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Quarterly Financial Data (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, 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
Selected Quarterly Financial Information [Abstract]                      
Revenues $ 557,133 $ 539,869 $ 547,274 $ 611,836 $ 532,438 $ 511,953 $ 519,256 $ 595,177 $ 2,256,112 $ 2,158,824 $ 1,976,219
Gross profit 89,978 97,409 97,746 108,118 93,503 98,420 87,294 [1] 103,004 393,251 382,221 351,775
Operating income 6,874 [2] 17,112 10,228 22,009 15,893 [3] 19,140 9,415 23,046 56,223 67,494 57,314
Net income $ 5,289 [4] $ 10,082 $ 3,488 [5] $ 13,173 $ 9,445 $ 11,452 $ 5,621 $ 13,884 $ 32,032 $ 40,402 $ 30,470
Basic net income per share (in dollars per share) $ 0.21 $ 0.39 $ 0.14 $ 0.51 $ 0.34 [6] $ 0.45 $ 0.22 $ 0.54 $ 1.25 $ 1.57 $ 1.16
Diluted net income per share (in dollars per share) $ 0.21 $ 0.39 $ 0.14 $ 0.51 $ 0.34 [6] $ 0.45 $ 0.22 $ 0.54 $ 1.25 $ 1.56 $ 1.16
[1] Included in the results for the second quarter of 2012 is a $2.9 million reduction to payroll tax expense related to a refund of Pennsylvania sales taxes. Please read Note 14, “Commitments and Contingencies,” for additional information.
[2] Included in the results for the fourth quarter of 2013 is a $3.3 million impairment charge, related to our Expense Management reporting unit. Please read Note 5, “Goodwill and Other Intangible Assets,” for additional information.
[3] Included in the results for the fourth quarter of 2012 is a $4.2 million impairment charge, related to our Performance Management reporting unit. Please read Note 5, “Goodwill and Other Intangible Assets,” for additional information.
[4] Includes a $2.0 million tax benefit related to tax years 2009 through 2012. Please read Note 9 to the Consolidated Financial Statements, “Income Taxes,” for additional information.
[5] Includes the impact of a $2.7 million non-cash impairment charge. Please read Note 6 to the Consolidated Financial Statements, “Other Assets,” for additional information.
[6] Under the two-class earnings per share method, undistributed losses resulting from dividends exceeding net income are not allocated to participating securities. This resulted in a $0.03 earnings per share decrease in the fourth quarter of 2012. Please read Note 12, “Net Income Per Share,” for additional information.