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Borrowings - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Convertible Notes Three Point Eight Seven Five Percent
Dec. 31, 2012
Securitization Program
Jun. 13, 2011
6.875% Senior Subordinated Notes Due 2019
Jul. 01, 2012
6.875% Senior Subordinated Notes Due 2019
Dec. 31, 2012
6.875% Senior Subordinated Notes Due 2019
Jun. 13, 2012
6.875% Senior Subordinated Notes Due 2019
Dec. 31, 2011
6.875% Senior Subordinated Notes Due 2019
Dec. 31, 2011
2004 Senior Notes
Mar. 31, 2011
Incremental Facility
Dec. 31, 2012
Incremental Facility
Mar. 31, 2011
Senior Credit Facility, Term Loan Facility, At An Average Rate Of 1.31%, Due 10/1/2012
Mar. 31, 2011
Extension Of Senior Credit Facility
Dec. 31, 2012
Extension Of Senior Credit Facility
Mar. 31, 2011
Extension Of Senior Credit Facility
Minimum
Mar. 31, 2011
Extension Of Senior Credit Facility
Maximum
Dec. 31, 2012
Term Loan
Dec. 31, 2012
Federal Funds Rate
Dec. 31, 2012
Federal Funds Rate
Minimum
Dec. 31, 2012
Federal Funds Rate
Maximum
Dec. 31, 2012
Prime Rate
Dec. 31, 2012
LIBOR
Dec. 31, 2012
LIBOR
Minimum
Dec. 31, 2012
LIBOR
Maximum
Dec. 31, 2012
Libor
Maximum
Dec. 31, 2011
Revolving Credit Facility
Dec. 31, 2012
Revolving Credit Facility
Dec. 31, 2012
Revolving Credit Facility
Standby Letters of Credit
Dec. 31, 2012
3.875% Convertible Senior Subordinated Notes Due 2017
D
Dec. 31, 2011
3.875% Convertible Senior Subordinated Notes Due 2017
Dec. 31, 2012
Term loan facility, at a rate of 2.75%, due 10/1/2014
Dec. 31, 2011
Term loan facility, at a rate of 2.75%, due 10/1/2014
Debt Instrument [Line Items]                                                                    
Line of credit facility                         $ 375,000,000                                 $ 2,400,000     $ 375,000,000 $ 375,000,000
Repayment of borrowings under senior credit facilities                       80,000,000             125,000,000                              
Additional borrowings on convertible notes                       100,000,000                                            
Conversion of term loans maturing in 2012 to term loans with new maturity                           36,100,000                                        
Revolving credit facility converted amount with new termination date                             33,700,000                                      
Debt instrument maturity date               2019 2019           2014-10-01                               2017 2017    
Transaction fees           3,700,000                   300,000                                    
Basis spread               0.50%                       0.50%     1.00% 0.25% 2.50%                  
Additional margin over libor plus basis spread                                         0.50% 1.75%     1.50% 2.75%                
Interest rate               6.875% 6.875%                                   2.75%       3.875% 3.875%    
Borrowing under revolving credit                                                       165,000,000            
Maximum amount available for borrowing         44,000,000                                             400,000,000            
Amount available in committed financing under the revolving credit facility                                                         397,600,000          
Commitment fee percent 0.50%                               0.375% 0.50%                                
Principal amount of convertible notes 400,000,000 400,000,000                                                                
Number of trading days                                                             20 days      
Number of consecutive trading days                                                             30 days      
Percentage of conversion price of applicable trading day                                                             130.00%      
Number of business days                                                             5      
Principal amount of Convertible Notes                                                             1,000      
Percentage of the product of the last reported sale price of the common stock                                                             98.00%      
Convertible Notes conversion rate                                                             16.3084      
Conversion price, per share                                                             $ 61.32      
Convertible note hedge transactions, purchased call options 88,000,000                                                                  
Convertible note hedge transactions, net of tax 56,000,000                                                                  
Convertible notes, latest date of termination Jul. 28, 2017                                                                  
Percentage of shares of common stock issued under the terms of the warrant transactions     19.99%                                                              
Conversion of convertible notes, shares issued upon conversion     7,981,422                                                              
Strike price of warrants     $ 74.65                                                              
Warrants expiration period     180 days                                                              
Warrants expiration date     Nov. 01, 2017                                                              
Proceeds from sale of warrants     59,400,000                                                              
Convertible debt, fair value 316,300,000                                                                  
Initial equity component 83,700,000                                                                  
Convertible notes, carrying value, net of tax 53,300,000                                                                  
Debt discount 83,700,000                                                                  
Remaining life of the convertible notes 4 years 7 months 6 days                                                                  
Effective interest rate 7.814%                                                                  
6.875% Senior Subordinated Notes due 2019               250,000,000 250,000,000 250,000,000                                                
Repayment of Debt           125,000,000                                                        
Write-off of debt issuance costs             800,000       700,000                                              
Percent of redemption price to principal amount any time on or after June 1, 2015               103.438%                                                    
Debt instrument, earliest date of redemption               Jun. 01, 2015                                                    
Declining percent of redemption price to principal amount on June1, 2017               100.00%                                                    
Percent of redemption price to principal amount on redemption at any time prior to June 1, 2015               100.00%                                                    
Make-whole premium as percentage of principal amount of Notes subject to redemption               1.00%                                                    
Percent of principal amount of notes redeemable               35.00%                                                    
Percent of redemption price of the principal amount of the notes redeemed, plus accrued and unpaid interest               106.875%                                                    
Notional amount   350,000,000                                                                
Interest rate swap liability position   14,800,000                                                                
Accrued interest   3,100,000                                                                
Prepayment of debt                     165,800,000                                              
Prepayment to holders, make-whole amount and accrued and unpaid interest                     13,900,000                                              
Borrowings under revolving credit facility used to fund prepayment of 2004 Notes                     150,000,000                                              
Carrying amount of long-term debt 965,280,000 954,809,000                                                                
Maximum amount available under receivable securitization   50,000,000                                                                
Outstanding borrowings under accounts receivable securitization facility $ 4,700,000 $ 4,700,000                                                                
Convertible notes, conversion price based on 130% conversion ratio       $ 79.72