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Segment Disclosures - Summary of Segment Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 149,836 | $ 168,779 | $ 172,229 | $ 201,189 | $ 135,965 | $ 149,312 | $ 153,936 | $ 187,325 | $ 692,033 | $ 626,538 | $ 591,270
Operating expenses | 147,992 | 150,258 | 151,091 | 159,389 | 133,977 | 136,773 | 135,564 | 149,172 | 608,730 | 555,486 | 518,528
Gross margin | 1,844 | 18,521 | 21,138 | 41,800 | 1,988 | 12,539 | 18,372 | 38,153 | 83,303 | 71,052 | 72,742
Corporate general & admin | 7,821 | 8,944 | 7,649 | 9,984 | 4,615 | 7,475 | 7,575 | 10,545 | 34,398 | 30,210 | 31,533
Operating income (loss) | (5,977) | 9,577 | 13,489 | 31,816 | (2,627) | 5,064 | 10,797 | 27,608 | 48,905 | 40,842 | 41,209
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest expense | (3,358) | (3,815) | (4,145) | (4,056) | (3,801) | (3,576) | (3,831) | (3,791) | (15,374) | (14,999) | (16,047)
Gain on sale of operations, net | 7 | 6 | 48 | 18 | 106 | 21 | 49 | 2,590 | 79 | 2,766 | 2,920
Other income, net | 3,203 | 2,371 | 515 | 1,728 | 3,191 | 2,542 | (884) | 3,365 | 7,817 | 8,214 | 3,201
Total other income (expense) | (148) | (1,438) | (3,582) | (2,310) | (504) | (1,013) | (4,666) | 2,164 | (7,478) | (4,019) | (9,926)
Income (loss) from continuing operations before income tax expense | (6,125) | 8,139 | 9,907 | 29,506 | (3,131) | 4,051 | 6,131 | 29,772 | 41,427 | 36,823 | 31,283
Financial Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 456,649 | 410,195 | 389,743
Operating expenses |  |  |  |  |  |  |  |  | 395,976 | 357,378 | 336,206
Gross margin |  |  |  |  |  |  |  |  | 60,673 | 52,817 | 53,537
Corporate general & admin |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | 60,673 | 52,817 | 53,537
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  | (2)
Gain on sale of operations, net |  |  |  |  |  |  |  |  |  |  |
Other income, net |  |  |  |  |  |  |  |  | 492 | 2,063 | 26
Total other income (expense) |  |  |  |  |  |  |  |  | 492 | 2,063 | 24
Income (loss) from continuing operations before income tax expense |  |  |  |  |  |  |  |  | 61,165 | 54,880 | 53,561
Employee Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 204,863 | 186,217 | 171,205
Operating expenses |  |  |  |  |  |  |  |  | 168,696 | 155,311 | 144,528
Gross margin |  |  |  |  |  |  |  |  | 36,167 | 30,906 | 26,677
Corporate general & admin |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | 36,167 | 30,906 | 26,677
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | (24) | (30) | (28)
Gain on sale of operations, net |  |  |  |  |  |  |  |  |  |  |
Other income, net |  |  |  |  |  |  |  |  | 297 | 1,086 | 780
Total other income (expense) |  |  |  |  |  |  |  |  | 273 | 1,056 | 752
Income (loss) from continuing operations before income tax expense |  |  |  |  |  |  |  |  | 36,440 | 31,962 | 27,429
National Practices [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 30,521 | 30,126 | 30,322
Operating expenses |  |  |  |  |  |  |  |  | 27,589 | 26,713 | 26,222
Gross margin |  |  |  |  |  |  |  |  | 2,932 | 3,413 | 4,100
Corporate general & admin |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | 2,932 | 3,413 | 4,100
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |
Gain on sale of operations, net |  |  |  |  |  |  |  |  |  |  |
Other income, net |  |  |  |  |  |  |  |  | 1 | 2 | 10
Total other income (expense) |  |  |  |  |  |  |  |  | 1 | 2 | 10
Income (loss) from continuing operations before income tax expense |  |  |  |  |  |  |  |  | 2,933 | 3,415 | 4,110
Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  | 16,469 | 16,084 | 11,572
Gross margin |  |  |  |  |  |  |  |  | (16,469) | (16,084) | (11,572)
Corporate general & admin |  |  |  |  |  |  |  |  | 34,398 | 30,210 | 31,533
Operating income (loss) |  |  |  |  |  |  |  |  | (50,867) | (46,294) | (43,105)
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | (15,350) | (14,969) | (16,017)
Gain on sale of operations, net |  |  |  |  |  |  |  |  | 79 | 2,766 | 2,920
Other income, net |  |  |  |  |  |  |  |  | 7,027 | 5,063 | 2,385
Total other income (expense) |  |  |  |  |  |  |  |  | (8,244) | (7,140) | (10,712)
Income (loss) from continuing operations before income tax expense |  |  |  |  |  |  |  |  | $ (59,111) | $ (53,434) | $ (53,817)

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