Goodwill and Other Intangible Assets - Schedule of Estimated Amortization Expense for Other Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]  
2015 $ 12,537
2016 12,113
2017 11,326
2018 11,207
2019 $ 8,576