Annual report pursuant to Section 13 and 15(d)

Commitments And Contingencies - Additional Information (Detail)

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Commitments And Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 3 Months Ended 12 Months Ended
May 16, 2012
State
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Rent expenses     $ 88.7 $ 85.0 $ 74.5
Reserved cost and potential exposure related to litigation and regulatory matters 45 45      
Legal and professional fees 5        
Number of states for Attorneys General 44        
Global settlement reflects current estimated range of loss     50    
Minimum percentage of interest-bearing open purchase arrangements     0.00%    
Maximum percentage of interest-bearing open purchase arrangements     1.00%    
Minimum financing days of interest- bearing open purchase arrangements     30 days    
Maximum financing days of interest- bearing open purchase arrangements     60 days    
Amounts outstanding under interest- bearing open purchase arrangements   71.8 87.7 71.8  
Interest expense under interest- bearing open purchase arrangements     3.8 3.2 2.1
Open purchase commitments     229.5    
Maximum [Member]
          
Attorneys' fees $ 5