Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets - Additional Information (Detail)

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Intangible Assets - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Jun. 30, 2011
Schedule of Actual and Estimated Amortization Expense [Line Items]      
Intangible asset amortization expense $ 12,000,000 $ 24,221,000 $ 19,246,000
Estimated amortization expense, 2012 47,900,000 47,900,000  
Estimated amortization expense, 2013 46,300,000 46,300,000  
Estimated amortization expense, 2014 44,600,000 44,600,000  
Estimated amortization expense, 2015 42,800,000 42,800,000  
Estimated amortization expense, 2016 $ 41,100,000 $ 41,100,000