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Segment Disclosures - Summary of Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 178,785 | $ 199,794 | $ 197,015 | $ 224,238 | $ 164,412 |  | $ 187,102 |  | $ 185,042 |  | $ 213,866 |  | $ 799,832 | $ 750,422 |  | $ 719,483
Operating expenses | 171,544 | 174,069 | 173,996 | 178,117 | 159,914 | [1] | 158,496 | [1] | 163,117 | [1] | 170,864 | [1] | 697,726 | 652,391 | [2] | 629,804
Gross margin | 7,241 | 25,725 | 23,019 | 46,121 | 4,498 |  | 28,606 |  | 21,925 |  | 43,002 |  | 102,106 | 98,031 |  | 89,679
Corporate general and administrative expenses | 9,049 | 8,679 | 8,346 | 10,245 | 8,019 | [1] | 8,028 | [1] | 6,615 | [1] | 9,865 | [1] | 36,319 | 32,527 | [2] | 34,183
Operating income (loss) | (1,808) | 17,046 | 14,673 | 35,876 | (3,521) |  | 20,578 |  | 15,310 |  | 33,137 |  | 65,787 | 65,504 |  | 55,496
Other income (expense): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | (6,593) | (8,902) |  | (13,124)
Gain on sale of operations, net | 375 | 329 | 50 | 101 | (22) |  | 5 |  | 45 |  | 56 |  | 855 | 84 |  | 1,303
Other income, net | 1,475 | 2,632 | 703 | 2,147 | 1,780 | [1] | (2,367) | [1] | (1,126) | [1] | 2,859 | [1] | 6,957 | 1,146 | [2] | 6,893
Total other income (expense), net | $ 276 | $ 1,201 | $ (980) | $ 722 | $ 521 |  | $ (4,202) |  | $ (3,929) |  | $ (62) |  | 1,219 | (7,672) |  | (4,928)
Income from continuing operations before income tax expense |  |  |  |  |  |  |  |  |  |  |  |  | 67,006 | 57,832 |  | 50,568
Operating Segments [Member] | Financial Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 501,307 | 476,396 |  | 465,130
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 432,254 | 411,325 | [2] | 399,783
Gross margin |  |  |  |  |  |  |  |  |  |  |  |  | 69,053 | 65,071 |  | 65,347
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | 69,053 | 65,071 |  | 65,347
Other income (expense): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income, net |  |  |  |  |  |  |  |  |  |  |  |  | 209 | (147) | [2] | 417
Total other income (expense), net |  |  |  |  |  |  |  |  |  |  |  |  | 209 | (147) |  | 417
Income from continuing operations before income tax expense |  |  |  |  |  |  |  |  |  |  |  |  | 69,262 | 64,924 |  | 65,764
Operating Segments [Member] | Benefits and Insurance Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 267,606 | 244,493 |  | 224,898
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 223,487 | 202,138 | [2] | 186,002
Gross margin |  |  |  |  |  |  |  |  |  |  |  |  | 44,119 | 42,355 |  | 38,896
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | 44,119 | 42,355 |  | 38,896
Other income (expense): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | (39) | (35) |  | (31)
Other income, net |  |  |  |  |  |  |  |  |  |  |  |  | 367 | 467 | [2] | 557
Total other income (expense), net |  |  |  |  |  |  |  |  |  |  |  |  | 328 | 432 |  | 526
Income from continuing operations before income tax expense |  |  |  |  |  |  |  |  |  |  |  |  | 44,447 | 42,787 |  | 39,422
Operating Segments [Member] | National Practices [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 30,919 | 29,533 |  | 29,455
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 27,697 | 26,417 | [2] | 26,798
Gross margin |  |  |  |  |  |  |  |  |  |  |  |  | 3,222 | 3,116 |  | 2,657
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | 3,222 | 3,116 |  | 2,657
Other income (expense): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income, net |  |  |  |  |  |  |  |  |  |  |  |  | 3 | 4 | [2] | 4
Total other income (expense), net |  |  |  |  |  |  |  |  |  |  |  |  | 3 | 4 |  | 4
Income from continuing operations before income tax expense |  |  |  |  |  |  |  |  |  |  |  |  | 3,225 | 3,120 |  | 2,661
Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 14,288 | 12,511 | [2] | 17,221
Gross margin |  |  |  |  |  |  |  |  |  |  |  |  | (14,288) | (12,511) |  | (17,221)
Corporate general and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  | 36,319 | 32,527 | [2] | 34,183
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | (50,607) | (45,038) |  | (51,404)
Other income (expense): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | (6,554) | (8,867) |  | (13,093)
Gain on sale of operations, net |  |  |  |  |  |  |  |  |  |  |  |  | 855 | 84 |  | 1,303
Other income, net |  |  |  |  |  |  |  |  |  |  |  |  | 6,378 | 822 | [2] | 5,915
Total other income (expense), net |  |  |  |  |  |  |  |  |  |  |  |  | 679 | (7,961) |  | (5,875)
Income from continuing operations before income tax expense |  |  |  |  |  |  |  |  |  |  |  |  | $ (49,928) | $ (52,999) |  | $ (57,279)
[1] | “Operating expenses” and “Corporate general and administrative expenses” include a reduction ($1.6 million and less than $0.1 million) related to a state payroll tax incentive associated with an office relocation. The reduction was recorded in “Other (expense) income, net” beginning in the third quarter of 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.
[2] | “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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