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EARNINGS (LOSS) PER SHARE (Tables)
 3 Months Ended
Mar. 31, 2012
Earnings Per Share, Basic and Diluted [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The computation of basic and diluted earnings (loss) per common share was as follows (in thousands, except per share data):
 
Three Months Ended March 31,
 
2012
 
2011
Amounts attributable to Quest Diagnostics’ stockholders:
 

 
 

Income (loss) from continuing operations
$
158,844

 
$
(53,487
)
Income (loss) from discontinued operations, net of taxes
274

 
(374
)
Net income (loss) attributable to Quest Diagnostics’ common stockholders
$
159,118

 
$
(53,861
)
 
 
 
 
Income (loss) from continuing operations
$
158,844

 
$
(53,487
)
Less: Earnings allocated to participating securities
604

 
90

Earnings (loss) available to Quest Diagnostics’ common stockholders – basic and diluted
$
158,240

 
$
(53,577
)
 
 
 
 
Weighted average common shares outstanding – basic
158,293

 
161,489

Effect of dilutive securities:
 

 
 

Stock options and performance share units
1,413

 
—

Weighted average common shares outstanding – diluted
159,706

 
161,489

 
 
 
 
Earnings (loss) per share attributable to Quest Diagnostics’ common stockholders – basic:
 

 
 

Income (loss) from continuing operations
$
1.00

 
$
(0.33
)
Income (loss) from discontinued operations
—

 
—

Net income (loss)
$
1.00

 
$
(0.33
)
 
 
 
 
Earnings (loss) per share attributable to Quest Diagnostics’ common stockholders – diluted:
 

 
 

Income (loss) from continuing operations
$
0.99

 
$
(0.33
)
Income (loss) from discontinued operations
—

 
—

Net income (loss)
$
0.99

 
$
(0.33
)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
The following securities were not included in the calculation of diluted earnings per share due to their antidilutive effect (shares in thousands):
 
Three Months Ended March 31,
 
2012
 
2011
Stock options and performance share units
1,995

 
3,746