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Segment Disclosures - Summary of Segment Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 183,799 | $ 168,779 | $ 573,592 | $ 542,197
Operating expenses | 159,026 | 150,258 | 487,520 | 460,738
Gross margin | 24,773 | 18,521 | 86,072 | 81,459
Corporate general & admin | 8,889 | 8,944 | 27,454 | 26,577
Operating income (loss) | 15,884 | 9,577 | 58,618 | 54,882
Other income (expense): |  |  |  |
Interest expense | (3,123) | (3,815) | (10,133) | (12,016)
Gain on sale of operations, net | 17 | 6 | 93 | 72
Other income (expense), net | (1,368) | 2,371 | 4,543 | 4,614
Total other income (expense) | (4,474) | (1,438) | (5,497) | (7,330)
Income (loss) from continuing operations before income tax expense | 11,410 | 8,139 | 53,121 | 47,552
Financial Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 119,462 | 110,552 | 383,964 | 365,004
Operating expenses | 102,789 | 96,999 | 317,402 | 300,602
Gross margin | 16,673 | 13,553 | 66,562 | 64,402
Operating income (loss) | 16,673 | 13,553 | 66,562 | 64,402
Other income (expense): |  |  |  |
Other income (expense), net | 193 | 74 | 234 | 450
Total other income (expense) | 193 | 74 | 234 | 450
Income (loss) from continuing operations before income tax expense | 16,866 | 13,627 | 66,796 | 64,852
Employee Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 56,891 | 50,415 | 167,479 | 154,681
Operating expenses | 47,194 | 42,055 | 138,865 | 127,545
Gross margin | 9,697 | 8,360 | 28,614 | 27,136
Operating income (loss) | 9,697 | 8,360 | 28,614 | 27,136
Other income (expense): |  |  |  |
Interest expense | (7) | (7) | (23) | (15)
Other income (expense), net | 97 | 63 | 472 | 238
Total other income (expense) | 90 | 56 | 449 | 223
Income (loss) from continuing operations before income tax expense | 9,787 | 8,416 | 29,063 | 27,359
National Practices [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 7,446 | 7,812 | 22,149 | 22,512
Operating expenses | 6,583 | 6,617 | 19,901 | 20,442
Gross margin | 863 | 1,195 | 2,248 | 2,070
Operating income (loss) | 863 | 1,195 | 2,248 | 2,070
Other income (expense): |  |  |  |
Other income (expense), net | 4 | 1 | 4 | 1
Total other income (expense) | 4 | 1 | 4 | 1
Income (loss) from continuing operations before income tax expense | 867 | 1,196 | 2,252 | 2,071
Corporate and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating expenses | 2,460 | 4,587 | 11,352 | 12,149
Gross margin | (2,460) | (4,587) | (11,352) | (12,149)
Corporate general & admin | 8,889 | 8,944 | 27,454 | 26,577
Operating income (loss) | (11,349) | (13,531) | (38,806) | (38,726)
Other income (expense): |  |  |  |
Interest expense | (3,116) | (3,808) | (10,110) | (12,001)
Gain on sale of operations, net | 17 | 6 | 93 | 72
Other income (expense), net | (1,662) | 2,233 | 3,833 | 3,925
Total other income (expense) | (4,761) | (1,569) | (6,184) | (8,004)
Income (loss) from continuing operations before income tax expense | $ (16,110) | $ (15,100) | $ (44,990) | $ (46,730)

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