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Calculation of Earnings per Share (Tables)
 6 Months Ended
Jun. 30, 2012
Earnings Per Share [Abstract]  
Calculation of Basic and Diluted Earnings per Share
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2012
 
2011
 
2012
 
2011
Net income attributable to VCA Antech, Inc
$
34,320

 
$
39,612

 
$
69,565

 
$
68,451

Weighted-average common shares outstanding:
 
 
 
 
 
 
 
Basic
87,589

 
86,535

 
87,443

 
86,445

Effect of dilutive potential common shares:
 
 
 
 
 
 
 
Stock options
550

 
647

 
555

 
664

Nonvested shares
584

 
122

 
557

 
194

Diluted
88,723

 
87,304

 
88,555

 
87,303

Basic earnings per share
$
0.39

 
$
0.46

 
$
0.80

 
$
0.79

Diluted earnings per share
$
0.39

 
$
0.45

 
$
0.79

 
$
0.78