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Calculation of Earnings per Share (Tables)
 3 Months Ended
Mar. 31, 2014
Earnings Per Share [Abstract]  
Calculation of Basic and Diluted Earnings per Share
Basic and diluted earnings per share were calculated as follows (in thousands, except per share amounts): 
 
Three Months Ended
March 31,
 
2014
 
2013
Net income attributable to VCA Antech, Inc.
$
34,043

 
$
30,485

Weighted-average common shares outstanding:
 
 
 
Basic
88,338

 
88,400

Effect of dilutive potential common shares:
 
 
 
Stock options
254

 
284

Nonvested shares and units
829

 
695

Diluted
89,421

 
89,379

Basic earnings per share
$
0.39

 
$
0.34

Diluted earnings per share
$
0.38

 
$
0.34