Calculation of Earnings per Share (Tables)

3 Months Ended

Mar. 31, 2013

Earnings Per Share [Abstract]

Calculation of Basic and Diluted Earnings per Share

	Three Months Ended March 31,
	2013		2012
Net income attributable to VCA Antech, Inc	$	30,485	$	35,245
Weighted-average common shares outstanding:
Basic	88,400		86,984
Effect of dilutive potential common shares:
Stock options	284		560
Nonvested shares and units	695		511
Diluted	89,379		88,055
Basic earnings per share	$	0.34	$	0.41
Diluted earnings per share	$	0.34	$	0.40