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Segment Disclosures - Summary of Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Segment Reporting Information [Line Items]        
Revenue $ 197,015 $ 185,042 $ 421,253 $ 398,908
Operating expenses 173,996 163,117 352,113 333,981
Gross margin 23,019 21,925 69,140 64,927
Corporate general & admin 8,346 6,615 18,591 16,480
Operating income 14,673 15,310 50,549 48,447
Other income (expense):        
Interest expense (1,733) (2,848) (3,259) (5,825)
Gain on sale of operations, net 50 45 151 101
Other (expense) income, net 703 (1,126) 2,850 1,733
Total other expense, net (980) (3,929) (258) (3,991)
Income from continuing operations before income tax expense 13,693 11,381 50,291 44,456
Operating Segments [Member] | Financial Services [Member]        
Segment Reporting Information [Line Items]        
Revenue 122,856 116,671 275,063 260,503
Operating expenses 106,987 102,345 220,484 210,963
Gross margin 15,869 14,326 54,579 49,540
Operating income 15,869 14,326 54,579 49,540
Other income (expense):        
Other (expense) income, net (27) 8 227 107
Total other expense, net (27) 8 227 107
Income from continuing operations before income tax expense 15,842 14,334 54,806 49,647
Operating Segments [Member] | Employee Services [Member]        
Segment Reporting Information [Line Items]        
Revenue 66,484 61,024 130,811 123,675
Operating expenses 56,344 51,242 110,024 102,770
Gross margin 10,140 9,782 20,787 20,905
Operating income 10,140 9,782 20,787 20,905
Other income (expense):        
Interest expense (10) (11) (20) (20)
Other (expense) income, net 84 82 158 199
Total other expense, net 74 71 138 179
Income from continuing operations before income tax expense 10,214 9,853 20,925 21,084
Operating Segments [Member] | National Practices [Member]        
Segment Reporting Information [Line Items]        
Revenue 7,675 7,347 15,379 14,730
Operating expenses 7,005 6,649 13,882 13,250
Gross margin 670 698 1,497 1,480
Operating income 670 698 1,497 1,480
Other income (expense):        
Other (expense) income, net 1 1 1 1
Total other expense, net 1 1 1 1
Income from continuing operations before income tax expense 671 699 1,498 1,481
Corporate and Other [Member]        
Segment Reporting Information [Line Items]        
Operating expenses 3,660 2,881 7,723 6,998
Gross margin (3,660) (2,881) (7,723) (6,998)
Corporate general & admin 8,346 6,615 18,591 16,480
Operating income (12,006) (9,496) (26,314) (23,478)
Other income (expense):        
Interest expense (1,723) (2,837) (3,239) (5,805)
Gain on sale of operations, net 50 45 151 101
Other (expense) income, net 645 (1,217) 2,464 1,426
Total other expense, net (1,028) (4,009) (624) (4,278)
Income from continuing operations before income tax expense $ (13,034) $ (13,505) $ (26,938) $ (27,756)