | 50,164 | 49,182 | 47,998
Operating Segments [Member] | National Practices [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 35,629 | 32,640 | 31,116
Operating expenses |  |  |  |  |  |  |  |  | 32,474 | 30,003 | 28,382
Gross margin |  |  |  |  |  |  |  |  | 3,155 | 2,637 | 2,734
Operating income |  |  |  |  |  |  |  |  | 3,155 | 2,637 | 2,734
Other (expense) income: |  |  |  |  |  |  |  |  |  |  |
Other (expense) income, net |  |  |  |  |  |  |  |  | 1 | 3 | (8)
Total other income (expense), net |  |  |  |  |  |  |  |  | 1 | 3 | (8)
Income from continuing operations before income tax expense |  |  |  |  |  |  |  |  | 3,156 | 2,640 | 2,726
Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  | 29,537 | 11,981 | 22,796
Gross margin |  |  |  |  |  |  |  |  | (29,537) | (11,981) | (22,796)
Corporate general and administrative expenses |  |  |  |  |  |  |  |  | 44,406 | 39,173 | 33,295
Operating income |  |  |  |  |  |  |  |  | (73,943) | (51,154) | (56,091)
Other (expense) income: |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | (5,708) | (6,543) | (6,639)
Gain on sale of operations, net |  |  |  |  |  |  |  |  | (161) | 1,025 | 45
Other (expense) income, net |  |  |  |  |  |  |  |  | 17,597 | (7,320) | 13,897
Total other income (expense), net |  |  |  |  |  |  |  |  | 11,728 | (12,838) | 7,303
Income from continuing operations before income tax expense |  |  |  |  |  |  |  |  | $ (62,215) | $ (63,992) | $ (48,788)

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