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Segment Disclosures - Summary of Segment Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]                      
Revenue $ 149,836 $ 168,779 $ 172,229 $ 201,189 $ 135,965 $ 149,312 $ 153,936 $ 187,325 $ 692,033 $ 626,538 $ 591,270
Operating expenses 147,992 150,258 151,091 159,389 133,977 136,773 135,564 149,172 608,730 555,486 518,528
Gross margin 1,844 18,521 21,138 41,800 1,988 12,539 18,372 38,153 83,303 71,052 72,742
Corporate general & admin 7,821 8,944 7,649 9,984 4,615 7,475 7,575 10,545 34,398 30,210 31,533
Operating income (loss) (5,977) 9,577 13,489 31,816 (2,627) 5,064 10,797 27,608 48,905 40,842 41,209
Other income (expense):                      
Interest expense (3,358) (3,815) (4,145) (4,056) (3,801) (3,576) (3,831) (3,791) (15,374) (14,999) (16,047)
Gain on sale of operations, net 7 6 48 18 106 21 49 2,590 79 2,766 2,920
Other income, net 3,203 2,371 515 1,728 3,191 2,542 (884) 3,365 7,817 8,214 3,201
Total other income (expense) (148) (1,438) (3,582) (2,310) (504) (1,013) (4,666) 2,164 (7,478) (4,019) (9,926)
Income (loss) from continuing operations before income tax expense (6,125) 8,139 9,907 29,506 (3,131) 4,051 6,131 29,772 41,427 36,823 31,283
Financial Services [Member]
                      
Segment Reporting Information [Line Items]                      
Revenue                 456,649 410,195 389,743
Operating expenses                 395,976 357,378 336,206
Gross margin                 60,673 52,817 53,537
Corporate general & admin                         
Operating income (loss)                 60,673 52,817 53,537
Other income (expense):                      
Interest expense                       (2)
Gain on sale of operations, net                         
Other income, net                 492 2,063 26
Total other income (expense)                 492 2,063 24
Income (loss) from continuing operations before income tax expense                 61,165 54,880 53,561
Employee Services [Member]
                      
Segment Reporting Information [Line Items]                      
Revenue                 204,863 186,217 171,205
Operating expenses                 168,696 155,311 144,528
Gross margin                 36,167 30,906 26,677
Corporate general & admin                         
Operating income (loss)                 36,167 30,906 26,677
Other income (expense):                      
Interest expense                 (24) (30) (28)
Gain on sale of operations, net                         
Other income, net                 297 1,086 780
Total other income (expense)                 273 1,056 752
Income (loss) from continuing operations before income tax expense                 36,440 31,962 27,429
National Practices [Member]
                      
Segment Reporting Information [Line Items]                      
Revenue                 30,521 30,126 30,322
Operating expenses                 27,589 26,713 26,222
Gross margin                 2,932 3,413 4,100
Corporate general & admin                         
Operating income (loss)                 2,932 3,413 4,100
Other income (expense):                      
Interest expense                         
Gain on sale of operations, net                         
Other income, net                 1 2 10
Total other income (expense)                 1 2 10
Income (loss) from continuing operations before income tax expense                 2,933 3,415 4,110
Corporate and Other [Member]
                      
Segment Reporting Information [Line Items]                      
Revenue                         
Operating expenses                 16,469 16,084 11,572
Gross margin                 (16,469) (16,084) (11,572)
Corporate general & admin                 34,398 30,210 31,533
Operating income (loss)                 (50,867) (46,294) (43,105)
Other income (expense):                      
Interest expense                 (15,350) (14,969) (16,017)
Gain on sale of operations, net                 79 2,766 2,920
Other income, net                 7,027 5,063 2,385
Total other income (expense)                 (8,244) (7,140) (10,712)
Income (loss) from continuing operations before income tax expense                 $ (59,111) $ (53,434) $ (53,817)