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Quarterly Financial Data (Unaudited) - Summary of Unaudited Quarterly Results of Operations (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ 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
Quarterly Financial Information Disclosure [Abstract]                      
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
Income tax expense (benefit) (3,368) 6,172 4,343 16,141 (967) 7,260 5,306 14,800 23,288 26,399 22,829
Income (loss) from continuing operations 4,726 9,864 11,416 25,026 (565) 10,987 8,387 21,798 51,032 40,607 35,003
Loss from operations of discontinued operations, net of tax 121 (206) (418) (152) (121) (133) (258) (30) (655) (542) (2,323)
Net income (loss) $ 4,847 $ 9,658 $ 10,998 $ 24,874 $ (686) $ 10,854 $ 8,129 $ 21,768 $ 50,377 $ 40,065 34,107
Gain (loss) on disposal of discontinued operations, net of tax                     $ 1,427
Basic:                      
Continuing operations $ 0.09 $ 0.18 $ 0.21 $ 0.47 $ (0.01) $ 0.21 $ 0.16 $ 0.42 $ 0.95 $ 0.78 $ 0.70
Discontinued operations     (0.01)           (0.01) (0.01) (0.01)
Net income 0.09 0.18 0.20 0.47 (0.01) 0.21 0.16 0.42 0.94 0.77 0.69
Diluted:                      
Continuing operations 0.08 0.18 0.20 0.45 (0.01) 0.20 0.16 0.41 0.92 0.76 0.66
Discontinued operations     (0.01)           (0.01) (0.01) (0.01)
Net income $ 0.08 $ 0.18 $ 0.19 $ 0.45 $ (0.01) $ 0.20 $ 0.16 $ 0.41 $ 0.91 $ 0.75 $ 0.65
Basic weighted average common shares outstanding 54,034 54,142 53,968 53,293 53,019 52,648 52,031 51,572 53,862 52,321 50,280
Diluted weighted average common shares outstanding 55,822 55,827 55,831 55,214 53,019 53,846 53,079 52,745 55,689 53,513 52,693
[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.