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Segment Disclosures - Summary of Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Information [Line Items]        
Revenue $ 207,723 $ 199,794 $ 660,198 $ 621,047
Operating expenses 184,723 174,069 565,609 526,182
Gross margin 23,000 25,725 94,589 94,865
Corporate general & admin 7,979 8,679 25,979 27,270
Operating income 15,021 17,046 68,610 67,595
Other income (expense):        
Interest expense (1,777) (1,760) (4,986) (5,019)
Gain on sale of operations, net   329 45 480
Other income, net 2,792 2,632 9,293 5,482
Total other income, net 1,015 1,201 4,352 943
Income from continuing operations before income tax expense 16,036 18,247 72,962 68,538
Operating Segments [Member] | Financial Services [Member]        
Segment Reporting Information [Line Items]        
Revenue 130,305 123,049 421,529 398,112
Operating expenses 112,996 105,615 348,236 326,099
Gross margin 17,309 17,434 73,293 72,013
Operating income 17,309 17,434 73,293 72,013
Other income (expense):        
Other income, net 79 10 122 237
Total other income, net 79 10 122 237
Income from continuing operations before income tax expense 17,388 17,444 73,415 72,250
Operating Segments [Member] | Benefits and Insurance Services [Member]        
Segment Reporting Information [Line Items]        
Revenue 69,663 68,979 215,386 199,790
Operating expenses 59,155 57,627 179,174 167,651
Gross margin 10,508 11,352 36,212 32,139
Operating income 10,508 11,352 36,212 32,139
Other income (expense):        
Interest expense (10) (12) (30) (32)
Other income, net 82 62 298 220
Total other income, net 72 50 268 188
Income from continuing operations before income tax expense 10,580 11,402 36,480 32,327
Operating Segments [Member] | National Practices [Member]        
Segment Reporting Information [Line Items]        
Revenue 7,755 7,766 23,283 23,145
Operating expenses 7,109 6,895 21,351 20,777
Gross margin 646 871 1,932 2,368
Operating income 646 871 1,932 2,368
Other income (expense):        
Other income, net   1 (9) 2
Total other income, net   1 (9) 2
Income from continuing operations before income tax expense 646 872 1,923 2,370
Corporate and Other [Member]        
Segment Reporting Information [Line Items]        
Operating expenses 5,463 3,932 16,848 11,655
Gross margin (5,463) (3,932) (16,848) (11,655)
Corporate general & admin 7,979 8,679 25,979 27,270
Operating income (13,442) (12,611) (42,827) (38,925)
Other income (expense):        
Interest expense (1,767) (1,748) (4,956) (4,987)
Gain on sale of operations, net   329 45 480
Other income, net 2,631 2,559 8,882 5,023
Total other income, net 864 1,140 3,971 516
Income from continuing operations before income tax expense $ (12,578) $ (11,471) $ (38,856) $ (38,409)