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Calculation of Earnings per Share (Tables)
 6 Months Ended
Jun. 30, 2013
Earnings Per Share [Abstract]  
Calculation of Basic and Diluted Earnings per Share
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2013
 
2012
 
2013
 
2012
Net income attributable to VCA Antech, Inc
$
41,662

 
$
34,320

 
$
72,147

 
$
69,565

Weighted-average common shares outstanding:
 
 
 
 
 
 
 
Basic
88,509

 
87,589

 
88,455

 
87,443

Effect of dilutive potential common shares:
 
 
 
 
 
 
 
Stock options
321

 
550

 
298

 
555

Nonvested shares and units
823

 
584

 
778

 
557

Diluted
89,653

 
88,723

 
89,531

 
88,555

Basic earnings per share
$
0.47

 
$
0.39

 
$
0.82

 
$
0.80

Diluted earnings per share
$
0.46

 
$
0.39

 
$
0.81

 
$
0.79