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4. EARNINGS PER SHARE (Tables) | 6 Months Ended
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Jun. 30, 2013
Earnings Per Share [Abstract] |
EARNINGS PER SHARE |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Net income attributable to RadNet, Inc.'s common stockholders |  | $ | 2,686 |  |  | $ | 2,946 |  |  | $ | 1,344 |  |  | $ | 2,835 |
BASIC NET INCOME PER SHARE ATTRIBUTABLE TO RADNET, INC.'S COMMON STOCKHOLDERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding during the period |  |  | 39,217,122 |  |  |  | 37,761,316 |  |  |  | 39,038,904 |  |  |  | 37,715,723 |
Basic net income per share attributable to RadNet, Inc.'s common stockholders |  | $ | 0.07 |  |  | $ | 0.08 |  |  | $ | 0.03 |  |  | $ | 0.08 |
DILUTED NET INCOME PER SHARE ATTRIBUTABLE TO RADNET, INC.'S COMMON STOCKHOLDERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding during the period |  |  | 39,217,122 |  |  |  | 37,761,316 |  |  |  | 39,038,904 |  |  |  | 37,715,723 |
Add nonvested restricted stock subject only to service vesting |  |  | 302,799 |  |  |  | 521,667 |  |  |  | 302,438 |  |  |  | 494,744 |
Add additional shares issuable upon exercise of stock options and warrants |  |  | 309,742 |  |  |  | 1,147,733 |  |  |  | 511,956 |  |  |  | 1,005,165 |
Weighted average number of common shares used in calculating diluted net income per share |  |  | 39,829,663 |  |  |  | 39,430,716 |  |  |  | 39,853,298 |  |  |  | 39,215,632 |
Diluted net income per share attributable to RadNet, Inc.'s common stockholders |  | $ | 0.07 |  |  | $ | 0.07 |  |  | $ | 0.03 |  |  | $ | 0.07 |

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- Definition Tabular disclosure of the reconciliation of basic net earnings per share (or unit) to diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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