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Financial Instruments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended
Dec. 16, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Mar. 31, 2011
Dec. 31, 2012
6 3/4 % Senior Notes Due 2020
Dec. 31, 2012
6.0% Senior Notes Due 2022
Nov. 27, 2012
6.0% Senior Notes Due 2022
Dec. 31, 2012
3 3/4% Senior Subordinated Convertible Notes Due 2012
Dec. 31, 2012
7 3/4 % Senior Notes Due 2016
Mar. 31, 2011
7 3/4 % Senior Notes Due 2016
Assets Sold under Agreements to Repurchase [Line Items]                      
Number of interest rate swap agreements         4            
Senior notes maturity year         2016            
Notional amount of interest rate swaps         $ 215.0            
Interest rate swap, fixed interest rate 7.10%                   7.75%
Interest rate swap, variable interest rate, minimum     5.43%                
Interest rate swap, variable interest rate, maximum     5.56%                
Decrease in interest expense due to converting the interest rate from fixed to variable     3.6                
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                    
Amortization of deferred gain   1.0                  
Loss on early extinguishment of debt                   (4.6)  
Interest percentage           6.75% 6.00% 6.00% 3.75%    
Debt maturity period           2020 2022 2022 2012    
Gain/Loss on remeasurement of contingent consideration   5.2 10.0                
Accretion expense   $ 2.2 $ 3.5 $ 1.2