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Segment Disclosures - Summary of Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 197,015 | $ 185,042 | $ 421,253 | $ 398,908
Operating expenses | 173,996 | 163,117 | 352,113 | 333,981
Gross margin | 23,019 | 21,925 | 69,140 | 64,927
Corporate general & admin | 8,346 | 6,615 | 18,591 | 16,480
Operating income | 14,673 | 15,310 | 50,549 | 48,447
Other income (expense): |  |  |  |
Interest expense | (1,733) | (2,848) | (3,259) | (5,825)
Gain on sale of operations, net | 50 | 45 | 151 | 101
Other (expense) income, net | 703 | (1,126) | 2,850 | 1,733
Total other expense, net | (980) | (3,929) | (258) | (3,991)
Income from continuing operations before income tax expense | 13,693 | 11,381 | 50,291 | 44,456
Operating Segments [Member] | Financial Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 122,856 | 116,671 | 275,063 | 260,503
Operating expenses | 106,987 | 102,345 | 220,484 | 210,963
Gross margin | 15,869 | 14,326 | 54,579 | 49,540
Operating income | 15,869 | 14,326 | 54,579 | 49,540
Other income (expense): |  |  |  |
Other (expense) income, net | (27) | 8 | 227 | 107
Total other expense, net | (27) | 8 | 227 | 107
Income from continuing operations before income tax expense | 15,842 | 14,334 | 54,806 | 49,647
Operating Segments [Member] | Employee Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 66,484 | 61,024 | 130,811 | 123,675
Operating expenses | 56,344 | 51,242 | 110,024 | 102,770
Gross margin | 10,140 | 9,782 | 20,787 | 20,905
Operating income | 10,140 | 9,782 | 20,787 | 20,905
Other income (expense): |  |  |  |
Interest expense | (10) | (11) | (20) | (20)
Other (expense) income, net | 84 | 82 | 158 | 199
Total other expense, net | 74 | 71 | 138 | 179
Income from continuing operations before income tax expense | 10,214 | 9,853 | 20,925 | 21,084
Operating Segments [Member] | National Practices [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 7,675 | 7,347 | 15,379 | 14,730
Operating expenses | 7,005 | 6,649 | 13,882 | 13,250
Gross margin | 670 | 698 | 1,497 | 1,480
Operating income | 670 | 698 | 1,497 | 1,480
Other income (expense): |  |  |  |
Other (expense) income, net | 1 | 1 | 1 | 1
Total other expense, net | 1 | 1 | 1 | 1
Income from continuing operations before income tax expense | 671 | 699 | 1,498 | 1,481
Corporate and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating expenses | 3,660 | 2,881 | 7,723 | 6,998
Gross margin | (3,660) | (2,881) | (7,723) | (6,998)
Corporate general & admin | 8,346 | 6,615 | 18,591 | 16,480
Operating income | (12,006) | (9,496) | (26,314) | (23,478)
Other income (expense): |  |  |  |
Interest expense | (1,723) | (2,837) | (3,239) | (5,805)
Gain on sale of operations, net | 50 | 45 | 151 | 101
Other (expense) income, net | 645 | (1,217) | 2,464 | 1,426
Total other expense, net | (1,028) | (4,009) | (624) | (4,278)
Income from continuing operations before income tax expense | $ (13,034) | $ (13,505) | $ (26,938) | $ (27,756)

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