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Goodwill and Other Intangible Assets, Net - Amortization Expense for Existing Client Lists and Other Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]  
2014 $ 13,655
2015 12,311
2016 11,437
2017 10,765
2018 $ 10,031