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Segment Disclosures - Summary of Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 199,023 | $ 224,249 | $ 232,641 | $ 266,090 | $ 195,142 | $ 207,723 | $ 211,016 | $ 241,459 | $ 922,003 | $ 855,340 | $ 799,832
Operating expenses | 181,824 | 198,607 | 205,102 | 204,750 | 189,975 | 184,723 | 188,120 | 192,766 | 790,283 | 755,584 | 697,726
Gross margin | 17,199 | 25,642 | 27,539 | 61,340 | 5,167 | 23,000 | 22,896 | 48,693 | 131,720 | 99,756 | 102,106
Corporate general and administrative expenses | 8,873 | 10,279 | 9,993 | 10,028 | 7,316 | 7,979 | 9,232 | 8,768 | 39,173 | 33,295 | 36,319
Operating income (loss) | 8,326 | 15,363 | 17,546 | 51,312 | (2,149) | 15,021 | 13,664 | 39,925 | 92,547 | 66,461 | 65,787
Other (expense) income: |  |  |  |  |  |  |  |  |  |  |
Interest expense | (1,434) | (1,614) | (1,817) | (1,780) | (1,689) | (1,777) | (1,692) | (1,517) | (6,645) | (6,675) | (6,593)
Gain on sale of operations, net | 362 |  |  | 663 |  |  | 23 | 22 | 1,025 | 45 | 855
Other (expense) income, net | (9,631) | 3,143 | 630 | (1,229) | 5,196 | 2,792 | 3,764 | 2,737 | (7,087) | 14,489 | 6,957
Total other (expense) income, net | (10,703) | 1,529 | (1,187) | (2,346) | 3,507 | 1,015 | 2,095 | 1,242 | (12,707) | 7,859 | 1,219
Income from continuing operations before income tax expense | $ (2,377) | $ 16,892 | $ 16,359 | $ 48,966 | $ 1,358 | $ 16,036 | $ 15,759 | $ 41,167 | 79,840 | 74,320 | 67,006
Operating Segments [Member] | Financial Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 600,926 | 540,315 | 501,307
Operating expenses |  |  |  |  |  |  |  |  | 508,653 | 468,089 | 432,254
Gross margin |  |  |  |  |  |  |  |  | 92,273 | 72,226 | 69,053
Operating income (loss) |  |  |  |  |  |  |  |  | 92,273 | 72,226 | 69,053
Other (expense) income: |  |  |  |  |  |  |  |  |  |  |
Other (expense) income, net |  |  |  |  |  |  |  |  | (263) | 158 | 209
Total other (expense) income, net |  |  |  |  |  |  |  |  | (263) | 158 | 209
Income from continuing operations before income tax expense |  |  |  |  |  |  |  |  | 92,010 | 72,384 | 69,262
Operating Segments [Member] | Benefits and Insurance Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 288,437 | 283,909 | 267,606
Operating expenses |  |  |  |  |  |  |  |  | 239,646 | 236,317 | 223,487
Gross margin |  |  |  |  |  |  |  |  | 48,791 | 47,592 | 44,119
Operating income (loss) |  |  |  |  |  |  |  |  | 48,791 | 47,592 | 44,119
Other (expense) income: |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | (102) | (36) | (39)
Other (expense) income, net |  |  |  |  |  |  |  |  | 493 | 442 | 367
Total other (expense) income, net |  |  |  |  |  |  |  |  | 391 | 406 | 328
Income from continuing operations before income tax expense |  |  |  |  |  |  |  |  | 49,182 | 47,998 | 44,447
Operating Segments [Member] | National Practices [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 32,640 | 31,116 | 30,919
Operating expenses |  |  |  |  |  |  |  |  | 30,003 | 28,382 | 27,697
Gross margin |  |  |  |  |  |  |  |  | 2,637 | 2,734 | 3,222
Operating income (loss) |  |  |  |  |  |  |  |  | 2,637 | 2,734 | 3,222
Other (expense) income: |  |  |  |  |  |  |  |  |  |  |
Other (expense) income, net |  |  |  |  |  |  |  |  | 3 | (8) | 3
Total other (expense) income, net |  |  |  |  |  |  |  |  | 3 | (8) | 3
Income from continuing operations before income tax expense |  |  |  |  |  |  |  |  | 2,640 | 2,726 | 3,225
Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  | 11,981 | 22,796 | 14,288
Gross margin |  |  |  |  |  |  |  |  | (11,981) | (22,796) | (14,288)
Corporate general and administrative expenses |  |  |  |  |  |  |  |  | 39,173 | 33,295 | 36,319
Operating income (loss) |  |  |  |  |  |  |  |  | (51,154) | (56,091) | (50,607)
Other (expense) income: |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | (6,543) | (6,639) | (6,554)
Gain on sale of operations, net |  |  |  |  |  |  |  |  | 1,025 | 45 | 855
Other (expense) income, net |  |  |  |  |  |  |  |  | (7,320) | 13,897 | 6,378
Total other (expense) income, net |  |  |  |  |  |  |  |  | (12,838) | 7,303 | 679
Income from continuing operations before income tax expense |  |  |  |  |  |  |  |  | $ (63,992) | $ (48,788) | $ (49,928)

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