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Segment Disclosures - Summary of Segment Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 172,511 | $ 154,206 | $ 373,945 | $ 341,762
Operating expenses | 151,627 | 136,013 | 311,625 | 285,579
Gross margin | 20,884 | 18,193 | 62,320 | 56,183
Corporate general & admin | 7,649 | 7,575 | 17,633 | 18,119
Operating income (loss) | 13,235 | 10,618 | 44,687 | 38,064
Interest expense | (4,145) | (3,831) | (8,201) | (7,622)
Gain on sale of operations, net | 48 | 50 | 66 | 2,639
Other income (expense), net | 515 | (884) | 2,243 | 2,481
Total other income (expense) | (3,582) | (4,665) | (5,892) | (2,502)
Income (loss) from continuing operations before income tax expense | 9,653 | 5,953 | 38,795 | 35,562
Financial Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 113,808 | 101,336 | 254,978 | 233,500
Operating expenses | 99,229 | 89,131 | 204,744 | 186,364
Gross margin | 14,579 | 12,205 | 50,234 | 47,136
Operating income (loss) | 14,579 | 12,205 | 50,234 | 47,136
Other income (expense), net | 339 | 66 | 376 | 96
Total other income (expense) | 339 | 66 | 376 | 96
Income (loss) from continuing operations before income tax expense | 14,918 | 12,271 | 50,610 | 47,232
Employee Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 51,489 | 45,609 | 104,267 | 93,668
Operating expenses | 42,868 | 38,520 | 85,490 | 77,968
Gross margin | 8,621 | 7,089 | 18,777 | 15,700
Operating income (loss) | 8,621 | 7,089 | 18,777 | 15,700
Interest expense | (1) | (6) | (8) | (12)
Other income (expense), net | 74 | 77 | 175 | 193
Total other income (expense) | 73 | 71 | 167 | 181
Income (loss) from continuing operations before income tax expense | 8,694 | 7,160 | 18,944 | 15,881
National Practices [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 7,214 | 7,261 | 14,700 | 14,594
Operating expenses | 6,875 | 6,659 | 13,825 | 13,381
Gross margin | 339 | 602 | 875 | 1,213
Operating income (loss) | 339 | 602 | 875 | 1,213
Income (loss) from continuing operations before income tax expense | 339 | 602 | 875 | 1,213
Corporate and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating expenses | 2,655 | 1,703 | 7,566 | 7,866
Gross margin | (2,655) | (1,703) | (7,566) | (7,866)
Corporate general & admin | 7,649 | 7,575 | 17,633 | 18,119
Operating income (loss) | (10,304) | (9,278) | (25,199) | (25,985)
Interest expense | (4,144) | (3,825) | (8,193) | (7,610)
Gain on sale of operations, net | 48 | 50 | 66 | 2,639
Other income (expense), net | 102 | (1,027) | 1,692 | 2,192
Total other income (expense) | (3,994) | (4,802) | (6,435) | (2,779)
Income (loss) from continuing operations before income tax expense | $ (14,298) | $ (14,080) | $ (31,634) | $ (28,764)

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