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Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2011
Quarterly Financial Data [Abstract] |
Schedule Of Quarterly Financial Information |
|  | Quarter |
2011 |  | 1 |  |  | 2 |  |  | 3 |  |  | 4 |
Net service revenues |  | $ | 880,869 |  |  | $ | 937,966 |  |  | $ | 984,668 |  |  | $ | 973,473 |
Gross margin |  | $ | 338,089 |  |  | $ | 372,288 |  |  | $ | 391,903 |  |  | $ | 387,322 |
Income before income taxes |  | $ | 44,576 |  |  | $ | 61,284 |  |  | $ | 72,195 |  |  | $ | 72,161 |
Net income |  | $ | 26,705 |  |  | $ | 36,425 |  |  | $ | 44,168 |  |  | $ | 42,624 |
Net income available to common stockholders - diluted |  | $ | 26,293 |  |  | $ | 35,890 |  |  | $ | 43,556 |  |  | $ | 42,037 |
Basic net income per share |  | $ | .18 |  |  | $ | .25 |  |  | $ | .31 |  |  | $ | .30 |
Diluted net income per share |  | $ | .18 |  |  | $ | .25 |  |  | $ | .31 |  |  | $ | .30 |
|  | Quarter |
2010 |  | 1 |  |  | 2 |  |  | 3 |  |  | 4 |
Net service revenues |  | $ | 737,173 |  |  | $ | 769,090 |  |  | $ | 817,258 |  |  | $ | 851,572 |
Gross margin |  | $ | 268,128 |  |  | $ | 289,858 |  |  | $ | 309,140 |  |  | $ | 326,907 |
Income before income taxes |  | $ | 12,265 |  |  | $ | 22,387 |  |  | $ | 37,268 |  |  | $ | 43,248 |
Net income |  | $ | 8,475 |  |  | $ | 12,181 |  |  | $ | 20,623 |  |  | $ | 24,790 |
Net income available to common stockholders - diluted |  | $ | 7,626 |  |  | $ | 11,660 |  |  | $ | 20,099 |  |  | $ | 24,144 |
Basic net income per share |  | $ | .05 |  |  | $ | .08 |  |  | $ | .14 |  |  | $ | .17 |
Diluted net income per share |  | $ | .05 |  |  | $ | .08 |  |  | $ | .14 |  |  | $ | .17 |

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 270 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (a)-(j) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6952194&loc=d3e1280-108306 + Details
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