Condensed, Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income related to redeemable and mandatorily redeemable noncontrolling interests	$ 2.5	$ 1.9

Comprehensive income attributable to redeemable noncontrolling interests.

No definition available.

Name:	woof_ComprehensiveIncomeAttributableToRedeemableNoncontrollingInterests
Namespace Prefix:	woof_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration