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Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Finite-Lived Intangible Assets [Line Items]        
Finite lived intangible assets, amortization expense $ 3,398,000 $ 5,776,000 $ 11,466,000 $ 17,293,000
Estimated amortization expense during the remainder of 2014 3,200,000   3,200,000  
Estimated amortization expense for the year 2015 11,900,000   11,900,000  
Estimated amortization expense for the year 2016 10,700,000   10,700,000  
Estimated amortization expense for the year 2017 10,000,000   10,000,000  
Estimated amortization expense for the year 2018 8,400,000   8,400,000  
Estimated amortization expense for the year 2019 7,700,000   7,700,000  
Estimated amortization expense after the year 2019 $ 23,400,000   $ 23,400,000