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Segment Disclosures - Summary of Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 195,142 | $ 207,723 | $ 211,016 | $ 241,459 | $ 178,785 | $ 199,794 | $ 197,015 | $ 224,238 | $ 855,340 | $ 799,832 | $ 750,422 |
Operating expenses | 189,975 | 184,723 | 188,120 | 192,766 | 171,544 | 174,069 | 173,996 | 178,117 | 755,584 | 697,726 | 652,391 | [1]
Gross margin | 5,167 | 23,000 | 22,896 | 48,693 | 7,241 | 25,725 | 23,019 | 46,121 | 99,756 | 102,106 | 98,031 |
Corporate general and administrative expenses | 7,316 | 7,979 | 9,232 | 8,768 | 9,049 | 8,679 | 8,346 | 10,245 | 33,295 | 36,319 | 32,527 | [1]
Operating income (loss) | (2,149) | 15,021 | 13,664 | 39,925 | (1,808) | 17,046 | 14,673 | 35,876 | 66,461 | 65,787 | 65,504 |
Other income (expense): |  |  |  |  |  |  |  |  |  |  |  |
Interest expense | (1,689) | (1,777) | (1,692) | (1,517) | (1,574) | (1,760) | (1,733) | (1,526) | (6,675) | (6,593) | (8,902) |
Gain on sale of operations, net |  |  | 23 | 22 | 375 | 329 | 50 | 101 | 45 | 855 | 84 |
Other income, net | 5,196 | 2,792 | 3,764 | 2,737 | 1,475 | 2,632 | 703 | 2,147 | 14,489 | 6,957 | 1,146 | [1]
Total other income (expense), net | 3,507 | 1,015 | 2,095 | 1,242 | 276 | 1,201 | (980) | 722 | 7,859 | 1,219 | (7,672) |
Income from continuing operations before income tax expense | $ 1,358 | $ 16,036 | $ 15,759 | $ 41,167 | $ (1,532) | $ 18,247 | $ 13,693 | $ 36,598 | 74,320 | 67,006 | 57,832 |
Operating Segments [Member] | Financial Services [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 540,315 | 501,307 | 476,396 |
Operating expenses |  |  |  |  |  |  |  |  | 468,089 | 432,254 | 411,325 | [1]
Gross margin |  |  |  |  |  |  |  |  | 72,226 | 69,053 | 65,071 |
Operating income (loss) |  |  |  |  |  |  |  |  | 72,226 | 69,053 | 65,071 |
Other income (expense): |  |  |  |  |  |  |  |  |  |  |  |
Other income, net |  |  |  |  |  |  |  |  | 158 | 209 | (147) | [1]
Total other income (expense), net |  |  |  |  |  |  |  |  | 158 | 209 | (147) |
Income from continuing operations before income tax expense |  |  |  |  |  |  |  |  | 72,384 | 69,262 | 64,924 |
Operating Segments [Member] | Benefits and Insurance Services [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 283,909 | 267,606 | 244,493 |
Operating expenses |  |  |  |  |  |  |  |  | 236,317 | 223,487 | 202,138 | [1]
Gross margin |  |  |  |  |  |  |  |  | 47,592 | 44,119 | 42,355 |
Operating income (loss) |  |  |  |  |  |  |  |  | 47,592 | 44,119 | 42,355 |
Other income (expense): |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | (36) | (39) | (35) |
Other income, net |  |  |  |  |  |  |  |  | 442 | 367 | 467 | [1]
Total other income (expense), net |  |  |  |  |  |  |  |  | 406 | 328 | 432 |
Income from continuing operations before income tax expense |  |  |  |  |  |  |  |  | 47,998 | 44,447 | 42,787 |
Operating Segments [Member] | National Practices [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 31,116 | 30,919 | 29,533 |
Operating expenses |  |  |  |  |  |  |  |  | 28,382 | 27,697 | 26,417 | [1]
Gross margin |  |  |  |  |  |  |  |  | 2,734 | 3,222 | 3,116 |
Operating income (loss) |  |  |  |  |  |  |  |  | 2,734 | 3,222 | 3,116 |
Other income (expense): |  |  |  |  |  |  |  |  |  |  |  |
Other income, net |  |  |  |  |  |  |  |  | (8) | 3 | 4 | [1]
Total other income (expense), net |  |  |  |  |  |  |  |  | (8) | 3 | 4 |
Income from continuing operations before income tax expense |  |  |  |  |  |  |  |  | 2,726 | 3,225 | 3,120 |
Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  | 22,796 | 14,288 | 12,511 | [1]
Gross margin |  |  |  |  |  |  |  |  | (22,796) | (14,288) | (12,511) |
Corporate general and administrative expenses |  |  |  |  |  |  |  |  | 33,295 | 36,319 | 32,527 | [1]
Operating income (loss) |  |  |  |  |  |  |  |  | (56,091) | (50,607) | (45,038) |
Other income (expense): |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | (6,639) | (6,554) | (8,867) |
Gain on sale of operations, net |  |  |  |  |  |  |  |  | 45 | 855 | 84 |
Other income, net |  |  |  |  |  |  |  |  | 13,897 | 6,378 | 822 | [1]
Total other income (expense), net |  |  |  |  |  |  |  |  | 7,303 | 679 | (7,961) |
Income from continuing operations before income tax expense |  |  |  |  |  |  |  |  | $ (48,788) | $ (49,928) | $ (52,999) |
[1] | “Operating expenses” under the Financial Services and Benefits and Insurance Services practice groups include a reduction of $0.9 million and $0.6 million related to a state payroll tax incentive associated with an office relocation. “Corporate general and administrative expenses” include a reduction of less than $0.1 million related to the office relocation as discussed above. The reductions was recorded in “Other (expense) income, net” in 2015 but was reclassified to “Operating expenses” and “Corporate general and administrative expenses” to align the incentives with the expenses associated with the office relocation. The reclassification had no impact on “Income from continuing operations” or diluted earnings per share from continuing operations.

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