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Segment Disclosures - Summary of Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 211,016 | $ 197,015 | $ 452,475 | $ 421,253
Operating expenses | 188,120 | 173,996 | 380,886 | 352,113
Gross margin | 22,896 | 23,019 | 71,589 | 69,140
Corporate general & admin | 9,232 | 8,346 | 18,000 | 18,591
Operating income | 13,664 | 14,673 | 53,589 | 50,549
Other income (expense): |  |  |  |
Interest expense | (1,692) | (1,733) | (3,209) | (3,259)
Gain on sale of operations, net | 23 | 50 | 45 | 151
Other income, net | 3,764 | 703 | 6,501 | 2,850
Total other income (expense), net | 2,095 | (980) | 3,337 | (258)
Income from continuing operations before income tax expense | 15,759 | 13,693 | 56,926 | 50,291
Operating Segments [Member] | Financial Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 132,591 | 122,856 | 291,224 | 275,063
Operating expenses | 115,851 | 106,987 | 235,240 | 220,484
Gross margin | 16,740 | 15,869 | 55,984 | 54,579
Operating income | 16,740 | 15,869 | 55,984 | 54,579
Other income (expense): |  |  |  |
Other income, net | 28 | (27) | 43 | 227
Total other income (expense), net | 28 | (27) | 43 | 227
Income from continuing operations before income tax expense | 16,768 | 15,842 | 56,027 | 54,806
Operating Segments [Member] | Benefits and Insurance Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 70,559 | 66,484 | 145,723 | 130,811
Operating expenses | 59,877 | 56,344 | 120,019 | 110,024
Gross margin | 10,682 | 10,140 | 25,704 | 20,787
Operating income | 10,682 | 10,140 | 25,704 | 20,787
Other income (expense): |  |  |  |
Interest expense | (9) | (10) | (20) | (20)
Other income, net | 120 | 84 | 216 | 158
Total other income (expense), net | 111 | 74 | 196 | 138
Income from continuing operations before income tax expense | 10,793 | 10,214 | 25,900 | 20,925
Operating Segments [Member] | National Practices [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 7,866 | 7,675 | 15,528 | 15,379
Operating expenses | 7,235 | 7,005 | 14,242 | 13,882
Gross margin | 631 | 670 | 1,286 | 1,497
Operating income | 631 | 670 | 1,286 | 1,497
Other income (expense): |  |  |  |
Other income, net | (9) | 1 | (9) | 1
Total other income (expense), net | (9) | 1 | (9) | 1
Income from continuing operations before income tax expense | 622 | 671 | 1,277 | 1,498
Corporate and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating expenses | 5,157 | 3,660 | 11,385 | 7,723
Gross margin | (5,157) | (3,660) | (11,385) | (7,723)
Corporate general & admin | 9,232 | 8,346 | 18,000 | 18,591
Operating income | (14,389) | (12,006) | (29,385) | (26,314)
Other income (expense): |  |  |  |
Interest expense | (1,683) | (1,723) | (3,189) | (3,239)
Gain on sale of operations, net | 23 | 50 | 45 | 151
Other income, net | 3,625 | 645 | 6,251 | 2,464
Total other income (expense), net | 1,965 | (1,028) | 3,107 | (624)
Income from continuing operations before income tax expense | $ (12,424) | $ (13,034) | $ (26,278) | $ (26,938)

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