Foreign Currency Sale Contracts (Detail) In Millions, unless otherwise specified	9 Months Ended				9 Months Ended
	Sep. 07, 2012 European Joint Venture USD ($)	Sep. 09, 2011 European Joint Venture USD ($)	Sep. 07, 2012 European Joint Venture EUR (€)	Dec. 31, 2011 European Joint Venture USD ($)	Sep. 07, 2012 Hhr New Zealand Holdings Limited USD ($)	Sep. 09, 2011 Hhr New Zealand Holdings Limited USD ($)	Sep. 07, 2012 Hhr New Zealand Holdings Limited NZD	Dec. 31, 2011 Hhr New Zealand Holdings Limited USD ($)
Derivative [Line Items]
Transaction Date Range	February 2008-July 2011				July 2011
Transaction Amount	$ 140		€ 100		$ 25		30
Forward Purchase Date Range	October 2012- August 2015				August 2013
Fair Value	11.2			8.8	0.7			1.9
Change in Fair Value	$ 2.4	$ (2.9)			$ (1.2)	$ 1.2