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Financial Instruments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
1 Months Ended 6 Months Ended
Dec. 16, 2011
Jun. 30, 2012
Dec. 31, 2011
Mar. 31, 2011
Assets Sold under Agreements to Repurchase [Line Items]        
Number of interest rate swap agreements       4
Interest rate swap, fixed interest rate 7.10%      
Notional amount of interest rate swaps       $ 215.0
Interest rate swap, variable interest rate, minimum     5.43%  
Interest rate swap, variable interest rate, maximum     5.56%  
Senior notes maturity year       2016
Cash proceeds from interest rate swap termination 6.6      
Accrued interest from termination of interest rate swaps 1.0      
Interest rate swap agreements, proceeds on termination 5.6 5.1    
Amortization of net proceeds   0.5    
Fair value of long-term debt   825 882  
Carrying value of long-term debt   815.0 815.0  
Equity component included in carrying value of long-term debt   $ 18.0    
7 3/4 % Senior Notes Due 2016
       
Assets Sold under Agreements to Repurchase [Line Items]        
Interest rate swap, fixed interest rate       7.75%
6 3/4 % Senior Notes Due 2020
       
Assets Sold under Agreements to Repurchase [Line Items]        
Interest rate swap, fixed interest rate   6.75%    
Senior notes maturity year   2020