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Segment Disclosures - Summary of Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting Information [Line Items]        
Revenue $ 211,016 $ 197,015 $ 452,475 $ 421,253
Operating expenses 188,120 173,996 380,886 352,113
Gross margin 22,896 23,019 71,589 69,140
Corporate general & admin 9,232 8,346 18,000 18,591
Operating income 13,664 14,673 53,589 50,549
Other income (expense):        
Interest expense (1,692) (1,733) (3,209) (3,259)
Gain on sale of operations, net 23 50 45 151
Other income, net 3,764 703 6,501 2,850
Total other income (expense), net 2,095 (980) 3,337 (258)
Income from continuing operations before income tax expense 15,759 13,693 56,926 50,291
Operating Segments [Member] | Financial Services [Member]        
Segment Reporting Information [Line Items]        
Revenue 132,591 122,856 291,224 275,063
Operating expenses 115,851 106,987 235,240 220,484
Gross margin 16,740 15,869 55,984 54,579
Operating income 16,740 15,869 55,984 54,579
Other income (expense):        
Other income, net 28 (27) 43 227
Total other income (expense), net 28 (27) 43 227
Income from continuing operations before income tax expense 16,768 15,842 56,027 54,806
Operating Segments [Member] | Benefits and Insurance Services [Member]        
Segment Reporting Information [Line Items]        
Revenue 70,559 66,484 145,723 130,811
Operating expenses 59,877 56,344 120,019 110,024
Gross margin 10,682 10,140 25,704 20,787
Operating income 10,682 10,140 25,704 20,787
Other income (expense):        
Interest expense (9) (10) (20) (20)
Other income, net 120 84 216 158
Total other income (expense), net 111 74 196 138
Income from continuing operations before income tax expense 10,793 10,214 25,900 20,925
Operating Segments [Member] | National Practices [Member]        
Segment Reporting Information [Line Items]        
Revenue 7,866 7,675 15,528 15,379
Operating expenses 7,235 7,005 14,242 13,882
Gross margin 631 670 1,286 1,497
Operating income 631 670 1,286 1,497
Other income (expense):        
Other income, net (9) 1 (9) 1
Total other income (expense), net (9) 1 (9) 1
Income from continuing operations before income tax expense 622 671 1,277 1,498
Corporate and Other [Member]        
Segment Reporting Information [Line Items]        
Operating expenses 5,157 3,660 11,385 7,723
Gross margin (5,157) (3,660) (11,385) (7,723)
Corporate general & admin 9,232 8,346 18,000 18,591
Operating income (14,389) (12,006) (29,385) (26,314)
Other income (expense):        
Interest expense (1,683) (1,723) (3,189) (3,239)
Gain on sale of operations, net 23 50 45 151
Other income, net 3,625 645 6,251 2,464
Total other income (expense), net 1,965 (1,028) 3,107 (624)
Income from continuing operations before income tax expense $ (12,424) $ (13,034) $ (26,278) $ (26,938)