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Credit Arrangements - Additional Information (Detail) (USD $)
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2013
Jun. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Feb. 29, 2012
Debt Disclosure [Line Items]          
Cash paid $ 308,900,000        
Term loan amount   2,000,000,000 2,000,000,000 2,400,000,000 300,000,000
Pay down indebtedness under senior secured credit facilities         50,000,000
Loss on extinguishment of debt   16,543,000 16,543,000    
Unamortized debt issuance cost   5,600,000 5,600,000    
Unamortized discount   4,800,000 4,800,000    
Unamortization related fees and expenses   $ 6,100,000 $ 6,100,000