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Segment Disclosures - Summary of Segment Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Segment Reporting Information [Line Items] |  |
Revenue | $ 208,908 | $ 201,189
Operating expenses | 166,187 | 159,389
Gross margin | 42,721 | 41,800
Corporate general & admin | 10,259 | 9,984
Operating income (loss) | 32,462 | 31,816
Other income (expense): |  |
Interest expense | (3,433) | (4,056)
Gain on sale of operations, net | 8 | 18
Other income, net | 1,975 | 1,728
Total other income (expense) | (1,450) | (2,310)
Income (loss) from continuing operations before income tax expense | 31,012 | 29,506
Financial Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue | 145,420 | 140,925
Operating expenses | 110,022 | 104,882
Gross margin | 35,398 | 36,043
Corporate general & admin |  |
Operating income (loss) | 35,398 | 36,043
Other income (expense): |  |
Interest expense |  |
Gain on sale of operations, net |  |
Other income, net | 99 | 37
Total other income (expense) | 99 | 37
Income (loss) from continuing operations before income tax expense | 35,497 | 36,080
Employee Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue | 56,109 | 52,778
Operating expenses | 45,735 | 42,622
Gross margin | 10,374 | 10,156
Corporate general & admin |  |
Operating income (loss) | 10,374 | 10,156
Other income (expense): |  |
Interest expense | (8) | (8)
Gain on sale of operations, net |  |
Other income, net | 286 | 101
Total other income (expense) | 278 | 93
Income (loss) from continuing operations before income tax expense | 10,652 | 10,249
National Practices [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue | 7,379 | 7,486
Operating expenses | 6,633 | 6,950
Gross margin | 746 | 536
Corporate general & admin |  |
Operating income (loss) | 746 | 536
Other income (expense): |  |
Interest expense |  |
Gain on sale of operations, net |  |
Other income, net |  |
Total other income (expense) |  |
Income (loss) from continuing operations before income tax expense | 746 | 536
Corporate and Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue |  |
Operating expenses | 3,797 | 4,935
Gross margin | (3,797) | (4,935)
Corporate general & admin | 10,259 | 9,984
Operating income (loss) | (14,056) | (14,919)
Other income (expense): |  |
Interest expense | (3,425) | (4,048)
Gain on sale of operations, net | 8 | 18
Other income, net | 1,590 | 1,590
Total other income (expense) | (1,827) | (2,440)
Income (loss) from continuing operations before income tax expense | $ (15,883) | $ (17,359)

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