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Long-Term Debt and Redeemable Preferred Stock - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Senior Subordinated Term Loan Due 2014 [Member]
Dec. 31, 2011
Senior Subordinated Term Loan Due 2013
Sep. 30, 2012
2011 Term Loan Facility Due 2017 [Member]
Jun. 30, 2011
2011 Term Loan Facility Due 2017 [Member]
Sep. 30, 2012
2011 Revolving Credit Facility Due 2016 [Member]
Dec. 31, 2011
2011 Revolving Credit Facility Due 2016 [Member]
Jun. 30, 2011
2011 Revolving Credit Facility Due 2016 [Member]
Sep. 30, 2012
2011 Revolving Credit Facility [Member]
Sep. 30, 2012
Amended And Restated Senior Subordinated Term Loan Due 2014 [Member]
Apr. 30, 2012
Amended And Restated Senior Subordinated Term Loan Due 2014 [Member]
Debt Instrument And Redeemable Preferred Stock [Line Items]                    
Senior Subordinated Term Loan $ 58.4               $ 58.4  
Aggregate principal amount outstanding 107.0   790.0 800.0            
Contributed loan   48.6                
Discount rate over domestic treasuries                   0.75%
Prepayment Premium                   2.00%
Maximum borrowings available under credit facility         140.0   140.0      
Letters of credit outstanding         10.4          
Revolving Credit Facility                       
Availability under the credit facility         $ 126.4