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Segment Disclosures - Summary of Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 164,412 | $ 187,102 | $ 185,042 | $ 213,866 | $ 157,022 | $ 180,269 | $ 177,466 | $ 204,726 | $ 750,422 | $ 719,483 | $ 677,171
Operating expenses | 160,788 | 159,175 | 163,117 | 170,864 | 154,316 | 155,233 | 158,317 | 161,938 | 653,944 | 629,804 | 593,339
Gross margin | 3,624 | 27,927 | 21,925 | 43,002 | 2,706 | 25,036 | 19,149 | 42,788 | 96,478 | 89,679 | 83,832
Corporate general & admin | 8,071 | 8,043 | 6,615 | 9,865 | 6,790 | 8,889 | 8,306 | 10,198 | 32,594 | 34,183 | 34,398
Operating income (loss) | (4,447) | 19,884 | 15,310 | 33,137 | (4,084) | 16,147 | 10,843 | 32,590 | 63,884 | 55,496 | 49,434
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest expense | (1,237) | (1,840) | (2,848) | (2,977) | (2,991) | (3,123) | (3,577) | (3,433) | (8,902) | (13,124) | (15,374)
Gain on sale of operations, net | (22) | 5 | 45 | 56 | 1,210 | 17 | 68 | 8 | 84 | 1,303 | 79
Other income, net | 2,706 | (1,673) | (1,126) | 2,859 | 2,350 | (1,368) | 3,936 | 1,975 | 2,766 | 6,893 | 7,817
Total other income (expense) | 1,447 | (3,508) | (3,929) | (62) | 569 | (4,474) | 427 | (1,450) | (6,052) | (4,928) | (7,478)
Income (loss) from continuing operations before income tax expense | $ (3,000) | $ 16,376 | $ 11,381 | $ 33,075 | $ (3,515) | $ 11,673 | $ 11,270 | $ 31,140 | 57,832 | 50,568 | 41,956
Operating Segments [Member] | Financial Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 476,396 | 465,130 | 441,787
Operating expenses |  |  |  |  |  |  |  |  | 412,211 | 399,783 | 380,660
Gross margin |  |  |  |  |  |  |  |  | 64,185 | 65,347 | 61,127
Operating income (loss) |  |  |  |  |  |  |  |  | 64,185 | 65,347 | 61,127
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Other income, net |  |  |  |  |  |  |  |  | 739 | 417 | 491
Total other income (expense) |  |  |  |  |  |  |  |  | 739 | 417 | 491
Income (loss) from continuing operations before income tax expense |  |  |  |  |  |  |  |  | 64,924 | 65,764 | 61,618
Operating Segments [Member] | Employee Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 244,493 | 224,898 | 204,863
Operating expenses |  |  |  |  |  |  |  |  | 202,787 | 186,002 | 168,696
Gross margin |  |  |  |  |  |  |  |  | 41,706 | 38,896 | 36,167
Operating income (loss) |  |  |  |  |  |  |  |  | 41,706 | 38,896 | 36,167
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | (35) | (31) | (24)
Other income, net |  |  |  |  |  |  |  |  | 1,116 | 557 | 297
Total other income (expense) |  |  |  |  |  |  |  |  | 1,081 | 526 | 273
Income (loss) from continuing operations before income tax expense |  |  |  |  |  |  |  |  | 42,787 | 39,422 | 36,440
Operating Segments [Member] | National Practices [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 29,533 | 29,455 | 30,521
Operating expenses |  |  |  |  |  |  |  |  | 26,417 | 26,798 | 27,589
Gross margin |  |  |  |  |  |  |  |  | 3,116 | 2,657 | 2,932
Operating income (loss) |  |  |  |  |  |  |  |  | 3,116 | 2,657 | 2,932
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Other income, net |  |  |  |  |  |  |  |  | 4 | 4 | 1
Total other income (expense) |  |  |  |  |  |  |  |  | 4 | 4 | 1
Income (loss) from continuing operations before income tax expense |  |  |  |  |  |  |  |  | 3,120 | 2,661 | 2,933
Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  | 12,529 | 17,221 | 16,394
Gross margin |  |  |  |  |  |  |  |  | (12,529) | (17,221) | (16,394)
Corporate general & admin |  |  |  |  |  |  |  |  | 32,594 | 34,183 | 34,398
Operating income (loss) |  |  |  |  |  |  |  |  | (45,123) | (51,404) | (50,792)
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | (8,867) | (13,093) | (15,350)
Gain on sale of operations, net |  |  |  |  |  |  |  |  | 84 | 1,303 | 79
Other income, net |  |  |  |  |  |  |  |  | 907 | 5,915 | 7,028
Total other income (expense) |  |  |  |  |  |  |  |  | (7,876) | (5,875) | (8,243)
Income (loss) from continuing operations before income tax expense |  |  |  |  |  |  |  |  | $ (52,999) | $ (57,279) | $ (59,035)

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