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Goodwill and Intangible Assets Goodwill and Intangible Assets (detail) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Line Items]      
Amortization of Intangible Assets $ 5,245 $ 5,522 $ 6,145