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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2013
Earnings Per Share [Abstract] |
Computation of basic and diluted earnings per share from continuing operations | The following table sets forth the computation of basic and diluted earnings per share for continuing operations for the three months ended March 31, 2013 and 2012 (in thousands, except per share data).
|  | Three Months Ended March 31, |
|  | 2013 |  |  | 2012 |
Numerator: |  |  |  |  |  |  |  |
Income from continuing operations after income tax expense |  | $ | 18,283 |  |  | $ | 18,767 |
Denominator: |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  | 49,417 |  |  |  | 49,103 |
Diluted |  |  |  |  |  |  |  |
Stock options (1) |  |  | 25 |  |  |  | — |
Restricted stock awards (1) |  |  | 342 |  |  |  | 310 |
Contingent shares (2) |  |  | 52 |  |  |  | 118 |
Diluted weighted average common shares outstanding |  |  | 49,836 |  |  |  | 49,531 |
Basic earnings per share from continuing operations |  | $ | 0.37 |  |  | $ | 0.38 |
Diluted earnings per share from continuing operations |  | $ | 0.37 |  |  | $ | 0.38 |
| (1) | A total of 7.4 million stock-based awards were excluded from the calculation of diluted earnings per share for the three months ended March 31, 2013 and 2012, as their effect would be anti-dilutive.
| (2) | Contingent shares represent additional shares to be issued for purchase price earned by former owners of businesses acquired by CBIZ once future conditions have been met.

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- Definition Tabular disclosure of the numerators and the denominators of the basic and diluted per-share (or per-unit) computations for income from continuing operations, including the effect that has been given to preferred dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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