v2.4.0.8
Intangible Assets - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Business Acquisition [Line Items]        
Amortization Expense $ 25,100,000 $ 24,800,000 $ 76,909,000 $ 69,275,000
Expected amortization of intangibles, 2014 102,200,000   102,200,000  
Expected amortization of intangibles, 2015 95,900,000   95,900,000  
Expected amortization of intangibles, 2016 85,600,000   85,600,000  
Expected amortization of intangibles, 2017 46,500,000   46,500,000  
Expected amortization of intangibles, 2018 $ 46,500,000   $ 46,500,000  
Intangible assets expected to amortize over a weighted-average period     7 years