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Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Finite-Lived Intangible Assets [Line Items]        
Finite lived intangible assets, amortization expense $ 3,000 $ 3,500 $ 6,019 $ 8,068
Estimated amortization expense during the remainder of 2015 5,800   5,800  
Estimated amortization expense for the year 2016 10,600   10,600  
Estimated amortization expense for the year 2017 9,800   9,800  
Estimated amortization expense for the year 2018 8,200   8,200  
Estimated amortization expense for the year 2019 7,600   7,600  
Estimated amortization expense for the year 2020 7,400   7,400  
Estimated amortization expense after the year 2020 $ 15,400   $ 15,400