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Segment Disclosures - Summary of Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting Information [Line Items]        
Revenue $ 239,790 $ 224,249 $ 745,286 $ 722,980
Operating expenses 209,146 198,607 622,790 608,459
Gross margin 30,644 25,642 122,496 114,521
Corporate general & admin 11,670 10,279 33,916 30,300
Operating income 18,974 15,363 88,580 84,221
Other income (expense):        
Interest expense (1,521) (1,614) (4,509) (5,211)
Gain (loss) on sale of operations, net (145)   402 663
Other income (expense), net 6,767 3,143 12,716 2,544
Total other income (expense), net 5,101 1,529 8,609 (2,004)
Income from continuing operations before income tax expense 24,075 16,892 97,189 82,217
Financial Services [Member]        
Segment Reporting Information [Line Items]        
Revenue 153,794 146,145 493,311 478,485
Benefits and Insurance Services [Member]        
Segment Reporting Information [Line Items]        
Revenue 76,960 70,069 225,342 220,152
National Practices [Member]        
Segment Reporting Information [Line Items]        
Revenue 9,036 8,035 26,633 24,343
Operating Segments [Member] | Financial Services [Member]        
Segment Reporting Information [Line Items]        
Revenue 153,794 146,145 493,311 478,485
Operating expenses 128,231 124,546 390,847 386,649
Gross margin 25,563 21,599 102,464 91,836
Operating income 25,563 21,599 102,464 91,836
Other income (expense):        
Gain (loss) on sale of operations, net 16   563  
Other income (expense), net 14 (142) (188) 106
Total other income (expense), net 30 (142) 375 106
Income from continuing operations before income tax expense 25,593 21,457 102,839 91,942
Operating Segments [Member] | Benefits and Insurance Services [Member]        
Segment Reporting Information [Line Items]        
Revenue 76,960 70,069 225,342 220,152
Operating expenses 63,390 59,399 185,836 181,697
Gross margin 13,570 10,670 39,506 38,455
Operating income 13,570 10,670 39,506 38,455
Other income (expense):        
Interest expense (14) (7) (38) (96)
Other income (expense), net 9 129 204 351
Total other income (expense), net (5) 122 166 255
Income from continuing operations before income tax expense 13,565 10,792 39,672 38,710
Operating Segments [Member] | National Practices [Member]        
Segment Reporting Information [Line Items]        
Revenue 9,036 8,035 26,633 24,343
Operating expenses 8,104 7,514 24,308 22,356
Gross margin 932 521 2,325 1,987
Operating income 932 521 2,325 1,987
Other income (expense):        
Other income (expense), net     1  
Total other income (expense), net     1  
Income from continuing operations before income tax expense 932 521 2,326 1,987
Corporate and Other [Member]        
Segment Reporting Information [Line Items]        
Operating expenses 9,421 7,148 21,799 17,757
Gross margin (9,421) (7,148) (21,799) (17,757)
Corporate general & admin 11,670 10,279 33,916 30,300
Operating income (21,091) (17,427) (55,715) (48,057)
Other income (expense):        
Interest expense (1,507) (1,607) (4,471) (5,115)
Gain (loss) on sale of operations, net (161)   (161) 663
Other income (expense), net 6,744 3,156 12,699 2,087
Total other income (expense), net 5,076 1,549 8,067 (2,365)
Income from continuing operations before income tax expense $ (16,015) $ (15,878) $ (47,648) $ (50,422)