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Long-Term Debt - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Long-term Debt $ 2,075,703 $ 2,238,935
Funded debt to consolidated EBIDTA ratio 3.50  
Ratio of consolidated EBIT to consolidated interest expense 2.75  
Term Loan Facility
    
Debt Instrument [Line Items]    
Long-term Debt 790,000 [1] 800,000 [1]
Term Loan Facility | LIBOR | Minimum
    
Debt Instrument [Line Items]    
Margin rate on loans 1.375%  
Term Loan Facility | LIBOR | Maximum
    
Debt Instrument [Line Items]    
Margin rate on loans 2.50%  
Term Loan Facility | Base Rate Loans | Minimum
    
Debt Instrument [Line Items]    
Margin rate on loans 0.375%  
Term Loan Facility | Base Rate Loans | Maximum
    
Debt Instrument [Line Items]    
Margin rate on loans 1.50%  
Term Loan Facility | Amended Agreement | LIBOR | Minimum
    
Debt Instrument [Line Items]    
Margin rate on loans 1.375%  
Term Loan Facility | Amended Agreement | LIBOR | Maximum
    
Debt Instrument [Line Items]    
Margin rate on loans 2.375%  
Term Loan Facility | Amended Agreement | Base Rate Loans | Minimum
    
Debt Instrument [Line Items]    
Margin rate on loans 0.375%  
Term Loan Facility | Amended Agreement | Base Rate Loans | Maximum
    
Debt Instrument [Line Items]    
Margin rate on loans 1.375%  
Second Amended And Restated Credit Agreement
    
Debt Instrument [Line Items]    
Maturity date May 04, 2018  
Credit Facility 1,200,000  
Maximum amount of increase in Commitments under the revolving credit facility 1,500,000  
Second Amended And Restated Credit Agreement | LIBOR | Minimum
    
Debt Instrument [Line Items]    
Margin rate on loans 1.125%  
Second Amended And Restated Credit Agreement | LIBOR | Maximum
    
Debt Instrument [Line Items]    
Margin rate on loans 1.75%  
Second Amended And Restated Credit Agreement | Base Rate Loans | Minimum
    
Debt Instrument [Line Items]    
Margin rate on loans 0.125%  
Second Amended And Restated Credit Agreement | Base Rate Loans | Maximum
    
Debt Instrument [Line Items]    
Margin rate on loans 0.75%  
Second Amended And Restated Credit Agreement | Sub Limit Swing Line Loans
    
Debt Instrument [Line Items]    
Credit Facility 25,000  
Previous Credit Facility
    
Debt Instrument [Line Items]    
Long-term Debt $ 680,000  
Revolving credit facility maturing 2016-07  
[1] Interest rates in the table above represent the range of interest rates incurred during the six month period ended June 30, 2013.