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Segment Disclosures - Summary of Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]                      
Revenue $ 203,138 $ 239,790 $ 235,498 $ 269,998 $ 199,023 $ 224,249 $ 232,641 $ 266,090 $ 948,424 $ 922,003 $ 855,340
Operating expenses 200,706 209,146 198,148 215,496 181,824 198,607 205,102 204,750 823,496 790,283 755,584
Gross margin 2,432 30,644 37,350 54,502 17,199 25,642 27,539 61,340 124,928 131,720 99,756
Corporate general and administrative expenses 10,490 11,670 10,566 11,680 8,873 10,279 9,993 10,028 44,406 39,173 33,295
Operating income (8,058) 18,974 26,784 42,822 8,326 15,363 17,546 51,312 80,522 92,547 66,461
Other (expense) income:                      
Interest expense (1,256) (1,521) (1,587) (1,401) (1,434) (1,614) (1,817) (1,780) (5,765) (6,645) (6,675)
Gain on sale of operations, net 15 (145) 50 497 362     663 417 1,025 45
Other (expense) income, net 4,999 6,767 (3,311) 9,260 (9,631) 3,143 630 (1,229) 17,715 (7,087) 14,489
Total other income (expense), net 3,758 5,101 (4,848) 8,356 (10,703) 1,529 (1,187) (2,346) 12,367 (12,707) 7,859
Income from continuing operations before income tax expense $ (4,300) $ 24,075 $ 21,936 $ 51,178 $ (2,377) $ 16,892 $ 16,359 $ 48,966 92,889 79,840 74,320
Financial Services [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 616,567 600,926  
Benefits and Insurance Services [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 296,228 288,437  
National Practices [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 35,629 32,640  
Operating Segments [Member] | Financial Services [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 616,567 600,926 540,315
Operating expenses                 515,240 508,653 468,089
Gross margin                 101,327 92,273 72,226
Operating income                 101,327 92,273 72,226
Other (expense) income:                      
Gain on sale of operations, net                 578    
Other (expense) income, net                 (121) (263) 158
Total other income (expense), net                 457 (263) 158
Income from continuing operations before income tax expense                 101,784 92,010 72,384
Operating Segments [Member] | Benefits and Insurance Services [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 296,228 288,437 283,909
Operating expenses                 246,245 239,646 236,317
Gross margin                 49,983 48,791 47,592
Operating income                 49,983 48,791 47,592
Other (expense) income:                      
Interest expense                 (57) (102) (36)
Other (expense) income, net                 238 493 442
Total other income (expense), net                 181 391 406
Income from continuing operations before income tax expense                 50,164 49,182 47,998
Operating Segments [Member] | National Practices [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 35,629 32,640 31,116
Operating expenses                 32,474 30,003 28,382
Gross margin                 3,155 2,637 2,734
Operating income                 3,155 2,637 2,734
Other (expense) income:                      
Other (expense) income, net                 1 3 (8)
Total other income (expense), net                 1 3 (8)
Income from continuing operations before income tax expense                 3,156 2,640 2,726
Corporate and Other [Member]                      
Segment Reporting Information [Line Items]                      
Operating expenses                 29,537 11,981 22,796
Gross margin                 (29,537) (11,981) (22,796)
Corporate general and administrative expenses                 44,406 39,173 33,295
Operating income                 (73,943) (51,154) (56,091)
Other (expense) income:                      
Interest expense                 (5,708) (6,543) (6,639)
Gain on sale of operations, net                 (161) 1,025 45
Other (expense) income, net                 17,597 (7,320) 13,897
Total other income (expense), net                 11,728 (12,838) 7,303
Income from continuing operations before income tax expense                 $ (62,215) $ (63,992) $ (48,788)