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Segment Disclosures - Summary of Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]                      
Revenue $ 195,142 $ 207,723 $ 211,016 $ 241,459 $ 178,785 $ 199,794 $ 197,015 $ 224,238 $ 855,340 $ 799,832 $ 750,422
Operating expenses 189,975 184,723 188,120 192,766 171,544 174,069 173,996 178,117 755,584 697,726 652,391 [1]
Gross margin 5,167 23,000 22,896 48,693 7,241 25,725 23,019 46,121 99,756 102,106 98,031
Corporate general and administrative expenses 7,316 7,979 9,232 8,768 9,049 8,679 8,346 10,245 33,295 36,319 32,527 [1]
Operating income (loss) (2,149) 15,021 13,664 39,925 (1,808) 17,046 14,673 35,876 66,461 65,787 65,504
Other income (expense):                      
Interest expense (1,689) (1,777) (1,692) (1,517) (1,574) (1,760) (1,733) (1,526) (6,675) (6,593) (8,902)
Gain on sale of operations, net     23 22 375 329 50 101 45 855 84
Other income, net 5,196 2,792 3,764 2,737 1,475 2,632 703 2,147 14,489 6,957 1,146 [1]
Total other income (expense), net 3,507 1,015 2,095 1,242 276 1,201 (980) 722 7,859 1,219 (7,672)
Income from continuing operations before income tax expense $ 1,358 $ 16,036 $ 15,759 $ 41,167 $ (1,532) $ 18,247 $ 13,693 $ 36,598 74,320 67,006 57,832
Operating Segments [Member] | Financial Services [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 540,315 501,307 476,396
Operating expenses                 468,089 432,254 411,325 [1]
Gross margin                 72,226 69,053 65,071
Operating income (loss)                 72,226 69,053 65,071
Other income (expense):                      
Other income, net                 158 209 (147) [1]
Total other income (expense), net                 158 209 (147)
Income from continuing operations before income tax expense                 72,384 69,262 64,924
Operating Segments [Member] | Benefits and Insurance Services [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 283,909 267,606 244,493
Operating expenses                 236,317 223,487 202,138 [1]
Gross margin                 47,592 44,119 42,355
Operating income (loss)                 47,592 44,119 42,355
Other income (expense):                      
Interest expense                 (36) (39) (35)
Other income, net                 442 367 467 [1]
Total other income (expense), net                 406 328 432
Income from continuing operations before income tax expense                 47,998 44,447 42,787
Operating Segments [Member] | National Practices [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 31,116 30,919 29,533
Operating expenses                 28,382 27,697 26,417 [1]
Gross margin                 2,734 3,222 3,116
Operating income (loss)                 2,734 3,222 3,116
Other income (expense):                      
Other income, net                 (8) 3 4 [1]
Total other income (expense), net                 (8) 3 4
Income from continuing operations before income tax expense                 2,726 3,225 3,120
Corporate and Other [Member]                      
Segment Reporting Information [Line Items]                      
Operating expenses                 22,796 14,288 12,511 [1]
Gross margin                 (22,796) (14,288) (12,511)
Corporate general and administrative expenses                 33,295 36,319 32,527 [1]
Operating income (loss)                 (56,091) (50,607) (45,038)
Other income (expense):                      
Interest expense                 (6,639) (6,554) (8,867)
Gain on sale of operations, net                 45 855 84
Other income, net                 13,897 6,378 822 [1]
Total other income (expense), net                 7,303 679 (7,961)
Income from continuing operations before income tax expense                 $ (48,788) $ (49,928) $ (52,999)
[1] “Operating expenses” under the Financial Services and Benefits and Insurance Services practice groups include a reduction of $0.9 million and $0.6 million related to a state payroll tax incentive associated with an office relocation. “Corporate general and administrative expenses” include a reduction of less than $0.1 million related to the office relocation as discussed above. The reductions was recorded in “Other (expense) income, net” in 2015 but was reclassified to “Operating expenses” and “Corporate general and administrative expenses” to align the incentives with the expenses associated with the office relocation. The reclassification had no impact on “Income from continuing operations” or diluted earnings per share from continuing operations.