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Segment Disclosures - Summary of Segment Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Segment Reporting Information [Line Items]        
Revenue $ 183,799 $ 168,779 $ 573,592 $ 542,197
Operating expenses 159,026 150,258 487,520 460,738
Gross margin 24,773 18,521 86,072 81,459
Corporate general & admin 8,889 8,944 27,454 26,577
Operating income (loss) 15,884 9,577 58,618 54,882
Other income (expense):        
Interest expense (3,123) (3,815) (10,133) (12,016)
Gain on sale of operations, net 17 6 93 72
Other income (expense), net (1,368) 2,371 4,543 4,614
Total other income (expense) (4,474) (1,438) (5,497) (7,330)
Income (loss) from continuing operations before income tax expense 11,410 8,139 53,121 47,552
Financial Services [Member]
        
Segment Reporting Information [Line Items]        
Revenue 119,462 110,552 383,964 365,004
Operating expenses 102,789 96,999 317,402 300,602
Gross margin 16,673 13,553 66,562 64,402
Operating income (loss) 16,673 13,553 66,562 64,402
Other income (expense):        
Other income (expense), net 193 74 234 450
Total other income (expense) 193 74 234 450
Income (loss) from continuing operations before income tax expense 16,866 13,627 66,796 64,852
Employee Services [Member]
        
Segment Reporting Information [Line Items]        
Revenue 56,891 50,415 167,479 154,681
Operating expenses 47,194 42,055 138,865 127,545
Gross margin 9,697 8,360 28,614 27,136
Operating income (loss) 9,697 8,360 28,614 27,136
Other income (expense):        
Interest expense (7) (7) (23) (15)
Other income (expense), net 97 63 472 238
Total other income (expense) 90 56 449 223
Income (loss) from continuing operations before income tax expense 9,787 8,416 29,063 27,359
National Practices [Member]
        
Segment Reporting Information [Line Items]        
Revenue 7,446 7,812 22,149 22,512
Operating expenses 6,583 6,617 19,901 20,442
Gross margin 863 1,195 2,248 2,070
Operating income (loss) 863 1,195 2,248 2,070
Other income (expense):        
Other income (expense), net 4 1 4 1
Total other income (expense) 4 1 4 1
Income (loss) from continuing operations before income tax expense 867 1,196 2,252 2,071
Corporate and Other [Member]
        
Segment Reporting Information [Line Items]        
Operating expenses 2,460 4,587 11,352 12,149
Gross margin (2,460) (4,587) (11,352) (12,149)
Corporate general & admin 8,889 8,944 27,454 26,577
Operating income (loss) (11,349) (13,531) (38,806) (38,726)
Other income (expense):        
Interest expense (3,116) (3,808) (10,110) (12,001)
Gain on sale of operations, net 17 6 93 72
Other income (expense), net (1,662) 2,233 3,833 3,925
Total other income (expense) (4,761) (1,569) (6,184) (8,004)
Income (loss) from continuing operations before income tax expense $ (16,110) $ (15,100) $ (44,990) $ (46,730)