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Calculation of Earnings per Share (Tables)
 3 Months Ended
Mar. 31, 2016
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,
 
2016
 
2015
Net income attributable to VCA Inc.
$
46,227

 
$
38,301

Weighted-average common shares outstanding:
 
 
 
Basic
80,776

 
82,347

Effect of dilutive potential common shares:
 
 
 
Stock options
284

 
340

Non-vested shares and units
463

 
686

Diluted
81,523

 
83,373

Basic earnings per common share
$
0.57

 
$
0.47

Diluted earnings per common share
$
0.57

 
$
0.46